材料科学技术(英文版)2024，Vol.184Issue(17) ：245-255.DOI:10.1016/j.jmst.2023.10.019

Microstructural evolution and its influence on mechanical and corrosion behaviors in a high-Al/Zn containing duplex Mg-Li alloy after friction stir processing

Yixing Zhu Mengran Zhou Yingxin Geng Shun Zhang Tongzheng Xin Gaoqiang Chen Yifan Zhou Xiaoyu Zhou Ruizhi Wu Qingyu Shi
材料科学技术(英文版)2024，Vol.184Issue(17) ：245-255.DOI:10.1016/j.jmst.2023.10.019
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Microstructural evolution and its influence on mechanical and corrosion behaviors in a high-Al/Zn containing duplex Mg-Li alloy after friction stir processing

Yixing Zhu 1Mengran Zhou 1Yingxin Geng 1Shun Zhang 2Tongzheng Xin 3Gaoqiang Chen 1Yifan Zhou 1Xiaoyu Zhou 4Ruizhi Wu 2Qingyu Shi1
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作者信息

  • 1. State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,Beijing 100084,China
  • 2. Key Laboratory of Superlight Materials & Surface Technology(Ministry of Education),Harbin Engineering University,Harbin 150001,China
  • 3. Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China
  • 4. State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,Beijing 100084,China;Beijing North Vehicle Group Corporation,Beijing 100072,China
  • 折叠

Abstract

Ultralight Mg-Li alloys offer promising applications across various fields.Mg-Li alloys enriched with Al and Zn hold theoretical potential for achieving excellent mechanical strength and corrosion resistance.However,the structural and performance characteristics of such Mg-Li alloys,particularly after thermo-mechanical processing,remain inadequately explored and understood.This study investigated the mi-crostructural evolution of a Mg-9Li-5Al-4Zn alloy after friction stir processing and its consequent effects on the mechanical and corrosion performance.The grain size of the alloy was effectively refined and sta-bilized during friction stir processing at various heat inputs.The yield strength of the alloy increased by 86.4％after friction stir processing under the highest heat input condition,which was attributed to fine grain strengthening,solid solution strengthening and dispersion strengthening.Concurrently,the alloy ex-perienced a slight decrease in elongation after the friction stir processing.The alloy subjected to friction stir processing with the highest heat input exhibited a minimal corrosion current density of 6.10 x 10-6 A/cm2,which was only 25％of the base metal.The enhanced anti-corrosion properties can be attributed to the dispersion and distribution of precipitated particles induced by friction stir processing,which hin-dered the micro-galvanic corrosion and promoted the generation of a compact surface film,leading to minimal and uniform corrosion.This investigation can be significant for understanding the metallurgical mechanisms and performance evolution of Mg-Li alloys during thermomechanical processes.

Key words

Mg-Li-Al-Zn alloy/Friction stir processing/Microstructure evolution/Thermal-mechanical stability/Corrosion behavior

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基金项目

National Natural Science Foundation of China(U23A20541)

National Natural Science Foundation of China(52305385)

出版年

2024
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD
影响因子：0.657
ISSN：1005-0302
参考文献量62
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