2006年, 第16卷, 第01期　刊出日期：2006-01-25

  

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  中国有色金属学报（英文版）. 2006, 16(01): 1-1.

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  Cycling stability of La-Mg-Ni-Co type hydride
  electrode with Al

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  中国有色金属学报（英文版）. 2006, 16(01): 8-8.

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  Induction plasma spheroidization of tungsten
  and molybdenum powders

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  中国有色金属学报（英文版）. 2006, 16(01): 9-9.

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  The melting, evaporation and oxidation behaviors as well as the solidification phenomena of tungsten and molybdenum in induction plasma were studied. Scanning electron microscopy was used to examine the morphology and the cross section of plasma-processed powders. X-ray diffraction was used to analyze the oxides formed on the particle surface of these two metals. The influence of spray chamber pressure on the spheroidization and oxidation phenomena was discussed. The results show that fewer Mo particles than W particles are spheroidized at the same powder feed rate under the same plasma spray condition although molybdenum has a lower melting point. A small fraction of tungsten is evaporized and condensed either on the surface of tungsten particles nearby or on the wall of spray chamber. Tungsten oxides were found in tungsten powder processed under soft vacuum condition. Extremely large grains form inside some spheroidized particles of tungsten powder.
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  Influence of interfacial reaction between molten
  SnAgCu solder droplet and
  Au/Ni/Cu pad on IMC evolution

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  中国有色金属学报（英文版）. 2006, 16(01): 18-18.

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  Intermetallic compounds(IMC) formed at Sn-Ag-Cu solder droplet/pad interface during wetting reaction were investigated. Comparative studies of the IMC evolution during reflow and aging were also conducted. The results show that the wetting reaction between molten solder droplet and pad leads to the formation of Au-Sn compound at interface, but Au element is not fully consumed during wetting reaction. After reflow, all Au layer disappears from the interface, Au element is dissolved into solder and Au-Sn intermetallic compounds are precipitated in the bulk. Reaction between Ni layer and Sn-Ag-Cu solder leads to the formation of (Cu_xNi_1-x)₆Sn₅ layer at interface during reflow. According to the thermodynamic-kinetic of interfacial reaction, the wetting reaction at solder droplet/pad interface influences the phase selectivity of IMC evolution during reflow and aging process.
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  First-principles study on structural stability of 3d
  transition metal alloying magnesium hydride

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  中国有色金属学报（英文版）. 2006, 16(01): 23-23.

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  A first-principles plane-wave pseudopotential method based on the density functional theory was used to investigate the energy and electronic structure of magnesium hydride (MgH₂) alloyed by 3d transition metal elements. Through calculations of the negative heat formation of magnesium hydride alloyed by X (X denotes 3d transition metal) element, it is found that when a little X (not including Sc) dissolves into magnesium hydride, the structural stability of alloying systems decreases, which indicates that the dehydrogenation properties of MgH₂ can be improved. After comparing the densities of states(DOS) and the charge distribution of MgH₂ with or without X alloying, it is found that the improvement for the dehydrogenation properties of MgH₂ alloyed by X attributes to the fact that the weakened bonding between magnesium and hydrogen is caused by the stronger interactions between X (not including Cu) and hydrogen. The calculation results of the improvement for the dehydrogenation properties of MgH₂－X (X=Ti, V, Mn, Fe, Co, Ni, Cu) systems are in agreement with the experimental results. Hence, the dehydrogenation properties of MgH₂ are expected to be improved by addition of Cr, Zn alloying elements.
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  Continuous electromagnetic separation of inclusion from
  aluminum melt using alternating current

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  中国有色金属学报（英文版）. 2006, 16(01): 33-33.

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  A novel scheme about the continuous electromagnetic purification of aluminum melt was put forward based on the utilization of a square separation pipe and a 50 Hz alternating current to produce electromagnetic force. It is experimentally found that with electrical current of 400 A/cm², it takes only 10 s to remove 95% inclusion from aluminum melt. Comprehensive numerical simulations were carried out to investigate the dynamics mechanisms behind the process. The results show that the removal of inclusion is attributed to the cooperative effects of electromagnetic buoyancy and the secondary flow induced by the rotational electromagnetic force, and the removal efficient increases with the size of inclusion and the electrical current imposed. Theoretical predictions on the distribution and removal efficiency of inclusion were supported by the experiments.
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  Phase selection in highly undercooled Fe-B eutectic alloy melts

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  中国有色金属学报（英文版）. 2006, 16(01): 39-39.

