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应用挤压-剪切大变形工艺细化AZ31镁合金晶粒

ISSN号：1003-6326
期刊名称：《中国有色金属学报：英文版》
时间：0
分类：TG146[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]重庆理工大学材料科学与工程学院,重庆400054, [2]重庆大学国家镁合金材料工程技术研究中心,重庆400044
相关基金：Project （2007CB613700） supported by the National Basic Research Program of China; Project （50725413）supported by the National Natural Science Foundation of China; Project （CQ CSTC 2010BB4301）supported by National Science Foundation of Chongqing China; Project （CSTC2009AB4008） supported by Chongqing Sci ＆ Tech Development Program China; Project （2010CSTC-HDLS）supported by Chongqing Sci ＆ Tech Commission China

关键词：镁合金, 挤压-剪切工艺, 晶粒细化, 热模拟仪, magnesium alloys, extrusion-shearing process, grain refinement, physical simulator

中文摘要：

提出一种新型的镁合金复合挤压方法,将传统的挤压和大塑性变形方法等通道挤压相结合,也就是将压缩变径挤压和剪切（一次或者连续二次）相结合（简称ES）。根据ES变形的思想,设计并制造了适合热模拟仪Gleeble1500D的ES挤压装置,进行了不同温度下的AZ31镁合金ES挤压测试,观察了ES挤压所得到的AZ31镁合金挤压棒的微观组织。结果表明：当挤压比为4时,ES挤压的累计应变为2.44,可得到平均尺寸为2μm的微观组织。动态再结晶的发生是ES挤压产生晶粒细化的主要原因。根据ES热模拟挤压过程的应力—应变曲线和挤压力曲线的特点,ES热模拟实验中镁合金发生了与一般动态再结晶过程不一样的再结晶过程,具有明显的两个动态再结晶阶段,被称为＂双级动态再结晶＂。基于热模拟的ES挤压证明了ES挤压是可行的。生产实践结果表明,不同条件下的工业ES挤压可大批量生产镁合金挤压棒材。

英文摘要：

A new severe plastic deformation （SPD） method that is extrusion-shearing （ES）, which includes initial forward extrusion and shearing process subsequently, was developed to fabricate the fine grained AZ31 Mg alloys. The components of ES die were manufactured and installed to gleeble1500D thermo-mechanical simulator. Microstructure observations were carried out in different positions of ES formed rods. The results show that homogeneous microstructures with mean grain size of 2 μm are obtained at lower temperature as the accumulated true strain is 2.44. Occurring of continuous dynamic recrystallization （DRX） is the main reason for grain refinement during ES process. The experimental results show that the ES process effectively refines the grains of AZ31 magnesium. The production results of ES extrusion with industrial extruder under different extrusion conditions show that the ES extrusion can be applied in large-scale industry.