热处理过程中γ′和δ相演化对高熵 CoCu0.5FeNiTa0.1 合金力学性能的影响

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-12 DOI:10.1016/j.jmrt.2024.09.092
Zhengyuan Yuan, Min Zhang, Zhunli Tan, Wenbo Yu
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引用次数: 0

摘要

为了同时提高 CoCu0.5FeNiTa0.1 高熵合金的机械强度和塑性,我们采用了热处理方法,并研究了含有 γ′、δ 和 γ 相的不同相的演变。在铸造合金中检测到两种不同的 γ′ 相,即富 Cu 相和富 Ta 相。在热处理过程中,Cu 从 γ′(富 Cu)向外扩散到 γ 基体、γ′(富 Ta)相和 δ 相。Cu 和 Ta 在 δ 相中的积累极大地促进了其生长。抗压屈服强度从 1040 兆帕增加到 1370 兆帕,极限抗压强度从 2020 兆帕增加到 2735 兆帕,抗压应变从 34% 增加到 50.2%,硬度从 3.854 GPa 增加到 4.315 GPa。延展性的大幅提高主要源于γ基体中γ′颗粒间距的增加、晶格畸变的减小以及δ相长宽比的减小。屈服强化机理主要来自固体强化和奥罗旺强化。
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The effect of γ′ and δ phases evolution on the mechanical properties of high-entropy CoCu0.5FeNiTa0.1 alloy during heat treatment

To simultaneously improve the mechanical strength and plasticity of the CoCu0.5FeNiTa0.1 high entropy alloy, we adopted the heat treatment and investigated the evolution of different phases containing γ′, δ and γ phases. Two different γ′ phases, the Cu-rich phase and the Ta-rich phase, were detected in the as-cast alloy. During heat treatment, Cu outwards diffused from γ′(Cu-rich) into γ matrix, γ′(Ta-rich) phase and δ phase. The accumulation of Cu and Ta into the δ phase strongly promoted its growth. One significant increase was measured in the compressive yield strength from 1040 MPa to 1370 MPa, ultimate compressive strength from 2020 MPa to 2735 MPa, compressive strain from 34% to 50.2% and hardness from 3.854 GPa to 4.315 GPa. The substantial enhancement in ductility mainly resulted from the distance increase among γ′ particles in γ matrix, the reduction of lattice distortion and the decrease in aspect ratio of δ phases. The yield strengthening mechanisms were mainly from solid strengthening and Orowan strengthening.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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