Thermodynamic reassessment of Ni–Ga binary system
来源期刊：Rare Metals2015年第12期
论文作者：Zhan-Min Cao Xian Shi Wei Xie Ikuo Ohnuma Kiyohito Ishida Zhi-Yu Qiao
文章页码：864 - 872
摘 要：New experimental measurements of the phase diagram and the mixing enthalpy of liquid phase along with the previous experimental data were used in a reassessment of the Ni-Ga system.A set of self-consistent thermodynamic parameters of the Ni-Ga system is obtained using the calculation of phase diagram（CALPHAD） technique,and the available phase diagram and thermodynamic data are reproduced well within experimental error limits.Some noticeable improvements are obtained in the present work compared with the previous assessment:（1） the calculated Ga-rich liquidus is more reasonable;（2） Ni3Ga7 is adopted as the most Ga-rich compound rather than NiGa4;（3） the Ni5Ga3 phase is treated as the nonstoichiometric compound with consideration of its narrow homogeneity range;（4） the phase transformation between B81.5Ni3Ga2 and Ni13Ga9 is considered instead of treating them as Ni3Ga2 phase simply;（5） the latest experimental data of mixing enthalpy for the liquid phase are adopted.The present study can be used as a basis for the development of a thermodynamic database of the Ni-based semiconductor alloy systems.
Zhan-Min Cao1，Xian Shi1，Wei Xie1，Ikuo Ohnuma2，Kiyohito Ishida2，Zhi-Yu Qiao1
1. State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. Department of Materials Science, Graduate School of Engineering, Tohoku University
摘 要：New experimental measurements of the phase diagram and the mixing enthalpy of liquid phase along with the previous experimental data were used in a reassessment of the Ni-Ga system.A set of self-consistent thermodynamic parameters of the Ni-Ga system is obtained using the calculation of phase diagram（CALPHAD） technique,and the available phase diagram and thermodynamic data are reproduced well within experimental error limits.Some noticeable improvements are obtained in the present work compared with the previous assessment:（1） the calculated Ga-rich liquidus is more reasonable;（2） Ni3Ga7 is adopted as the most Ga-rich compound rather than NiGa4;（3） the Ni5Ga3 phase is treated as the nonstoichiometric compound with consideration of its narrow homogeneity range;（4） the phase transformation between B81.5Ni3Ga2 and Ni13Ga9 is considered instead of treating them as Ni3Ga2 phase simply;（5） the latest experimental data of mixing enthalpy for the liquid phase are adopted.The present study can be used as a basis for the development of a thermodynamic database of the Ni-based semiconductor alloy systems.
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