通过纳米化和可控退火技术提高高镁铝镁合金的强度和抗应力腐蚀开裂性能

IF 11.2 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Z.C. Tang, W. Xu, D.Y. Zhao, B. Zhang
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引用次数: 0

摘要

传统Al-Mg合金的强度主要依靠冷变形和增加Mg含量,但当Mg含量高(>3 wt.%)时,它容易发生应力腐蚀开裂(SCC)。同时优化铝镁合金的强度和抗SCC性能是一项具有挑战性的工作。本研究介绍了一种通过动态塑性变形和优化退火,提高强度和抗SCC性能的纳米Al-10Mg (10wt .%)合金。变形后的样品呈现纳米级片层结构。随着退火温度的升高,合金的组织尺寸增大,位错密度减小,由片层晶向等轴晶转变。250℃退火的纳米Al-10Mg合金表现出优异的力学性能,敏化状态下的SCC敏感性降低。高比例的低角度晶界与降低位错密度可以有效抑制晶界析出相(GBPs)在敏化过程中的形核和生长,从而保持相对较低的GBPs覆盖率。研究结果为设计高Mg含量、高强度的铝镁合金提供了指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhancing strength and stress corrosion cracking resistance in high-Mg Al-Mg alloys through nanostructuring and controlled annealing

Enhancing strength and stress corrosion cracking resistance in high-Mg Al-Mg alloys through nanostructuring and controlled annealing
The strength of traditional Al-Mg alloys primarily depends on cold deformation and increasing Mg content, but it can become susceptible to stress corrosion cracking (SCC) when the Mg content is high (>3 wt.%). Simultaneous optimizing strength and SCC resistance in Al-Mg alloys is challenging. This study introduces a nanostructured Al-10Mg (10 wt.%) alloy with improved strength and SCC resistance by dynamic plastic deformation and optimized annealing. The as-deformed sample exhibits a nano-scaled lamellar structure. With rising annealing temperatures, structure size of the alloy increases while dislocation density decreases, transitioning lamellar to equiaxed grains. Nanostructured Al-10Mg alloys annealed at 250°C exhibit superior mechanical properties and reduced SCC susceptibility at sensitization state. The high fraction of low-angle grain boundaries with a reduction in dislocation density can effectively suppress the nucleation and growth of grain boundary precipitates (GBPs) during sensitization, thereby maintaining a relatively low GBPs coverage. The results provide guidance for designing Al-Mg alloys that are stronger and more resistant to SCC with higher Mg content.
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来源期刊
Journal of Materials Science & Technology
Journal of Materials Science & Technology 工程技术-材料科学:综合
CiteScore
20.00
自引率
11.00%
发文量
995
审稿时长
13 days
期刊介绍: Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.
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