Materials Reports  2020, Vol. 34 Issue (Z1): 307-311 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Annealing Treatment on Microstructure and Mechanical Properties ofLZ91 Dual-Phase Magnesium-Lithium Alloy Processed by Friction Stir Processing |
| JIANG Wen1,2, JIANG Luyao1,2, HUANG Weijiu1,2, GUO Fei1,2, DONG Haipeng1,2
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1 College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China;
2 Chongqing Key Laboratory of Mold Technology, Chongqing University of Technology, Chongqing 400054, China |
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Abstract Grains and phases in LZ91 dual-phase Mg-Li alloy could be refined and homogenized by friction stir processing (FSP). The effects of annealing treatment on the microstructure and mechanical properties of LZ91 dual-phase Mg-Li alloy processed by friction stirring were studied by optical microscopy (OM), scanning electron microscopy (SEM) and uniaxial tensile test. The results showed that initial microstructure characte-ristics affected organizational evolution. Uniform and small dual-phases could grow smoothly during heat treatment. Drastic organizational interface between stir zone and matrix was weakened during annealing treatment. Texture of fine grains in advancing side were increased slowly. Fine grains in α-islands grew fast in retreating side of samples. Uniform elongation of FSPed LZ91 increased from 5.8% to 8.8% after annealing treatment at 250 ℃ for 30 min. Stress concentration was improved in advancing side of samples. Reduction of area decreased from 0.2 to 0.1. The stress concentration was improved effectively, and the weak area was retrograde before and after annealing treatment.
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Published: 01 July 2020
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| Fund:This work was financially supported by Chongqing Research Program of Basic Research and Frontier Technology (cstc2018jcyjAX0107, cstc2019jcyj-msxmX0111), China Postdoctoral Science Foundation (2018M643407), Chongqing University of Technology Research Start-up Fund. |
| About author:: Wen Jiang, obtained her master's degree from Chongqing University of Technology. Her research inte-rests are plastic deformation of Mg-Li alloys during friction stir processing and corrosion resistance of deformed alloy ; Luyao Jiang, obtained her doctor's degree from Chongqing University and served in Chongqing University of Technology as a lecturer. Her research field are design and development new magnesium alloy with low cost and high performance and severe plastic deformation of magnesium alloys. The research findings were published in more than 10 papers in journals such as Materials Science and Engineering A, Journal of Alloys and Compounds, etc. |
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