EFFECT OF MILLING INTENSITY ON STRUCTURAL CHANGES OF MIXED Al-Fe-Ni POWDERS IN MECHANICAL ALLOYING PROCESS
(School of Materials Science and Engineering,Harbin Institute of Technology, Harbin 150001)
Abstract: Mixed elemental aluminium, nickel and iron powders in the composition of Al-4.9 Fe-4.9Ni were mechanically alloyed under various milling intensities. The results showed that milling causes refinement of the microstructure. The powders with grain size(GS) of the nanometer order were produced after milling. The increasing of ball to powder weight ratio(BPR) and rotational velocity(RV) accelerates the refinement of the grain and the particle of iron and nickel in aluminium matrix, and an approximate formula has been put forward according to the experimental results to quantitatively describe the change of GSversusBPR and RV.
Key words: Al-Fe-Ni powder structural change milling intensity mechanical alloying