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.
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 ~C 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 rain, 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.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2009年第1期32-39,共8页
Transactions of Nonferrous Metals Society of China
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