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  The high undercooling technique by molten glass slag purification and cyclical superheating in Ar atmosphere was applied to bulk Fe-B alloy melts. A hypercooling was achieved which suppressed the formation of stable phase and consequently promoted the nucleation of metastable phase. Fe-17%B and Fe-20%B alloys were investigated, respectively. TEM and X-ray powder diffraction analyses verify the formation of metastable phase in the highly undercooled Fe-B alloy melts. Besides, the critical nucleation work of Fe₂B and Fe₃B phases was calculated to predict phase selection in the undercooled melts. The results show that the metastable phase formation is a function of the undercooling achieved prior to nucleation. And the amount of undercooling is an important factor in determining microstructural development by controlling phase selection in the undercooled melts.
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  Thermal stability and curing kinetics of polycarbosilane fibers

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  中国有色金属学报（英文版）. 2006, 16(01): 44-44.

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  Thermal stability and curing kinetics of polycarbosilane (PCS) fibers were studied by thermogravimetry (TG), Fourier transform infrared spectroscopy(FT-IR). Curing is an essential step in the preparation of SiC fibers and the properties of SiC fibers are affected greatly by curing conditions. TG measurement performed in air shows that mass gain starts at approximately 200<SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-ascii-font-family:
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  Effects of heat treatment on characteristics of porous
  Ni-rich NiTi SMA prepared by SHS technique

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  中国有色金属学报（英文版）. 2006, 16(01): 49-49.

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  The effects of heat treatment on the microstructure and compressive properties of porous Ni-rich NiTi shape memory alloy (SMA) fabricated by self-propagating high-temperature synthesis (SHS) were investigated. The solution treatment at 1050℃ has little effects on stable Ti₂Ni second phase, however, it decreases the amount of Ni₄Ti₃ phase derived from the SHS process and results in the improvement of the ductility of porous NiTi SMA. The subsequent aging treatment after solution treatment could lead to the precipitation of the discrete Ni₄Ti₃ phase in NiTi matrix grains, which increases the brittleness of porous NiTi SMA. Porous NiTi SMA presents a composite fracture behavior consisting of a ductile fracture of NiTi matrix and a cleavage fracture of second phase particles. Many cracks existing on the interfaces indicate that the bonding of the matrix with second phase particles is weak.
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  Influence of nitrogen doping on thermal stability
  of fluorinated amorphous carbon thin films

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  中国有色金属学报（英文版）. 2006, 16(01): 54-54.

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  Nitrogen doping fluorinated amorphous carbon (a-C<SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family:
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  Effects of cooling rates on microstructure and
  microhardness of lead-free Sn-3.5%Ag solders

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  中国有色金属学报（英文版）. 2006, 16(01): 59-59.

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  Numerical simulation of warm compacted synchronous pulley

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  中国有色金属学报（英文版）. 2006, 16(01): 65-65.

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   A new mechanical model for warm powder compaction was presented. Warm compaction process of iron-based powder was investigated to deal with the existence of elastic, plastic and thermal strains. A coupled mechanical and thermal model was developed based on ellipsoidal yield criterion and continuum theory. The constitutive equations were integrated into the constitutive integral arithmetic and solved employing incremental iterative solution strategy. The flow stress model of iron powder was nonlinearly fitted according to uniaxial warm compaction. The constitutive model was implemented into user-subroutines of MSC.Marc. With the equations, algorithms and programs developed, the compaction procedures of a complex synchronous pulley were simulated. Two different compaction schemes with different punch displacements were tested and the relative density distribution was obtained. Comparison with experimental data shows that the homogeneity of green compact is greatly affected by the compaction mode. The simulation results agree with the experiments very well.
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  Effect of pouring temperature on semi-solid slurry of
  A356 Al alloy prepared by weak electromagnetic stirring

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  中国有色金属学报（英文版）. 2006, 16(01): 71-71.

