摘要
采用了100T挤压机对AZ31镁合金在不同温度不同挤压比下双向挤压成型。结果表明,挤压比为4.5时,显著地细化镁合金晶粒,晶粒尺寸可由铸态的400μm减小到挤压态的6μm;挤压比为10.125时,晶粒尺寸可以减小到3μm;变形材料的硬度、伸长率、压缩率和屈服强度值有了很大程度的提高,随着挤压温度的升高,硬度、压缩率、伸长率和屈服强度值呈降低趋势(250℃除外)。
A new dual-directional extrusion （DDE） technique is applied on AZ31 Mg alloy at different extrusion ratios and temperatures by an extruder whose maximum load is 100t. In this experiment, the grain size is significantly reduced from 400μm as-cast to 6μm as-extruded when the extrusion ratio is 4.5; while at elevated extrusion ratio of 10. 125, the grain size is reduced to 3 μm. The micro-hardness, compressive ratio, elongation and yield strength are all improved a lot and decreased with the increase of extrusion temperatures （except 250℃）.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第8期931-936,共6页
Journal of Chongqing University
基金
国家'973'计划资助项目(2007CB613704)
国家大学生科技创新基金资助项目(CQUCX-G-2007-39)
关键词
AZ31镁合金
双向挤压
组织与性能
动态再结晶
AZ31 magnesium alloy
dual-direction extrusion
microstructures and properties
dynamic recrystallization
