Intergranular precipitation-enhanced wetting and phase transformation in an Al0.4CoCrFeNi high-entropy alloy exposed to lead-bismuth eutectic

Intergranular precipitation-enhanced wetting and phase transformation in an Al0.4CoCrFeNi high-entropy alloy exposed to lead-bismuth eutectic
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暴露于铅铋共晶的 Al0.4CoCrFeNi 高熵合金中的晶间沉淀增强润湿和相变

DOI:
10.1016/j.corsci.2021.110038
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发表时间:
2022-03
期刊:
影响因子:
8.3
通讯作者:
Yuan Yin
Yuan Yin
中科院分区:
材料科学1区
文献类型:
--
作者:
Xing Gong;Thierry Auger;Wenjian Zhu;Huasheng Lei;Congying Xiang;Zhiyang Yu;Michael P. Short;Pei Wang;Yuan Yin

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在500 °C下暴露于贫氧(10−13-10−14wt%)液态铅铋共晶(LBE)500 h后,LBE在用富BCC(Ni,Al)晶间(IG)沉淀物网络修饰的FCC Al 0.4CoCrFeNi高熵合金(HEA)中的渗透深度比在没有IG沉淀物网络的单相FCC Al 0.3CoCrFeNi HEA中的渗透深度高一个数量级以上。这种耐腐蚀性的劣化归因于BCC/FCC相间边界(IB)的能量性质和所得IB润湿。LBE进入膜选择性地浸出位于那些低指数晶面的镍,导致从FCC到BCC结构的相变。
After exposure to oxygen-poor (10−13–10−14wt%) liquid lead-bismuth eutectic (LBE) at 500 °C for 500 h, LBE penetrates more than one order of magnitude deeper in an FCC Al0.4CoCrFeNi high-entropy alloy (HEA) decorated with a network of BCC (Ni, Al)-rich intergranular (IG) precipitates than in a single-phase, FCC Al0.3CoCrFeNi HEA without the IG precipitate network. This deterioration of corrosion resistance is attributed to the energetic nature of the BCC/FCC interphase boundaries (IBs) and resultant IB wetting. The LBE ingress film selectively leaches nickel located at those low-indexed crystalline planes, resulting in phase transformation from FCC to BCC structure.
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