Effect of Zn Content and Homogenization Treatment on Mechanical Properties and Corrosion Behavior of Mg-9Y-xZn Alloys

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-08-17 DOI:10.1007/s12540-024-01781-y

Ruizhi Zhang, Xiaojie Zhou, Ming Li, Xianzheng Lu, Xiaomin Chen, Xiaotong Pang, Jiahao Li, Jian Zhang

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Abstract

In this work, the effect of Zn content and homogenization treatment on the mechanical properties and corrosion behavior of the Mg-Y-Zn alloys was systematically investigated. When the Zn content in the as-cast alloys is increased to 3%, the Mg₂₄Y₅ eutectic phases disappear and the lamellar LPSO phases increase significantly. In the as-homogenized alloys, the Mg₂₄Y₅ eutectic phases are not detected and a large number of intragranular lamellar LPSO phases appear. The LPSO volume fraction decreases gradually with the extension of homogenization holding time. Numerous lamellar phases are precipitated in the furnace-cooling samples. The alloys with a higher interdendritic LPSO volume fraction (WZ93) or containing fine lamellar LPSO phases (H-6#) exhibit better mechanical properties. The continuous interdendritic secondary phases can act as a corrosion barrier to block the intrusion of corrosive fluid, but the lamellar LPSO phases are conducive to the corrosive fluid into the interior of the substrate. The H-3# alloy with numerous lamellar LPSO phases exhibits the worst corrosion resistance, while the WZ92 alloy with more continuous LPSO phases shows better corrosion resistance. This work indicates that the mechanical and corrosion properties can be improved by modulating the volume fraction and morphology of LPSO phases.

Graphical Abstract

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锌含量和均质化处理对 Mg-9Y-xZn 合金机械性能和腐蚀行为的影响

本研究系统地探讨了锌含量和均匀化处理对 Mg-Y-Zn 合金机械性能和腐蚀行为的影响。当铸造合金中的锌含量增加到 3% 时，Mg24Y5 共晶相消失，片状 LPSO 相显著增加。在均质合金中，Mg24Y5 共晶相没有被检测到，而出现了大量的晶内片状 LPSO 相。随着均质保温时间的延长，LPSO 体积分数逐渐降低。炉冷样品中析出大量片状相。树枝间 LPSO 体积分数较高的合金（WZ93）或含有细小片状 LPSO 相的合金（H-6#）具有更好的机械性能。连续的树枝状间次相可以作为腐蚀屏障阻挡腐蚀性液体的侵入，而片状 LPSO 相则有利于腐蚀性液体进入基体内部。具有大量片状 LPSO 相的 H-3# 合金表现出最差的耐腐蚀性，而具有更多连续 LPSO 相的 WZ92 合金则表现出更好的耐腐蚀性。这项工作表明，可以通过调节 LPSO 相的体积分数和形态来改善机械性能和腐蚀性能。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.