The effect of the interaction between recrystallization and precipitation on the heterogeneous microstructure and tensile properties in a heavily cold–rolled Al0.3CoCrFeNi high–entropy alloy

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Kang Zhang, Yue Liu, Lili Wu, Ning Zhang, Lei Li, Lu Zhang, Haile Yan, Peter Hodgson, Minghui Cai
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引用次数: 0

Abstract

The present paper focuses on the recrystallization and multiple precipitation behaviors of a heavily cold–rolled Al0.3CoCrFeNi high–entropy alloy after annealing at temperatures from 700 and 850 °C. Three types of B2 precipitates with different morphologies and sizes form concurrently in the different regions of the microstructure. Post–annealing was also found to increase the fraction of Ʃ3 twin boundaries, which not only refines the austenite, but also facilitates the nucleation for B2 precipitates. The interaction among twins, precipitation and recrystallization plays a crucial role in the formation of the heterogeneous microstructure. As the annealing temperature increases, the yield strength of the alloy decreases while improving the ductility to some extent. Notably, when annealed at 750 °C for 1 h, the alloy demonstrated an optimal balance, exhibiting a yield strength of approximately 1040 MPa and ductility of about 22%. The heterogeneous microstructure triggered multiple strengthening mechanisms, and thus exerts an important effect on the overall tensile properties, along with dislocation slip and twinning–induced plasticity (TWIP) effect.
重冷轧 Al0.3CoCrFeNi 高熵合金中再结晶与沉淀相互作用对异质显微组织和拉伸性能的影响
研究了冷轧Al0.3CoCrFeNi高熵合金在700℃和850℃退火后的再结晶和多次析出行为。在微观组织的不同区域同时形成三种不同形态和尺寸的B2相。退火后还发现Ʃ3孪晶界的比例增加,这不仅使奥氏体细化,而且有利于B2相的形核。孪晶、析出和再结晶的相互作用对非均相组织的形成起着至关重要的作用。随着退火温度的升高,合金的屈服强度降低,但塑性得到一定程度的改善。值得注意的是,当在750℃下退火1 h时,合金表现出最佳的平衡,屈服强度约为1040 MPa,延展性约为22%。异质显微组织触发了多种强化机制,从而对整体拉伸性能以及位错滑移和孪晶诱导塑性(TWIP)效应产生重要影响。
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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