Latent heats of fusion and crystallization behaviors of Co–Si binary alloys
Latent heats of fusion and crystallization behaviors of Co–Si binary alloys
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DOI：
10.1016/j.jallcom.2009.07.137
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发表时间：
2009-11
影响因子：
6.2
通讯作者：
W. Yao;N. Wang
中科院分区：
文献类型：
--
作者：
W. Yao;N. Wang
测定了多种成分的Co-Si合金熔化Δ的潜热。根据测量数据，计算了无量纲熵(α=ΔHM/TLr，Tlis液体温度和气体常数R)，预测了几种金属间化合物的晶化行为，并通过实验验证了它们的晶化行为。ΔHmin随Si含量的增加而增大。然而，这些值比用线性外推的Neumman-Kopp法则得到的值要低。由实验数据计算的α系数表明，Co2Si、CoSi和CoSi2应以非晶面方式生长，凝固后的显微组织观察证实了这一点。对于由Neumman-Kopp规则确定的α值，Co-Si金属间化合物应该是刻面的形态，这表明它们的ΔHm值应该在实验上测量。
The latent heats of fusion ΔHms of Co–Si alloys over a wide range of composition have been determined. Based on the measured data, the dimensionless entropy (α=ΔHm/TlR, Tlis liquid temperature and R is gas constant) was calculated and the crystallization behaviors, faceted or non-faceted crystal growth, of several intermetallic compounds were predicted and examined by experiments. ΔHmincreases with the Si content. However, the values are lower than those obtained via Neumman–Kopp rule with linear extrapolation. The α coefficients calculated by the experimental data reveal that the Co2Si, CoSi, and CoSi2, should grow in a non-faceted manner and it was proved by the microstructure observation after solidification. For α value determined by the Neumman–Kopp rule, Co–Si intermetallic compounds should be faceted morphology, indicating that their ΔHmshould be measured experimentally.