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   The semi-solid slurry of A356 Al alloy was manufactured by low superheat pouring and weak electromagnetic stirring. The effects of pouring temperature on the slurry manufactured by weak electromagnetic stirring were researched. The results indicate that it is feasible to manufacture the slurry with particle-like primary phases by low superheat pouring and weak electromagnetic stirring, and there is an important effect of the pouring temperature (superheat temperature) on the morphology and the size of primary<SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family:
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  Kinetics and mechanism of interfacial reaction in
  SCS-6 SiC continuous fiber-reinforced Ti-Al intermetallic matrix composites

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  中国有色金属学报（英文版）. 2006, 16(01): 77-77.

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  SCS-6 SiC continuous fiber-reinforced Ti-Al intermetallics-matrix composites were fabricated by HIP method and then heat-treated in vacuum under different conditions. The interfacial reaction kinetics and mechanism were studied by using SEM, EDS and XRD. The results show that the content fluctuation of reactive elements such as C, Ti and Si appears in interfacial reaction layers, and multi-layer interfacial reaction compounds form. Alloying element Nb in matrix remarkably diffuses into interfacial reaction zone and changes the activation energy for the interfacial reaction layer growth following a role of parabolic rate. The activation energy (Q^k) and (k₀) of SCS-6 SiC/super α₂ and SCS-6 SiC/Ti₂AlNb are 317.664 kJ/mol, 175.709 kJ/mol and 5.4438×10^－2 m/s^1/2, 1.44×10^－5 m/s^1/2; respectively, and the diffusion coefficient (D_C) is about 10^－18—10^－20 m²/s. It is confirmed that the SCS-6 SiC/Ti-Al intermetallic composites have higher interface compatibility and stability. Furthermore, compared with SCS-6 SiC/super α₂, the interface compatibility and stability of SCS-6 SiC/Ti₂AlNb are even higher.
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  Key factors for warm rolled bond of 6111-aluminium strip

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  中国有色金属学报（英文版）. 2006, 16(01): 84-84.

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  Based on rolling tests and simulation, the bond behavior and its mechanism of 6111-aluminum alloy commonly used in auto industry were studied. As main factors, the effects of different heating stratagem, rolling speed and reduction on bond were tested. The effect of rolling speed on bond was produced by the synthetical result of contact time and temperature of rolling zone. Higher speed creates higher temperature of rolling zone but decreases contact time of interfaces, and bond strength decreases accordingly. The bond strength increases along with the increase of entry temperature before a turning point, after the turning point bond strength changes gently. Cold rolling is hard to get a satisfying bond result although the rolling parameters are adjusted, while warm bond reaches a higher strength that is comparable to the parent material. The analysis of surfaces separated by shear test shows that for warm bonding the rolling texture disappears on the bond area but the scratch track remain on the bond area for cold bond. There is no gap at the position of interface for well-bond sample. The results of this study are helpful to create well-bond materials for auto industry.

   
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  Simulation of interphase boundary of Ni75AlxV25-x alloys
  using microscopic phase-field method

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  中国有色金属学报（英文版）. 2006, 16(01): 91-91.

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  The evolution of ordered interphase boundary (IPB) of Ni₇₅Al_xV_25-x alloys was simulated using the microscopic phase-field method. Based on the atomic occupation probability figure on 2D and order parameters, it was found that the IPB formed by different directions ofθ phase has great effect on the precipitation of phase. The  phase precipitated at the IPB that is formed by  direction where the  plane is opposite, and then grows up and the shape is strap at final. The IPB structure between phase andθ phase is the same. There is no  phase precipitate at the IPB where the  and  planes are opposite, the ordered IPB is dissolved into disordered area. There is  phase precipitation at the IPB formed by the  and  directions, and the IPB structure is different between  phase and the different directions ofθ phase. The IPB where  and  plane opposite does not migrate during the  phase growth, and  phase grows along direction.
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  Aging microstructural characteristics of ZA-27 alloy and
  SiCp/ZA-27 composite

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  中国有色金属学报（英文版）. 2006, 16(01): 98-98.

