Cr含量对铸态和热处理后AlCrxCuFeNi高熵合金微观组织和硬度的影响

doi:10.13251/j.issn.0254-6051.2024.10.039

摘要/Abstract

摘要： 采用电弧熔炼工艺制备了AlCr_xCuFeNi(x=0, 1.0, 2.0)高熵合金(记为Cr₀、Cr_1.0和Cr_2.0合金),研究了Cr含量对高熵合金铸态和600 ℃热处理后的微观组织和显微硬度的影响。结果表明,铸态条件下,Cr₀合金的物相结构主要由富Fe、Ni的FCC固溶体相和AlCu₃相组成,而Cr_1.0和Cr_2.0合金均由富Cu的FCC2相、富Cr、Fe的BCC相和AlNi相组成。600 ℃热处理后,高熵合金的物相结构基本未发生改变,具有良好的物相稳定性,且合金的元素偏析程度显著改善。Cr₀合金铸态显微硬度为348 HV10,600 ℃热处理后略增至370 HV10。随Cr含量提高,高熵合金的硬度随之增加,其中Cr_2.0合金铸态和600 ℃热处理后的显微硬度最高,分别达到435和462 HV10。热处理后合金硬度增加主要与固溶强化、析出强化和细晶强化机制有关。

关键词: Cr含量, 高熵合金, 热处理, 微观组织, 显微硬度

Abstract: AlCr_xCuFeNi (x=0, 1.0, 2.0) high-entropy alloys, which named as Cr₀, Cr_1.0 and Cr_2.0, was prepared by using arc melting technology. The effect of Cr content on microstructure and microhardness of the as-cast high-entropy alloys and after heat treatment at 600 ℃ was studied. The results indicate that the phase structure of the as-cast Cr₀ alloy is mainly composed of (Fe, Ni)-rich FCC solid solution phase and AlCu₃ phase, while both Cr_1.0 and Cr_2.0 alloys are composed of Cu-rich FCC2 phase, (Cr, Fe)-rich BCC phase and AlNi phase. After heat treatment at 600 ℃, the phase structure of the alloy remains largely unchanged, indicating good phase stability, meanwhile, the element segregation degree of the high-entropy alloy is significantly improved. The microhardness of the as-cast Cr₀ alloy is 348 HV10, which slightly increases to 370 HV10 after heat treatment at 600 ℃. As the Cr content increases, the hardness of the high-entropy alloys also increases, and the microhardness of the as-cast Cr_2.0 alloy and after heat treatment at 600 ℃ is the highest, reaching 435 and 462 HV10, respectively. The increase in hardness of the high-entropy alloys after heat treatment is mainly related to the mechanisms of solid solution strengthening, precipitation strengthening and fine-grained strengthening.

Key words: Cr content, high-entropy alloy, heat treatment, microstructure, microhardness

中图分类号:

TG142.1

侯宏涛. Cr含量对铸态和热处理后AlCr_xCuFeNi高熵合金微观组织和硬度的影响[J]. 金属热处理, 2024, 49(10): 239-245.

Hou Hongtao. Effect of Cr content on microstructure and hardness of as-cast and heat treated AlCr_xCuFeNi high-entropy alloys[J]. Heat Treatment of Metals, 2024, 49(10): 239-245.

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