In situ observation of solidification and subsequent evolution of Ni-Si eutectics

In situ observation of solidification and subsequent evolution of Ni-Si eutectics
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镍硅共晶凝固和后续演化的原位观察

DOI:
10.1016/j.scriptamat.2022.114513
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发表时间:
2022
期刊:
影响因子:
6
通讯作者:
Fujiwara Kozo
Fujiwara Kozo
中科院分区:
材料科学1区
文献类型:
--
作者:
Chuang Lu-Chung;Maeda Kensaku;Morito Haruhiko;Fujiwara Kozo

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在定向凝固过程中观察到了成分为Ni44Si56的Ni-Si合金的共晶生长。凝固界面后有明显的片层组织,表明NiSi和NiSi2两种金属间化合物相形成了规则的共晶。晶片间距约为9.8μm,生长速率为149.6μm S−1。冷却阶段相界迅速迁移,晶片显著增大,这表明凝固后测量的晶片间距可能不能准确地获得生长速率与晶片间距之间的关系。现场观察为获得Ni-Si共晶的准确共晶间距提供了一条很有希望的途径。
Eutectic growth of Ni-Si alloy with a composition of Ni44Si56was observedin situduring directional solidification. Lamellar structure was evident behind the solidifying interface, which indicates that the two intermetallic phases, NiSi and NiSi2, generated a regular eutectic. The lamellae spacing was approximately 9.8 μm at a growth rate of 149.6 μm s−1. The phase boundaries migrated rapidly during the cooling stage and the lamellae enlarged significantly, which suggests that the lamellae spacing measured after the solidification may not be accurate for obtaining the relationship between the growth rate and the lamellae spacing. Thein situobservation provides a promising way to obtain the exact eutectic spacing of Ni-Si eutectics.
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