Enhancement of mechanical properties, electromagnetic shielding property and thermal conductivity of Mg-4Zn alloy via La alloying

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-14 DOI:10.1016/j.matchar.2025.115035

Shuai Yuan , Xianhua Chen , Wenlong Xu , Xiaohuan Pan , Yuan Yuan , Hong Yang , Baodong Shi , Jingyu Jiang , Fusheng Pan

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引用次数: 0

Abstract

Advanced structure-function integrated Mg alloys have great application prospects. In this work, the effects of La contents (1, 2, 3. wt%) on microstructure, mechanical properties, electromagnetic interference shielding effectiveness (EMI SE) and thermal conductivity (TC) of extruded Mg-4Zn (wt%) alloys are evaluated. The results show that the addition of La realizes the simultaneous enhancement of the strength, EMI SE and TC of the Mg-4Zn alloy. The Mg-4Zn-3La alloy exhibits an ultimate tensile strength of 291 MPa, an EMI SE of 106 dB at 1500 MHz, and a TC of 125.1 W/(m·K). This alloy shows superior comprehensive properties compared to other reported Mg alloys. The large number of second phases generated by adding La promotes dynamic recrystallization (DRX) through particle stimulated nucleation (PSN), achieving significant grain refinement accompanied by an increased texture intensity. This leads to improved mechanical properties of the alloys. Meanwhile, the increment of the second phase and the increased texture intensity are also the principal contributors to the enhancement of EMI SE and TC. The experimental findings of this study help to provide theoretical guidance for the design of new multifunctional Mg alloys through composition optimization and microstructure modulation.

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La合金化对Mg-4Zn合金力学性能、电磁屏蔽性能和导热性能的提高

先进的结构功能一体化镁合金具有广阔的应用前景。在这项工作中，La含量（1,2,3）的影响。wt%)对挤压Mg-4Zn （wt%）合金的显微组织、力学性能、电磁干扰屏蔽效能（EMI SE）和导热系数（TC）的影响进行了评价。结果表明，La的加入使Mg-4Zn合金的强度、EMI SE和TC同时得到提高。Mg-4Zn-3La合金的抗拉强度为291 MPa， 1500 MHz时EMI SE为106 dB， TC为125.1 W/（m·K）。与其他已报道的镁合金相比，该合金具有优越的综合性能。添加La产生的大量第二相通过粒子激发形核（PSN）促进了动态再结晶（DRX），实现了显著的晶粒细化，同时提高了织构强度。这导致合金的机械性能得到改善。同时，第二相的增加和织构强度的增加也是EMI SE和TC增强的主要原因。本研究的实验结果有助于通过成分优化和组织调制为新型多功能镁合金的设计提供理论指导。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.