摘要
采用分离式霍普金森压杆测试了高应变挤压下Mg-5.5Zn-2Nd合金的组织和力学性能变化。研究结果表明,Mg-5.5Zn-2Nd镁合金挤出过程产生再结晶组织,平均粒径在25mm附近,观察到一些晶粒的孪生组织,且各孪生结构之间往往保持互相平行分布特点。当试件沿水平方向受压时,试件没有出现屈服现象;纵向受压试验后,形成了有持续屈服和很强正应变率结果。材料的纵向应变强化速率呈现出降低趋势,随着材料应变增加变形作用机理变化明显。该研究有助于提高镁合金成形质量,为后续工艺优化奠定一定的理论基础。
The microstructure and mechanical properties of Mg-5.5Zn-2Nd alloy during high-strain extrusion were investigated using a split Hopkinson pressure bar.Results indicate that recrystallized microstructure with an average grain size around 25μm formed during extrusion.Twin structures were observed in some grains,often exhibiting parallel distribution between twin planes.No yield phenomenon occurred when specimens were subjected to horizontal compression;Following longitudinal compression testing,sustained yielding and high positive strain rate behavior were observed.The longitudinal strain hardening rate exhibited a decreasing trend,with a noticeable shift in deformation mechanisms as material strain increased.This research contributes to enhancing the forming quality of magnesium alloys and provides a theoretical foundation for subsequent process optimization.
作者
方雅
冯佩佩
王镇
刘保军
FANG Ya;FENG Peipei;WANG Zhen;LIU Baojun(School of Mechanical Engineering,Henan Polytechnic,Nanyang 473000,Henan China;Henan Zhong Optical Group Co.,Ltd.,Nanyang 473000,Henan China)
出处
《锻压装备与制造技术》
2025年第5期111-113,共3页
China Metalforming Equipment & Manufacturing Technology
关键词
高应变挤压
镁合金
各向异性
组织演变
High-strain extrusion
Magnesium alloy
Anisotropy
Microstructural evolution