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  The aging characteristics of as-quenched microstructures of ZA-27 alloy and SiC_p/ZA-27 composite(ZMC_p) were investigated using SEM, EDS and TEM. The structure, morphology and size of sub-grains in primary dendrite in ZMC_p continuously change during aging process. Little tiny spherical Zn-rich η phase distributes in the dendrite. Amount of transitional α′phase, well coherent with equilibrium α_f phase, in SiC_p-neighboring dendrite edge zone is less than that in dendrite center zone. Both eutectic and peritectic β phase transform into lamellar α and η phases, obeying _η∥[110]_α, and (002)_α∥ _η. In the like-eutecticum of ZMC_p, less amount of β phase and decomposition products are found. The size of α phase decomposed from peritectic β phase in ZMC_p is obviously larger than that in the monolithic alloy. The lamella decomposition of β phase beside SiC_p is evidently more rapid than that in the alloy. SiC particulates strongly accelerate neighboring β phase decomposition in aging process.
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  Synthesis of single crystalline CdS nanowires with
  polyethylene glycol 400 as inducing template

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  中国有色金属学报（英文版）. 2006, 16(01): 105-105.

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  Solvothermal technique, an one-step soft solution-processing route was successfully employed to synthesize single crystalline CdS nanowires in ethylenediamine medium at lower temperature (170 ℃) for 1<SPAN style="FONT-SIZE: 9pt; FONT-STYLE: normal; FONT-FAMILY: 宋体; mso-bidi-font-size: 14.0pt; mso-ascii-font-family:
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  Solidification crack susceptibility of aluminum alloy weld metals

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  中国有色金属学报（英文版）. 2006, 16(01): 110-110.

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  The susceptibilities of the three aluminum alloys to solidification crack were studied with trans-varestraint tests and tensile tests at elevated temperature. Their metallurgical characteristics, morphologies of the fractured surface and dynamic cracking behaviors at elevated temperature were analyzed with a series of micro-analysis methods. The results show that dynamic cracking models can be classified into three types. The first model has the healing effect which is called type A. The second is the one with deformation and breaking down of metal bridge, called type B. The last one is with the separation of liquid film along grain boundary, called type C. Moreover, the strain rate has different effects on crack susceptibility of aluminum alloys with different cracking models. ZL101 and 5083 alloys belong to type A and type C cracking model respectively, in which strain rate has greater effect on eutectic healing and plastic deformation of metal bridge. 6082 alloy is type B cracking model in which the strain rate has little effect on the deformation ability of the liquid film.
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  Additional transition induced by magnetoelectric interaction in
  ferroelectromagnet Pb(Fe1/2Nb1/2)O3

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  中国有色金属学报（英文版）. 2006, 16(01): 117-117.

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  Besides the two phase transitions known in ferroelectromagnets, an additional transition was observed experimentally in Pb(Fe_1/2Nb_1/2)O₃ and the possible mechanism was explored. The magnetic moment shows that anomalous increases when the temperature goes down away from the Néel temperature of 20<SPAN style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-ascii-font-family:
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  Influence of annealing treatment on structural and magnetic
  properties of double perovskite Sr2FeMoO6

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  中国有色金属学报（英文版）. 2006, 16(01): 122-122.

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  The structure, magnetic and electric properties of Sr₂FeMoO₆ (the as-made sample) and samples after heat treatment were investigated. The nuclear and magnetic structures of the samples were studied using neutron powder diffraction at room temperature. The results show that the tunneling magnetoresistance of polycrystalline Sr₂FeMoO₆ depends on its annealing temperature. Annealing at 800 ℃ makes the minimal magnetoresistance(MR) elevated, which may be due to the change of the grain size or the modified intergranular connections. Because of the impurity phase of Fe which probably affects the magnetotransport properties is much larger in sample C, so the MR is decreased by postannealing at 1100 ℃. Therefore, further enhancement of the tunneling magnetoresistance (TMR) can be realized by regulating the grain size at appropriate annealing temperature.
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  Electrochemical behavior and morphology of
  LiB compound anode materials

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  中国有色金属学报（英文版）. 2006, 16(01): 127-127.

