(哈尔滨理工大学 材料科学与工程学院，哈尔滨 150040)
摘 要: 采用等通道转角挤压(ECAP)对MB15合金试样进行挤压，利用有限元软件DEFORM-3D进行ECAP晶粒组织模拟，探索采用有限元模拟与实验分析相结合的方法，研究镁合金ECAP成形过程的晶粒组织变化规律。模拟结果表明：数值模拟后试样从头部P1处、中部P2处到尾部P3处的晶粒组织细化程度明显减小，平均晶粒尺寸从初始的13.32 μm减小到2.3~3.1 μm；采用ECAP方法进行一道次挤压，试样的平均晶粒尺寸从13.32 μm减小到2.2 μm。对比数值模拟与实验分析结果表明：两者在晶粒细化程度上吻合良好。
关键字: MB15合金；等通道转角挤压(ECAP)；晶粒细化；模拟
MB15 alloy prepared by equal-channel angular pressing
（School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China）
Abstract:The process of equal channel angular pressing (ECAP) was numerically simulated using a finite element software Deform-3D to study the improvement and advancement of plastic processing performance. The method of the combining application of finite element simulation and experimental analysis was explored to investigate the variation of grain structure during the ECAP forming process of Mg alloy. The results show that the grain size of the sample in different zones reduce remarkably, following the sequence of P1, P2 and P3. Its average grain size reduces to 2.3−3.1 μm from its former average size of 13.32 μm. The microstructures of the sample was observed by an metalloscope after the ECAP experiment within one pass. Its average grain size reduces from 13.32 μm to 2.2 μm. After comparing the results of finite element numerical simulation and the ones from experimental analysis, there is a good fit in grain refinement between the two.
Key words: MB15 alloy; equal-channel angular pressing (ECAP); grain refinement; simulation
