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研究了一种正挤压与等通道挤压相结合的新的Extrusion-Shearing(ES)变形方法。应用有限元法对ES变形过程进行了计算机模拟,表明ES技术可以大大提高累积应变和动态再结晶晶粒的体积分数。在Gleeble1500热模拟机上安装ES成形模具,对ES成形挤出的棒料进行微观组织观察,并对热模拟的数据进行处理。结果表明,ES成形可以细化晶粒并提高成形的均匀性。计算机模拟和热模拟实验表明,ES成形是一种新型的镁合金大塑性变形方法,可以有效细化晶粒、提高组织的均匀性。
A new Extrusion-Shearing (ES) deformation method combined with equal-channel extrusion was studied. The finite element method was used to simulate the deformation process of ES, which shows that the ES technique can greatly increase the volume fraction of cumulative strain and dynamic recrystallization grains. ES molds were mounted on a Gleeble1500 thermal simulator to microstructurally observe ES shaped extruded bars and to process the thermal simulated data. The results show that ES forming can refine grains and improve forming uniformity. Computer simulation and thermal simulation experiments show that ES forming is a new type of plastic deformation method of magnesium alloy, which can effectively refine the grains and improve the uniformity of the microstructure.