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Effect of Sb on microstructure of semi-solid isothermal heat-treated AZ61-0.7Si magnesium alloy

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【作者】 杨明波； 沈佳； 潘复生；

【Author】 YANG Ming-bo1, 2, SHEN J ia1, PAN Fu-sheng2 1. College of Materials Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China; 2. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China

【机构】 College of Materials Science and Engineering, Chongqing Institute of Technology； College of Materials Science and Engineering, Chongqing University；

【摘要】 The microstructure of semi-solid isothermal heat-treated AZ61-0.7Si magnesium alloy was investigated, and compared with that of the Sb-modified AZ61-0.7Si alloy. The results indicate that it is possible to produce the AZ61-0.7Si alloy with a non-dendritic microstructure by semi-solid isothermal heat treatment, and adding 0.4% Sb can accelerate the non-dendritic microstructural evolution of the alloy. After being treated at 580 ℃ for 120 min, the Sb-modified AZ61-0.7Si alloys can obtain a non-dendritic microstructure with a higher liquid content (16%-18%) and finer unmelted primary solid particles (43-53 μm) compared with the alloy without Sb modification. In addition, after being treated at 580 ℃ for 120 min, the Mg2Si phases in the AZ61-0.7Si alloys with and without Sb modification change from initial Chinese script shape to granule and/or polygon shapes.

【Abstract】 The microstructure of semi-solid isothermal heat-treated AZ61-0.7Si magnesium alloy was investigated, and compared with that of the Sb-modified AZ61-0.7Si alloy. The results indicate that it is possible to produce the AZ61-0.7Si alloy with a non-dendritic microstructure by semi-solid isothermal heat treatment, and adding 0.4% Sb can accelerate the non-dendritic microstructural evolution of the alloy. After being treated at 580 ℃ for 120 min, the Sb-modified AZ61-0.7Si alloys can obtain a non-dendritic microstructure with a higher liquid content (16%-18%) and finer unmelted primary solid particles (43-53 μm) compared with the alloy without Sb modification. In addition, after being treated at 580 ℃ for 120 min, the Mg2Si phases in the AZ61-0.7Si alloys with and without Sb modification change from initial Chinese script shape to granule and/or polygon shapes.

【关键词】 magnesium alloy； AZ61-0.7Si alloy； semi-solid isothermal heat treatment； Mg2Si phase； Sb；
【Key words】 magnesium alloy； AZ61-0.7Si alloy； semi-solid isothermal heat treatment； Mg2Si phase； Sb；
【基金】 Project(50725413) supported by the National Natural Science Foundation for Distinguished Young Scholar in China;Project (2007CB613704) by the Naitonal Basic Research Program of China;Projects(2006AA4012-9-6, 2007BB4400) supported by the Chongqing Science and Technology Commission of China
  • 【文献出处】 Transactions of Nonferrous Metals Society of China ,中国有色金属学会会刊(英文版) , 编辑部邮箱 ,2009年01期
  • 【分类号】TG146
  • 【被引频次】18
  • 【下载频次】104
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