Mechanical properties and corrosion behavior of hetero-structured lean Mg−1Bi−0.5Sn−0.5In alloy

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-05-01 DOI:10.1016/S1003-6326(24)66759-2

Hong-wei XU , Wen-ting XU , Wei-li CHENG , Jian LI , Li-fei WANG , Hui YU , Jin-hui WANG , Hua HOU , Kwang Seon SHIN

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Abstract

The microstructural characterization, corrosion behavior and tensile properties of the extruded lean Mg−1Bi−0.5Sn−0.5In (wt.%) alloy were investigated through scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray photoelectron spectroscopy (XPS), electrochemical measurements and tensile tests. The results reveal that a microstructure consisting of dynamically recrystallized and deformed grains is obtained. Notably, the investigated alloy exhibits excellent strength−ductility synergy, with tensile yield strength (TYS), ultimate tensile strength (UTS) and elongation (EL) of 254.8 MPa, 315.4 MPa, and 25.3%, respectively. Furthermore, in 3.5 wt.% NaCl solution, with the increase of immersion time, the dominant corrosion mechanism of the studied alloy transforms from pitting corrosion to filiform corrosion. After the immersion for 24 h, a composite oxide film (SnO₂− Bi₂O₃−In₂O₃) is formed, which delays the corrosion process, and the corrosion rate (P_H=1.53 mm/a) is finally stabilized.

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异质组织贫Mg−1Bi−0.5Sn−0.5In合金的力学性能和腐蚀行为

通过扫描电镜（SEM）、电子背散射衍射（EBSD）、x射线光电子能谱（XPS）、电化学测量和拉伸测试，研究挤压后的Mg−1Bi−0.5Sn−0.5In （wt.%）贫合金的显微组织表征、腐蚀行为和拉伸性能。结果表明，该合金的显微组织由动态再结晶和形变晶粒组成。值得注意的是，该合金的抗拉屈服强度（TYS）、极限抗拉强度（UTS）和伸长率（EL）分别为254.8 MPa、315.4 MPa和25.3%，具有良好的强度-延性协同效应。此外，在3.5 wt.% NaCl溶液中，随着浸泡时间的增加，合金的主要腐蚀机制由点蚀转变为丝状腐蚀。浸泡24 h后，形成SnO2 - Bi2O3 - In2O3复合氧化膜，延缓了腐蚀过程，最终稳定了腐蚀速率（PH=1.53 mm/a）。

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

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.