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

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

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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.

Mg-Li-Al-Zn alloyFriction stir processingMicrostructure evolutionThermal-mechanical stabilityCorrosion behavior

Yixing Zhu、Mengran Zhou、Yingxin Geng、Shun Zhang、Tongzheng Xin、Gaoqiang Chen、Yifan Zhou、Xiaoyu Zhou、Ruizhi Wu、Qingyu Shi

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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

Key Laboratory of Superlight Materials & Surface Technology(Ministry of Education),Harbin Engineering University,Harbin 150001,China

Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China

Beijing North Vehicle Group Corporation,Beijing 100072,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of China

U23A2054152305385

2024

10.1016/j.jmst.2023.10.019

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)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.184(17)
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