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Evolution of mechanical properties and corrosion resistance of Al0.6CoFeNiCr0.4 high-entropy alloys at different heat treatment temperature
Materials Chemistry and Physics ( IF 4.6 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matchemphys.2020.122700
Shuai Wang , Yuhong Zhao , Xiaotao Xu , Peng Cheng , Hua Hou

Abstract The non-equiatomic Al0.6CoFeNiCr0.4 HEA with dual FCC + BCC structure was fabricated by arc-melting under high-purity argon atmosphere, and the mechanical behavior and corrosion resistance of these HEAs with heat temperature range of 550 °C–850°Cfor 24 h were investigated. By increasing the ageing temperature, the crystalline phase of these HEAs transformed from FCC + disordered BCC to FCC + disordered BCC + order B2 phase, and then to FCC + order B2 phase.The spherical B2 was firstly observed in the aged- 650°CHEA, and disordered BCC disappeared in aged-850°CHEA. The ageing hardening occurred at aged-650 °C, because of the growth of disordered BCC phase (α-Fe) and precipitation of spherical B2 phase (AlNi). Additionally, it can be found that the proper spinodal decomposition of FCC phase (Fe–Cr) can optimize mechanical properties of alloys, while excessive spinodal decomposition will cause the negative effect. The aged-750°Cdisplay an excellent mechanical properties of high strength and compress ductility due to the presence of proper spinodal decomposition and spherical B2 phase precipitation. When these HEAs were immersed in the 3.5 wt% NaCl solution, the corrosion resistance of these HEAs are gradually decrease with the Volume fraction of B2 phase increase, suggesting that crystalline phases with higher amount of Al element are prone to be corroded by Cl-ion.

中文翻译:

不同热处理温度下Al0.6CoFeNiCr0.4高熵合金力学性能和耐腐蚀性能的演变

摘要 在高纯氩气氛下通过电弧熔化制备了具有双 FCC + BCC 结构的非等原子 Al0.6CoFeNiCr0.4 HEA,并在 550 °C–850 的加热温度范围内测试了这些 HEA 的力学行为和耐腐蚀性能。 ℃ 24 小时进行了研究。随着时效温度的升高,这些HEA的结晶相由FCC+无序BCC转变为FCC+无序BCC+有序B2相,然后再转变为FCC+有序B2相。在650°CHEA中首先观察到球形B2 ,无序 BCC 在 850°CHEA 中消失。由于无序 BCC 相 (α-Fe) 的生长和球形 B2 相 (AlNi) 的析出,时效硬化发生在 650 °C 时。此外,可以发现,适当的 FCC 相(Fe-Cr)的旋节线分解可以优化合金的力学性能,而过度的旋节线分解会产生负面影响。由于存在适当的旋节线分解和球形 B2 相沉淀,时效 750°C 显示出优异的高强度和压缩延展性机械性能。当这些 HEA 浸入 3.5 wt% NaCl 溶液中时,这些 HEA 的耐腐蚀性能随着 B2 相体积分数的增加而逐渐降低,这表明 Al 元素含量较高的晶相容易被 Cl-离子腐蚀。 . 由于存在适当的旋节线分解和球形 B2 相沉淀,时效 750°C 显示出优异的高强度和压缩延展性机械性能。当这些 HEA 浸入 3.5 wt% NaCl 溶液中时,这些 HEA 的耐腐蚀性能随着 B2 相体积分数的增加而逐渐降低,表明 Al 元素含量较高的晶相容易被 Cl-离子腐蚀。 . 由于存在适当的旋节线分解和球形 B2 相沉淀,时效 750°C 显示出优异的高强度和压缩延展性机械性能。当这些 HEA 浸入 3.5 wt% NaCl 溶液中时,这些 HEA 的耐腐蚀性能随着 B2 相体积分数的增加而逐渐降低,这表明 Al 元素含量较高的晶相容易被 Cl-离子腐蚀。 .
更新日期:2020-04-01
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