Microstructure and Mechanical Properties of a New Al0.5CrFeMnCo2 High Entropy Alloy

IF 1.6 4区材料科学 Q2 Materials Science

Transactions of The Indian Institute of Metals Pub Date : 2024-08-08 DOI:10.1007/s12666-024-03438-1

Yang Zhang, Yang Shen, Xiaoyang Chen, Shunping Sun, Mengqi Cong, Yanlei Li

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Abstract

In this study, a new Al_0.5CrFeMnCo₂ (molar ratio) high entropy alloy was designed. The microstructure and mechanical properties of as-cast and annealed Al_0.5CrFeMnCo₂ high entropy alloy were investigated. FCC+BCC duplex-phase structure is formed in as-cast Al_0.5CrFeMnCo₂ high entropy alloy. Dendritic FCC phase is the predominant constituent phase, and BCC/B2 coherent structure is formed in the inter-dendritic BCC phase. A large number of short-rod small-sized BCC phases are precipitated within FCC dendrites after annealing at 1000 °C for 6 h but unobserved after annealing at 1100 °C and 1200 °C for 6 h. The as-cast Al_0.5CrFeMnCo₂ high entropy alloy exhibits favorable comprehensive mechanical properties, with a compressive fracture strength of 1493 MPa and a plastic strain of 28.3%. After annealing at 1000 °C for 6 h, the compressive fracture strength and plastic strain reached are improved to 1676 MPa and 32.6%, respectively. However, further increase in annealing temperature results in gradual decrease in mechanical properties.

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新型 Al0.5CrFeMnCo2 高熵合金的显微结构和力学性能

本研究设计了一种新型 Al0.5CrFeMnCo2（摩尔比）高熵合金。研究了铸造和退火 Al0.5CrFeMnCo2 高熵合金的微观结构和力学性能。在铸造的 Al0.5CrFeMnCo2 高熵合金中形成了 FCC+BCC 双相结构。树枝状 FCC 相是主要的组成相，树枝状 BCC 相间形成 BCC/B2 相干结构。在 1000 ℃ 退火 6 小时后，FCC 树枝状相中析出了大量短棒小尺寸 BCC 相，但在 1100 ℃ 和 1200 ℃ 退火 6 小时后未观察到这种现象。在 1000 °C 下退火 6 小时后，抗压断裂强度和塑性应变分别提高到 1676 兆帕和 32.6%。然而，进一步提高退火温度会导致机械性能逐渐下降。

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来源期刊

Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys

CiteScore

2.60

自引率

6.20%

发文量

期刊介绍： Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.