摘要
利用单辊低速旋铸方法制备出Mg3%Al1.2%Zn0.2%Mn合金厚条带,估算了不同转速下条带的冷却速度,并重点研究了条带正面及其横截面的显微组织。结果表明:单辊低速旋铸条带(300转分和500转分)的冷却速度在104K s和105K s之间,厚条带的晶粒较铸态组织晶粒细小。500转分的镁合金条带的断面组织晶粒沿横截面分布比较均匀,并基本均为等轴晶区。300转分条带的自由面出现部分柱状晶,而贴辊面及贴辊面和自由面之间的过度区都为等轴晶。
In this paper, the technology of rapidly solidified （RS） ribbons in Mg-3 % Al-1% Zn-0.2 % Mn alloy has been investigated using melt spinning technique with low speed. Cooling rate of the as-spun ribbons prepared at different wheel speed is estimated，Microstructures of as-spun ribbons are studied. The result indicates that the cooling rate of the as-spun ribbons with low speed is from 10^4 K/s to 10^5K/s. The grains of as-spun ribbons are smaller than the as-cast ingots＇. The microstrocture of the as-spun ribbon at 500 rpm along the cross section is uniform. While in the as-spun ribbon at 300 rpm, equiax crystals are found near the roller surface side, and near the unconfined flow surface, column crystals appear。
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2005年第4期607-609,共3页
Journal of Materials Science and Engineering
基金
河南省自然科学基金资助项目(0411051500)
教育部重点资助项目(204085)
关键词
厚条带
快速凝固
镁合金
显微组织
thick ribbons
rapid solidification
magnesium alloy
microstructure
作者简介
赵红亮．男（1972-），博士，副教授e—mail：zhlwkr@zzu．edu．cn
