Tuning the mechanical and corrosion properties of Al-Mg-Sc-Zr alloy processed by laser powder bed fusion through heat treatment

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-11 DOI:10.1177/00325899231214682

J. Shi, Qiang Hu, Xinming Zhao, Yonghui Wang, Jinhui Zhang

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Abstract

The current interest in Al-Mg-Sc-Zr alloy fabricated by powder bed fusion-laser beam (PBF-LB) is centered around excellent mechanical property without taking into account its corrosion behavior. In this work, gas-atomized Al-Mg-Sc-Zr alloy powder was manufactured by PBF-LB. The influence of heat treatment on microstructure, phase evolution, mechanical properties, and electrochemical corrosion behaviors were investigated and microstructure–property relationship was established to obtain high-performance alloy. The result suggests that the sample heat treated at 350°C for 4 h possesses highest mechanical properties, but is more susceptible to corrosion. When heat treatment temperature reaches 400°C, the loss of coherency for Al3(Sc, Zr) precipitates decreased the strength, but the Al6Mn phase is corroded as cathode instead of the α-Al matrix, thereby inhibiting the occurrence of pitting corrosion. The specimen heat treated at 300°C for 4 h exhibited high strength and high elongation as well as superior corrosion resistance.

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通过热处理调整激光粉末床熔融加工的 Al-Mg-Sc-Zr 合金的机械和腐蚀特性

目前，人们对通过粉末床熔融-激光束（PBF-LB）制造的铝镁钪锌合金的兴趣主要集中在其优异的机械性能上，而没有考虑到其腐蚀行为。本研究采用 PBF-LB 技术制造了气原子化 Al-Mg-Sc-Zr 合金粉末。研究了热处理对微观结构、相演化、力学性能和电化学腐蚀行为的影响，并建立了微观结构-性能关系，从而获得了高性能合金。结果表明，在 350°C 下热处理 4 小时的样品具有最高的机械性能，但更容易受到腐蚀。当热处理温度达到 400°C 时，Al3（Sc，Zr）析出物失去相干性，强度降低，但 Al6Mn 相作为阴极代替 α-Al 基体被腐蚀，从而抑制了点蚀的发生。在 300°C 下热处理 4 小时的试样具有高强度、高伸长率和优异的耐腐蚀性。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.