首页|ECAP对预置孪晶AZ31镁合金组织和力学性能的影响

ECAP对预置孪晶AZ31镁合金组织和力学性能的影响

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为了探究剪切变形对预置孪晶AZ31 镁合金组织和力学性能的影响,对应变量为 5%的预置孪晶试样在250℃进行了不同道次的等通道转角挤压(ECAP),随后对不同状态试样进行了显微组织观察和室温单轴拉伸测试.结果表明:预置孪晶试样经过ECAP变形后,试样组织与商用挤压态合金相比明显细化,延展性获得较大提高;且随着挤压道次的增加,合金晶粒更加细小均匀,延展性改善更加显著.其中,挤压四道次合金的室温断后伸长率较挤压态棒材提高了约 163%,表明预置孪晶后引入剪切变形能有效提高镁合金棒材的室温塑性.
Effect of ECAP on Microstructure and Mechanical Properties of Pre-twinned AZ31 Mg Alloy
In order to study the effect of shear deformation on the microstructure and mechanical properties of the pre-twinned AZ31 magnesium alloy,the pre-twinned samples with a strain level of 5%were subjected to different passes of equal channel angular pressing(ECAP)at 250℃.Subsequently,the microstructure observation and room-temperature uniaxial tensile test were carried out for the samples in different states.The results show that the microstructure of the samples is obviously refined compared with the commercial as-extruded alloy,and the ductility is improved greatly after ECAP deformation of the pre-twinned sample.And with the increase of passes,the grains are finer and more uniform,and the ductility is improved significantly.Among them,the room-temperature fracture elongation of the 4P sample is about 163%higher than that of the extruded alloy,indicating that the introduction of shear deformation can effectively improve the room-temperature plasticity of Mg alloy after pre-twinning.

AZ31 Mg alloypre-twinningequal channel angular pressing(ECAP)grain refinementdynamic recrystallization

芦鹏彬、吴畏、柴华、王利飞

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太原理工大学 材料科学与工程学院,山西 太原 030024

AZ31镁合金 预置孪晶 等通道转角挤压 晶粒细化 动态再结晶

中央引导地方科技发展专项项目山西省重点研发计划项目山西省专利实施推广专项项目中国博士后科学基金第71批面上资助项目山西省省筹资金资助回国留学人员科研项目

YDZJSX2021A010201803D421086202007182022M7105412022-038

2024

10.14158/j.cnki.1001-3814.20222198

热加工工艺
中国船舶重工集团公司热加工工艺研究所 中国造船工程学会船舶材料学术委员会

热加工工艺

CSTPCD北大核心
影响因子：0.55
ISSN：1001-3814
年,卷(期)：2024.53(11)