Effects of annealing and cold rolling on microstructural features, magnetic properties, tensile behavior and electrical resistance of FeCoNi(MnAl)x high entropy alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-10-08 DOI:10.1016/j.intermet.2024.108521

Afagh Akbari, Reza Vafaei, Hossein Jamali, Ehsan Mohammad Sharifi

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引用次数: 0

Abstract

In this study, the microstructure, magnetic properties, and tensile behavior of high entropy alloys of FeCoNi(MnAl)_x (x = 0–0.6, in molar ratios) were investigated after casting, cold rolling and annealing. X-ray diffractometry (XRD), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometer (VSM), and also tensile tests were used to evaluate phase formation, microstructure, magnetic behavior and tensile properties of the samples, respectively. The results showed that as the indices of x value increase to 0.6, crystallographic structures transform from FCC to FCC + BCC. This in turn decreased the magnetic saturation of FeCoNi(MnAl)_0.6 from 151 to 36 emu/g. Increasing x to 0.6, also raised the values of Hc from 3 to 16 Oe. This behavior was also observed in annealed and cold rolled alloys. Annealing treatment also released the residual stresses and resulted in reduction of Hc values. However, the highest values of Hc was observed in cold rolled samples which ranged from 5 to 25 Oe. The tensile strength of cold rolled and annealed alloys for x values of 0, 0.2, and 0.4, were 510, 635, and 910 Mpa, respectively. Furthermore, the electrical resistance augmented monotonously with an increasing value of x. It is therefore concluded that cold rolled and annealed high entropy alloys of FeCoNi(AlMn)x can present a variety combinations of tensile, magnetic, and electrical behavior when compared to other soft magnetic materials.

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退火和冷轧对 FeCoNi(MnAl)x 高熵合金的微观结构特征、磁性能、拉伸行为和电阻的影响

本研究调查了 FeCoNi(MnAl)x（x = 0-0.6，摩尔比）高熵合金在铸造、冷轧和退火后的微观结构、磁性能和拉伸行为。分别使用了 X 射线衍射仪 (XRD)、场发射扫描电子显微镜 (FE-SEM)、振动样品磁力计 (VSM) 和拉伸试验来评估样品的相形成、微观结构、磁性行为和拉伸性能。结果表明，当 x 指数增加到 0.6 时，晶体结构从 FCC 转变为 FCC + BCC。这反过来又使铁钴镍锰铝 0.6 的磁饱和度从 151 降至 36 emu/g。将 x 增加到 0.6 时，Hc 值也从 3 Oe 增加到 16 Oe。在退火和冷轧合金中也观察到了这种行为。退火处理也释放了残余应力，导致 Hc 值降低。不过，冷轧样品的 Hc 值最高，在 5 到 25 Oe 之间。冷轧和退火合金在 x 值为 0、0.2 和 0.4 时的抗拉强度分别为 510、635 和 910 兆帕。因此可以得出结论，与其他软磁材料相比，冷轧和退火的高熵铁钴镍(铝锰)x 合金具有多种拉伸、磁性和电气性能。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.