摘要
研究了Mg-12Al-0.7Si-0.09Sr镁合金在等通道挤压过程中微观组织与力学性能随着挤压道次的变化行为。结果表明,随着挤压道次的增加,基体晶粒不断细化。6道次细化效果最佳,从铸态约80μm细化至约6μm,连续网状分布的β-Mg17Al12相被挤碎至约3μm,Mg2Si相破碎至约2μm;8道次挤压后平均尺寸约为2μm。室温抗拉强度和伸长率分别为6道次和8道次挤压后达到最高,数值分别为316MPa和5.48%,高温(200℃)抗拉强度和伸长率则为2道次和6道次挤压后最佳,数值分别为223MPa和46.1%。
Microstructure and mechanical properties along with change of pressing times in Mg-12A1-0.7Si-0.09Sr magnesium alloy equal-channel angular pressing （ECAP） were investigated. The results show that accompanying with the pressing times increasing, matrix grains size transform continuously into small grains. Result of 6 pressing times is the best, grains from 80 μm in the as-cast state to about 6 Ixm, breaking up a network Mg17Al12 particles to about 3 μm, Mg2Si phase with a size of about 2μm. Average grain size is about 2 μm after 8 pressing times. The ultimate strength and elongation of this alloy at room temperature both remarkably increase, respectively, 316 MPa after 6 pressing times and 5.48% after 8 pressing times. During high temperature （200C） test, 2 pressing times specimens exhibit high strength（223 MPa） and 6 pressing times specimens have better elongation （46.1%）.
出处
《热加工工艺》
CSCD
北大核心
2012年第17期8-11,15,共5页
Hot Working Technology
基金
国家自然科学基金项目(5117536)
太原市大学生创新创业专项基金项目(110148056)
山西省青年科技研究基金项目(2008021033)
