Synergistic strengthening mechanism of Mg and Si on Cu-Fe alloys with high strength and high conductivity

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-11-12 DOI:10.1016/j.msea.2024.147534

Xiangyu Yu , Yanlong Xiang , Yuke Li , Junbin Cheng , Liuxiong Luo , Shen Gong , Zhou Li , Xiaojun Li , Qiru Wang

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Abstract

In this study, high strength and conductivity Cu-Fe-Si-Mg alloys were produced by casting and multi-stage thermos-mechanical treatment (MTT). The electrical conductivity, yield strength, tensile strength and elongation of the Cu-2.5Fe-0.1Si-0.15 Mg alloys were 68.23 %IACS, 653 MPa, 692 MPa and 4.35 %, respectively. The addition of Mg was beneficial to reduce the generalized planar fault energy and increase the density of substructure. Meanwhile, there was a tendency for Mg atoms to segregate at the interfacial region where the second phase met the copper. The segregation of Mg effectively inhibited the growth of precipitates. There was a dramatic improvement in the ability of the second phase to pin dislocations. The overall properties of the Cu-Fe alloys were excellent. The synergistic addition of Mg and Si significantly improved the mechanical properties of the alloys, but the electrical conductivity slightly declined.

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镁和硅对高强度、高导电性铜铁合金的协同强化机制

本研究通过铸造和多级热机械处理（MTT）制备了高强度和导电性铜-铁-硅-镁合金。Cu-2.5Fe-0.1Si-0.15 Mg 合金的导电率、屈服强度、抗拉强度和伸长率分别为 68.23%IACS、653 兆帕、692 兆帕和 4.35%。镁的加入有利于降低广义平面断层能和增加下部结构的密度。同时，在第二相与铜的界面区域，镁原子有偏析的趋势。镁原子的偏析有效地抑制了析出物的生长。第二相针刺位错的能力显著提高。铜铁合金的整体性能非常出色。镁和硅的协同添加显著改善了合金的机械性能，但导电性略有下降。

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 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.