Liquid Metal Embrittlement of a Dual-Phase Al 0.7CoCrFeNi High-Entropy Alloy Exposed to Oxygen-Saturated Lead-Bismuth Eutectic
Liquid Metal Embrittlement of a Dual-Phase Al 0.7CoCrFeNi High-Entropy Alloy Exposed to Oxygen-Saturated Lead-Bismuth Eutectic
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DOI：
10.2139/ssrn.3711237
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Xing Gong;Congying Xiang;T. Auger;Jiajun Chen;Xiaocong Liang;Zhiyang Yu;M. Short;M. Song;Yuan Yin
中科院分区：
文献类型：
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作者：
Xing Gong;Congying Xiang;T. Auger;Jiajun Chen;Xiaocong Liang;Zhiyang Yu;M. Short;M. Song;Yuan Yin
采用铅铋共晶（LBE）在350℃和500℃下对双相Al0.7CoCrFeNi（等摩尔分数）高熵合金（HEA）进行脆化处理，建立了一种新的液相金属脆化体系。在350℃时，富含（Ni, Al）的BCC相发生脆化，导致该相发生晶内开裂，而在500℃时，主要的开裂方式变为BCC/FCC相边界脱粘。在这两个温度下，富（Co, Cr, Fe）的FCC相很少出现裂纹，表明该相不受LME的影响。此外，结果表明，在350°C时，以吸附为主的LME机制转变为500°C时以相边界润湿为主的LME机制。
Abstract This paper reports a new liquid metal embrittlement (LME) system in which a dual-phase Al0.7CoCrFeNi (equimolar fraction) high-entropy alloy (HEA) is embrittled by lead-bismuth eutectic (LBE) at 350 and 500°C. At 350°C, (Ni, Al)-rich BCC phase is embrittled, leading to intragrain cracking within this phase, while the predominant cracking mode changes to BCC/FCC phase boundary decohesion at 500°C. At both temperatures, cracks are rarely seen in the (Co, Cr, Fe)-rich FCC phase, indicating that this phase is immune to LME. Furthermore, the results suggest a transition from an adsorption-dominated LME mechanism at 350°C to a phase boundary wetting-dominated LME mechanism at 500°C.