Ni-Ga二元系的热力学计算

Thermodynamic Assessment of the Ni-Ga System

采用 ＣＡＬＰＨＡＤ技术评估了Ｎｉ－Ｇａ二元系的相图和热力学性质．用双亚晶格模型描 述２个有序相（Ｌ１２－Ｎｉ３Ｇａ和Ｂ２－ＮｉＧａ）的热力学行为，并在优化过程中考虑了ｆｃｃ－（Ｎｉ）和Ｌ１２Ｎｉ３Ｇａ 相的有序－无序转变．溶液相（液相、ｆｃｃ－（Ｎｉ）固溶体）的热力学模型采用Ｒｅｄｌｉｃｈ－Ｋｉｓｔｅｒ方程，其 余５个中间化合物被视为整比化合物．

The Ni-Ga system was assessed using the CALPHAD technique. The thermodynamic behav-iour of the ordered phases (Li 2-Ni3Ga and H2-NiGa) were described by the sub-lattice model, and the order-disorder transformation of fcc-(Ni) and Li2-Ni3Ga phase was considered in the assessment. The solution phases (liquid, fcc-Ni) were modeled with the Redlich-Kister equation. The other 5 intermetallic compounds were treated as stoichiometric phases.