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  Electrochemical behavior of LiB compound in LiPF₆-DMC/EMC/EC was studied. And morphology of the compound was investigated by SEM. The results show that there are three discharge potential plateaus for the LiB compound, corresponding to 0.46, 0.69 and 0.8 V (vs Li⁺/Li) respectively, its total discharge specific capacity is up to 660 mA·h/g, only first two potential plateau can be charged, its specific capacity is 274 mA·h/g. After discharging, the morphology of the Li compound is still fibrous shape.
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  Discussion and prediction on decreasing flow stress scale effect

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  中国有色金属学报（英文版）. 2006, 16(01): 132-132.

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  Based on crystal plasticity theory and surface layer model, relation of flow stress to billet dimension and grain size was built, and rationality of derived relation was verified with tensile tests of different size billets. With derived expressions, relation of decreasing flow stress scale effect to billet dimension, grain size as well as billet shape was discussed and predicted. The results show that flow stress is proportional to billet size; with decrease of grain size, flow stress is less influenced by billet dimension. When both cross section area and grain size are same, flow stress decrease of rectangular section billet or sheet is larger than that of circular section billet.

   
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  Characteristics and electrochemical performance
  of cathode material Co-coated LiNiO2 for Li-ion batteries

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  中国有色金属学报（英文版）. 2006, 16(01): 137-137.

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  Spherical Ni(OH)₂ powder coated with Co(OH)₂ as raw material was mixed with LiOH to synthesize cathode material for lithium ion battery by using solid-state reaction. After sintered at temperature above 600 <SPAN style="FONT-WEIGHT: normal; FONT-FAMILY: 宋体; mso-ascii-font-family:

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  Steady polarization process modelling of noble
  metal-electrolyte cermet composite electrode

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  中国有色金属学报（英文版）. 2006, 16(01): 142-142.

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  Cermet composites containing mixture of noble metal phase and electrolyte phase are the state-of-the-art electrode materials used for electrochemical sensor and solid oxide fuel cell(SOFC). A steady polarization model was developed. The model was based on electronic and ionic transfer process together with the electrochemical reaction regardless of mass transport in the electrode. The modelling results can help to understand the electrochemistry of cermet composite electrode.
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  New inverse method for identification of constitutive parameters

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  中国有色金属学报（英文版）. 2006, 16(01): 148-152.

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  Analysis of damage localization for ductile metal

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  中国有色金属学报（英文版）. 2006, 16(01): 153-158.

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  Effects of heat treatment on dynamic compressive properties and energy absorption characteristics of open-cell aluminum alloy foams

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  中国有色金属学报（英文版）. 2006, 16(01): 159-163.

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  Thermal expansion anomaly and magnetic properties of

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  中国有色金属学报（英文版）. 2006, 16(01): 164-167.

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  Growth mechanism of Cu nanopowders prepared by anodic arc plasma

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  中国有色金属学报（英文版）. 2006, 16(01): 168-172.

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  Preparation of nanometer δ- and β-bismuth trioxide by

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  中国有色金属学报（英文版）. 2006, 16(01): 173-177.

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  Axial mixing and mass transfer characteristics of pulsed extraction column with discs and doughnuts

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  中国有色金属学报（英文版）. 2006, 16(01): 178-184.

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  Effects of impeller speed and aeration rate on

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  中国有色金属学报（英文版）. 2006, 16(01): 185-190.

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  Bond population analysis on combination of

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  中国有色金属学报（英文版）. 2006, 16(01): 191-197.

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  Observation of fine particle aggregating behavior induced by high intensity

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  中国有色金属学报（英文版）. 2006, 16(01): 198-202.

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  Thermodynamics and technology of extracting gold from low-grade

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  中国有色金属学报（英文版）. 2006, 16(01): 203-208.

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  In-situ monitoring of nickel electrodeposit structure using

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  中国有色金属学报（英文版）. 2006, 16(01): 209-209.

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  Electro-catalytic effect of manganese oxide on oxygen reduction at

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  中国有色金属学报（英文版）. 2006, 16(01): 217-222.

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  Process of electroless plating Cu-Sn-Zn ternary alloy

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  中国有色金属学报（英文版）. 2006, 16(01): 223-228.

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  Corrosion behavior of CuCrNiAl alloy in HCl solutions

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  中国有色金属学报（英文版）. 2006, 16(01): 229-233.

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