Anisotropic stress corrosion cracking susceptibility of Mg-8Gd-3Y-0.5Zr alloy

IF 11.2 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science & Technology Pub Date : 2024-11-08 DOI:10.1016/j.jmst.2024.11.001

Jia Zeng, Jiaqi Li, Jingya Wang, Kai Chen, Zhao Shen

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Abstract

This study investigates the stress corrosion cracking (SCC) behavior of a Mg-8Gd-3Y-0.5Zr alloy in a 3.5 wt.% NaCl solution using slow strain rate tensile (SSRT) testing. The results reveal that SCC susceptibility increases as the strain rate decreases, with hydrogen embrittlement (HE) becoming more dominant at lower strain rates, leading to brittle fracture. Anodic dissolution (AD) plays a more significant role at higher strain rates, resulting in mixed fracture modes. Additionally, the mechanical properties and SCC resistance are strongly influenced by the sample orientation. TD-oriented samples show higher SCC susceptibility than RD-oriented ones due to the alignment of Gd- and Y-rich precipitates and grain boundaries, which act as initiation sites for SCC. These precipitates form micro-galvanic couples with the Mg matrix, accelerating localized corrosion and HE. The findings provide insights into the SCC mechanisms of VW83 alloy and highlight the importance of optimizing microstructure and processing conditions to improve its corrosion resistance.

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Mg-8Gd-3Y-0.5Zr 合金的各向异性应力腐蚀开裂敏感性

本研究采用慢应变速率拉伸（SSRT）测试方法，研究了 Mg-8Gd-3Y-0.5Zr 合金在 3.5 wt.% 氯化钠溶液中的应力腐蚀开裂（SCC）行为。结果表明，SCC 易感性随着应变速率的降低而增加，氢脆（HE）在较低的应变速率下变得更加主要，从而导致脆性断裂。阳极溶解（AD）在较高应变速率下起着更重要的作用，导致混合断裂模式。此外，机械性能和抗 SCC 能力还受到样品取向的强烈影响。定向 TD 样品比定向 RD 样品显示出更高的 SCC 易感性，这是由于富含 Gd 和 Y 的沉淀物和晶界排列在一起，成为 SCC 的起始点。这些析出物与镁基体形成微电偶，加速了局部腐蚀和 HE。这些发现有助于深入了解 VW83 合金的 SCC 机制，并强调了优化微观结构和加工条件以提高其耐腐蚀性的重要性。

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

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.