研究了Mg-12A1-0.7Si镁合金在等通道转角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90 μm细化至约8 μm,连续网状分布的β-Mg17Al12相被挤碎至约4 μm,汉字状Mg2Si相破碎且趋于均匀分布,8道次挤压后平均尺寸为2～3 μm.室温抗拉强度和伸长率在6道次和8道次挤压后达到最高,分别为293 MPa和5.1％.高温抗拉强度和伸长率在2道次和6道次挤压后最佳,分别为204 MPa和34.4％.基面(0002)晶面取向随挤压道次增加而逐渐增强,形成基面变形织构.
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