Improving strength-ductility balance of a brittle Al-doped FeCrNi multi-principal element alloy by introducing a heterostructure with hard phase enveloping soft phase

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2024-10-21 DOI:10.1016/j.intermet.2024.108542

Yating Lin , Jinrong Wang , Lihao Hu , Lu Zhang , Rui Zhang , Jianxin Yu , Baolin Wu

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Abstract

In the present work, a heterostructure was created in a brittle Al-doped FeCrNi multi-principal element alloy via thermomechanical treatment. This heterostructure consists of a hard phase surrounding a soft phase, with the soft defect-free face-centered cubic (FCC) phase formed through phase transformation evenly distributed within the hard body-centered cubic (BCC) matrix. This unique heterostructure promotes more uniform deformation, thereby enhancing the deformability of the original hard BCC matrix. As a result, the elongation was increased from 2.4 % to 17 %, while the ultimate tensile strength was just decreased from 1076 MPa to 1021 MPa. The maintenance of strength is primarily attributed to the hetero-deformation-induced (HDI) strengthening effect provided by this distinctive heterostructure. Overall, this special heterostructure formed through phase transformation opens up new possibilities for developing alloys with both high strength and ductility.

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通过引入硬相包软相的异质结构改善脆性铝掺杂铁铬镍多主元合金的强度-电导率平衡

在本研究中，通过热机械处理在脆性铝掺杂铁铬镍多主元素合金中创建了一种异质结构。这种异质结构由硬相包围软相组成，通过相变形成的无缺陷面心立方（FCC）软相均匀分布在硬质体心立方（BCC）基体中。这种独特的异质结构可促进更均匀的变形，从而增强原始硬质 BCC 基体的可变形性。因此，伸长率从 2.4% 提高到 17%，而极限拉伸强度仅从 1076 兆帕降低到 1021 兆帕。强度的保持主要归功于这种独特的异质结构所提供的异质变形诱导（HDI）强化效应。总之，这种通过相变形成的特殊异质结构为开发具有高强度和延展性的合金提供了新的可能性。

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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.