镁及镁合金属于HCP结构,织构和晶粒尺寸是影响其性能的主要因素.本文对近年来镁及镁合金等通道转角挤压(Equal channel angular pressing,ECAP)的研究状况进行了综述,介绍了ECAP过程中影响镁及镁合金织构的主要因素.根据晶粒细化机制的不同,从两方面介绍了ECAP工艺制备镁及镁合金超细晶、纳米晶的进展,即"Bottom-up"和"Top-down"法.最后,提出了镁及镁合金ECAP具有发展潜力的研究方向.
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