材料科学
微观结构
合金
真空电弧
电弧熔炼
冶金
沉积(地质)
相(物质)
激光器
分析化学(期刊)
化学工程
物理化学
光学
化学
有机化学
色谱法
古生物学
物理
阴极
沉积物
生物
工程类
作者
Xueli Ma,Dongqun Xin,Jijun Ye,Jingjie Guo,Hui Li
标识
DOI:10.1016/j.matlet.2022.132951
摘要
• Dual-phase Al 0.7 CoCrFeNi HEAs were fabricated by DLD and VAM. • BCC phase in VAM Al 0.7 showed basket-weave-like structure by spinodal decomposition. • DLD sample contained a higher content of FCC phase than the VAM sample. • The texture in BCC phase in DLD sample deviated from 〈0 0 1〉 orientation. Dual-phase (FCC + BCC) Al 0.7 CoCrFeNi high-entropy alloys were successfully fabricated by direct laser deposition (DLD) and vacuum arc melting (VAM). It has been found that there is a significant difference between the microstructures produced by the two methods. A hypoeutectic structure (primary FCC phase + lamellar FCC-BCC eutectic microstructure) was observed in the DLD sample, while BCC phase in the VAM sample displayed basket-weave-like structures by spinodal decomposition, which can be attributed to the different thermal gradients and cooling rates for the two processes. A higher percentage of FCC phase was found in the DLD sample (63 %), compared to the VAM sample (55 %). In both samples, FCC phase was rich in Fe, Co and Cr, whereas Al and Ni were segregated in BCC phase. Furthermore, chaotic grain orientations were observed in FCC phase in both samples. A strong 〈0 0 1〉 texture along the direction of solidification was formed in BCC phase in the VAM sample, while in the DLD sample the texture showed a deviation from 〈0 0 1〉 orientation because of the complex nature of the temperature field.
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