Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 12 No. 4 August 2002|
Re-optimization of Ni-Ta binary system
（Department of materials science and Engineering,
Central South University, Changsha 410083, China）
Abstract:Part of the phase boundaries of the solid phases in Ni-Ta system at 1223K, 1173K and 1123K were determined by the diffusion couple and EMPA methods. Based on the experiment data and the information from literatures, the phase equilibrium relationship and thermodynamic properties of the system were analyzed and a complete thermodynamic description were obtained. Apart from the intermetallic phase Ni-8Ta, All the inter-phases were treated with small homogeneity and the sub-lattice model was used to describe them. The calculated results reproduce the experiment information very well.
Key words: diffusion couple; EMPA; thermodynamics; optimization; phase diagram