等通道转角挤压镁合金的微观组织和力学性能
Microstructure and Mechanical Properties of Mg Alloy Processed by ECAP
刘自乾， 冯小明， 张 会
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作者单位：（陕西理工学院 材料学院，陕西 汉中 723003）
中文关键字：等通道挤压； 镁合金； 微观组织； 晶粒细化
英文关键字：equal channel angular pressing(ECAP); Mg alloy; microstructure; grain refinement
中文摘要：采用自制的90°模具，分析不同的ECAP挤压路径对AZ31镁合金变形后的微观组织和力学性能的影响；对挤压后的试样进行显微组织观察、硬度测试，研究等通道挤压工艺（ECAP）对AZ31镁合金的晶粒细化效果。结果表明： Bc路径晶粒细化效果较好，随着挤压道次增加，晶粒发生细化， 7道次后晶粒尺寸由原来的70 μm细化到4.8 μm左右；硬度值随道次增加显著提高，3道次后达到最大值90.81 MPa，之后随道次增加，硬度略有下降，趋于稳定。
英文摘要：The influence of ECAP path on the microstructure and mechanical properties of AZ31 magnesium alloy were studied with self-made 90° die. Through the microstructure observation and hardness test of extrusion specimen, the grain refinement effect of AZ31 magnesium alloy under ECAP process was studied. The results show that there is a better grain refinement under Bc path, with the increase of extrusion pass, the grain is continuously refined, after seven passes, the grain size is refined from the original 70.0 μm to 4.8 μm; the hardness value significantly increases with the passes, the hardness value reaches the maximum 90.81 MPa after 3 passes, then the hardness slightly decreases and tends to stabilization.