Exploring the effect of Cr and Mn on the intrinsic strength of the tensile properties of FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn multi-principal element alloys using in-situ EBSD

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xufeng Wang , Hongli Suo , Zili Zhang , Shangxiong Huangfu , Qiuliang Wang
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Abstract

As the composition elements in multi-principal element alloys increase, it can bring excellent mechanical properties. However, the strengthening mechanism of the additional element is still unclear. In this work, we establish a method based on the in-situ EBSD technology to explore the possible effect of additional elements on the intrinsic strength of tensile properties. We prepared four different multi-principal element alloys, including FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn with similar initial status. We systematically investigated the evolution of the microstructure, dislocation density, twin boundary, grain size, and element distribution during the tensile process by in-situ EBSD and EDS. By carefully analyzing the results of four different multi-principal element alloys, the strength effects of the solid-solution hardening, grain-boundary hardening, twin boundary hardening, precipitate hardening, and dislocation hardening were peeled. The effect of the Cr and Mn element addition on the intrinsic strength can be explored. It is found that the element addition indeed increases the intrinsic strength from quaternary to quinary but not very clear from ternary to quaternary no matter Cr or Mn, which indicated that the intrinsic strength was more related to the number of elements in the alloy than to which element was present. This can be explained using the mixing entropy theory, which states that the intrinsic strength is enhanced when the mixing entropy is over a threshold between the MEA and HEA. This paper presents a method to study the individual factors affecting the tensile properties, which can help other researchers to better investigate HEA.
利用原位 EBSD 探索铬和锰对铁钴镍合金、铁钴镍锰合金、铁钴镍铬合金和铁钴镍铬锰合金拉伸性能内在强度的影响
随着多主元素合金中组成元素的增加,它可以带来优异的机械性能。然而,附加元素的强化机理尚不清楚。在这项工作中,我们建立了一种基于原位 EBSD 技术的方法,以探索附加元素对拉伸性能内在强度的可能影响。我们制备了四种不同的多元素合金,包括初始状态相似的铁钴镍合金、铁钴镍锰合金、铁钴镍铬合金和铁钴镍铬锰合金。我们通过原位 EBSD 和 EDS 系统地研究了拉伸过程中微观结构、位错密度、孪晶边界、晶粒尺寸和元素分布的演变。通过仔细分析四种不同多主元素合金的结果,剥离了固溶硬化、晶界硬化、孪晶界硬化、沉淀硬化和位错硬化对强度的影响。探讨了铬和锰元素的添加对本征强度的影响。结果发现,添加元素确实会提高从四元到二元的本征强度,但从三元到四元的本征强度却不太明显,无论添加的是铬还是锰。这可以用混合熵理论来解释,即当混合熵超过 MEA 和 HEA 之间的临界值时,本征强度就会增强。本文提出了一种研究影响拉伸性能的个别因素的方法,有助于其他研究人员更好地研究 HEA。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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