摘要
A design of experiment technique was used to optimize the microstructure of the AZ91D alloy produced by rheo-casting. The experimental design consists of four parameters(pouring temperature,shearing temperature,shearing time and shearing rate) with three levels.The grain size and shape factor measurements of primaryα-Mg particles were conducted to determine the microstructure.The contribution of each parameter shows that pouring temperature is the most significant parameter affecting the grain size,and the shape factor highly depends on the shearing temperature.The optimized rheo-casting processing parameters are 650 C for pouring temperature,585℃for shearing temperature,40 s for shearing time,and 600 r/min for shearing rate.Under the optimized processing parameters,the average grain size is 28.53μm,and the shape factor is 0.591.
A design of experiment technique was used to optimize the microstructure of the AZ91D alloy produced by rheo-casting. The experimental design consists of four parameters （pouring temperature, shearing temperature, shearing time and shearing rate） with three levels. The grain size and shape factor measurements of primary α-Mg particles were conducted to determine the microstructure. The contribution of each parameter shows that pouring temperature is the most significant parameter affecting the grain size, and the shape factor highly depends on the shearing temperature. The optimized rheo-casting processing parameters are 650 ℃ for pouring temperature, 585 ℃ for shearing temperature, 40 s for shearing time, and 600 r/min for shearing rate. Under the optimized processing parameters, the average grain size is 28.53 um, and the shape factor is 0.591.
出处
《中国有色金属学会会刊：英文版》
CSCD
2008年第A01期91-95,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(2006CB605203)supported by the National Basic Research Program of China
Project(2006AA03Z115)supported by the Hi-techResearch and Development Program of China
关键词
镁合金
最佳化
铸造
参数处理
AZ91 D
rheo-casting
processing parameters
optimization
