Phase Equilibria in Ni-Rich Portion of Ni-Si System
Phase Equilibria in Ni-Rich Portion of Ni-Si System
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DOI：
10.2320/matertrans.mb200702
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发表时间：
2007-09
影响因子：
1.2
通讯作者：
K. Oikawa;R. Saito;K. Kobayashi;J. Yaokawa;K. Anzai
中科院分区：
文献类型：
--
作者：
K. Oikawa;R. Saito;K. Kobayashi;J. Yaokawa;K. Anzai
研究了Ni-Si系富镍部分的相平衡。用扩散偶方法确定了液态相与面心立方相之间的相界面，并通过两相合金的扫描电子显微镜-能谱分析确定了面心立方与�-1或�-2的相界面。本工作的相线与热分析所确定的实验数据符合得很好。固相线数据与以前的实验数据有较大差异，但与热力学计算的相图吻合。这一结果表明，目前的固相线和液相线数据与热力学数据是一致的。Si在面心立方相中的溶解度与前人的实验数据一致，但与热力学计算的相图不一致。这一事实表明，用CALPHAD方法对该体系进行热力学重新评估是必要的。[DOI：10.2320/MATERTRA.MB200702]
The phase equilibria of the Ni-rich portion in the Ni-Si system were investigated. The phase boundaries between liquid and fcc phases were established by the diffusion couple method and those of fcc and � 1 or � 2 were determined by the SEM-EDX measurement of two-phase alloys. The liquidus of the present work well agrees with the previous experimental data determined by a thermal analysis. The solidus data are rather different from the previous experimental data, but agree with the thermodynamic calculated phase diagram. This result suggests that the present solidus and liquidus data are consistent with thermodynamic data. The solubility of Si in the fcc phase agrees with some previous experimental data, but disagrees with the thermodynamic calculated phase diagram. This fact suggests that the thermodynamic reassessment for this system is necessary by the CALPHAD approach. [doi:10.2320/matertrans.MB200702]