期刊论文

中文

塑性工程学报

1007-2012

2024

31

08

147-154

10.3969/j.issn.1007-2012.2024.08.018

52075159:国家自然科学基金 20224ACB218002:江西省自然科学基金资助项目 :江西省***高技能领军人才培养工程项目 2022JJ30019:湖南省自然科学基金资助项目 kq2208420:长沙市科技计划项目 2022GXYSOF24:国家重点实验室开放基金

本校为第一机构

采用分离式霍普金森压杆和多种显微表征方法研究了两种固溶温度下挤压WE43 镁合金的室温动态力学响应行为,应变速率为 2580～4120 s-1.结果表明,在高速冲击载荷下,形变孪晶具有较强的正应变速率敏感性,以致流变应力随应变速率的增加而增加.形变孪晶在变形中前期随应变的增加迅速增殖,使得其应变硬化率在应变为 0.03～0.10 时呈"驼峰"状.基面滑移和孪生相协调是高速冲击载荷下挤压态WE43 镁合金的主导塑性变形机制.采用多项式修正了原始J-C本构模型,构建了能够准确描述挤压态WE43 镁合金动态力学响应行为的本构模型.本构拟合结果与实验结果的偏差在±10%以内,其相关系数R和平均绝对相对误差eAARE...

The dynamic mechanical response behaviors of extruded WE43 magnesium alloy at room temperature at two solution temperatures were investigated by using split-Hopkinson pressure bar and various microcharacterization methods with strain rates of 2580-4120 s-1.The results show that the deformation twins show strong positive strain rate sensitivity under high-speed impact load,resulting in the increase of flow stress with the increase of strain rate.The deformation twins increase rapidly with the increase of strain in the middle and early stage,whic...