Abstract

The empirical prediction on the phase formation in as-cast (CuFeMnNi)_1−xCr_x alloys was consistent with the previous experimental results, which indicated that the BCC phase formed in the alloys was in the thermodynamically unstable state. The corrosion resistance of the alloys in 2 wt% HNO₃ solution was increased with the increased Cr content which was mainly related to the formation of large anode and small cathode, increasing total volume fraction of Cr-rich FCC1 and BCC phases, the more uniform distribution of Cu and decreasing relative Cu content. The (CuFeMnNi)_0.75Cr_0.25 alloy exhibited an excellent corrosion resistance dominated by localized corrosion, while the CuFeMnNi alloy showed the worst corrosion resistance. Moreover, the strength of the investigated alloys increased while the ductility decreased with the increasing of Cr content, revealing that the extrinsic features played a more important role in the fracture behavior than the intrinsic features.

Graphic Abstract

中文翻译：

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硝酸溶液中的腐蚀行为和（CuFeNiMn）1-x Cr x HEAs的拉伸性能

摘要

铸态（CuFeMnNi）_1-x Cr _x合金中相形成的经验预测与先前的实验结果一致，这表明合金中形成的BCC相处于热力学不稳定状态。合金在2 wt％HNO ₃溶液中的耐蚀性随Cr含量的增加而增加，这主要与大阳极和小阴极的形成，富铬FCC1和BCC相的总体积分数增加，更均匀有关。分布和降低相对铜含量。（CuFeMnNi）_0.75铬_0.25合金表现出优异的耐腐蚀性，以局部腐蚀为主，而铜铁锰镍合金则表现出最差的耐腐蚀性。而且，随着Cr含量的增加，所研究合金的强度增加，而延展性下降，这表明外在特征比内在特征对断裂行为的影响更大。

图形摘要