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管仁国,王祥,铁镝,任浩博,王宇翔,刘海峰,颜路飞,陈民芳.流变轧制AZ91合金的热处理和组织性能调控[J].稀有金属材料与工程(英文),2020,49(11):3718~3723.[Renguo Guan,Xiang Wang,Di Tie,Haobo Ren,Yuxiang Wang,Haifeng Liu,Lufei Yan and Minfang Chen.Tailoring the microstructure and mechanical properties of AZ91 alloy by rheo-rolling and heat treatment[J].Rare Metal Materials and Engineering,2020,49(11):3718~3723.]
Tailoring the microstructure and mechanical properties of AZ91 alloy by rheo-rolling and heat treatment
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Received:October 24, 2019  Revised:November 06, 2019
DOI:
Key words: AZ91 alloy  rheo-rolling  heat treatment  microstructure  mechanical properties
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目):51771045, U1764254, and 51974083;辽宁省科技厅项目:XLYC1802128
Author NameAffiliation
Renguo Guan,Xiang Wang,Di Tie,Haobo Ren,Yuxiang Wang,Haifeng Liu,Lufei Yan and Minfang Chen  
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Abstract:
      The evolution of microstructure and mechanical properties of the continuous rheo-rolled AZ91 magnesium alloy during heat treatment was revealed in the present study. Two kinds of Mg17Al12 phases precipitated from the supersaturated magnesium matrix were observed: most of which distributed discretely at grain boundary while the rest precipitated in alloy matrix in small size. With higher aging temperature, atom diffusion velocity increased and more precipitates formed. As a result, the hardness and the tensile strength peaked at 16h, whilst the elongation decreased with increasing time and temperature. The optimal comprehensive mechanical properties were obtained after solution treatment at 415 °C for 20 h and aging treatment at 220 °C for 16 h. The tailored hardness, tensile strength and elongation of the rheo-rolled alloy after heat treatment reached 99 HV, 251 MPa and 4.5%, respectively, which were significantly higher than that of the untreated alloy. Compared with traditional processing methods, rheo-rolling followed by heat treatment demonstrates its effectiveness on tailoring and obtaining balanced mechanical properties of AZ91 alloy.