Alloy gene Gibbs energy partition function and equilibrium holographic network phase diagrams of AuCu3-type sublattice system
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
4. College of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;
5. School of Physical Physics and Electronics, Central South University, Changsha 410083, China;
6. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
2. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
4. College of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;
5. School of Physical Physics and Electronics, Central South University, Changsha 410083, China;
6. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
Abstract: Taking AuCu3-type sublattice system as an example, three discoveries have been presented: First, the third barrier hindering the progress in metal materials science is that researchers have got used to recognizing experimental phenomena of alloy phase transitions during extremely slow variation in temperature by equilibrium thinking mode and then taking erroneous knowledge of experimental phenomena as selected information for establishing Gibbs energy function and so-called equilibrium phase diagram. Second, the equilibrium holographic network phase diagrams of AuCu3-type sublattice system may be used to describe systematic correlativity of the composition-temperature-dependent alloy gene arranging structures and complete thermodynamic properties, and to be a standard for studying experimental subequilibrium order-disorder transition. Third, the equilibrium transition of each alloy is a homogeneous single-phase rather than a heterogeneous two-phase, and there exists a single-phase boundary curve without two-phase region of the ordered and disordered phases; the composition and temperature of the top point on the phase-boundary curve are far away from the ones of the critical point of the AuCu3 compound.
Key words: AuCu3 compound; AuCu3-type sublattice system; alloy gene Gibbs energy partition function; equilibrium holographic network phase diagram; systematic metal materials science