Zhaochun ZHANG
,
Hang SU
,
Nianyi CHEN
,
Ruiwu PENG
材料科学技术（英文）
In this paper, the NRTL equation approach has been used for calculating the activity coefficient and excess Gibbs free energy of the binary alloy system involving two-liquid coexisting phases. The parameters needed for the calculation are the differences of interaction energies (g12-g22), (g21-g11) and nonrandomness constant α, which are determined by solving NRTL equation with the aid of genetic algorithm. The calculation is carried out numerically for Al-In system. The agreement between the calculated and experimentally determined values of activity coefficient and excess Gibbs free energy is rather good, indicating the validity of the NRTL equation for the description of two-liquid coexisting phase alloy systems.
关键词:
Lixiu YAO
,
Jie YANG
,
Chenzhou YE
,
Nianyi CHEN
材料科学技术（英文）
Four parameters, phi (electronegativity), n(ws)(1/3) (valence electron density in Wagner-Seitz cell), R (Pauling's metallic radius) and Z (number of valence electrons in atom), and the pattern recognition methods were used to investigate the regularities of formation of ternary intermetallic compounds between three transition elements. The obtained mathematical model expressed by some inequalities can be used as a criterion of ternary compound formation in "unknown" phase diagrams of alloy systems.
关键词:
Lixiu YAO
,
Nianyi CHEN
,
Jie YANG
材料科学技术（英文）
The pattern recognition methods and a four-parameter model, Eased on extension of Miedema's cellular model of alloy phases, are used to study the regularities of formation of ternary compounds between one transition element (T) and two non-transition elements (N, N') (T-N-N' system). The influences of phi (electronegativity), n(ws)(1/3)(valence electron density in Wagner-Seitz cell), R(Pauling's metallic radii) and Z (number of valence electrons in atom) on the formation of the ternary intermetallic compounds were investigated.
关键词:
Jin GUO
,
Chonghe LI
,
Nianyi CHEN
材料科学技术（英文）
The discharge capacities for Ni-MH batteries with different electrode constitutions are analyzed by chemical pattern recognition method, and some criteria for improving synthetical discharge properties are obtained. The results show that the thickness of positive and negative electrode are significant in influencing the discharge capacities at both of low and high discharge current, the influence of resistance of positive electrode on discharge capacity is less significant compared with other factors in electrode constitution and the effect of electrolyte on discharge capacity at low discharge current is more significant than that at high discharge current.
关键词:
