| 多向高速冲击下LZ91镁合金的力学性能及组织 |
| |
| 引用本文： | 江润桐,马香,何思雨,刘筱,朱必武.多向高速冲击下LZ91镁合金的力学性能及组织[J].有色金属加工,2021(1):8-14. |
| |
| 作者姓名： | 江润桐 马香 何思雨 刘筱 朱必武 |
| |
| 作者单位： | 湖南科技大学材料科学与工程学院;湖南科技大学机电工程学院 |
| |
| 基金项目： | 国家自然科学基金(52071139,51905166);湖南省自然科学基金(2020JJ5198)。 |
| |
| 摘 要： | 常温下采用霍普金森压杆在冲击气压为0.2MPa～0.7MPa的条件下对LZ91镁合金进行多向高速冲击,结合变形后的微观组织及应力应变曲线,分析应变速率和不同冲击方向对微观组织演变的影响.结果表明,冲击过程中β-Li和α-Mg的滑板效应和形变温升产生的软化作用和加工硬化存在竞争关系,导致随着应变速率增加和材料初始组织中位...
|
| 关 键 词： | LZ91镁合金 多向高速冲击 微观组织 裂纹 组织演变 |
Mechanical Properties and Microstructure of LZ91 Magnesium Alloy under Multidirectional High Speed Impact |
| |
| Jiang Runtong,Ma Xiang,He Siyu,Liu Xiao,Zhu Biwu.Mechanical Properties and Microstructure of LZ91 Magnesium Alloy under Multidirectional High Speed Impact[J].Nonferrous Metals Processing,2021(1):8-14. |
| |
| Authors: | Jiang Runtong Ma Xiang He Siyu Liu Xiao Zhu Biwu |
| |
| Affiliation: | (School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China) |
| |
| Abstract: | In this paper,LZ91 magnesium alloy is subjected to multi-directional high-speed impact at room temperature with a Hopkinson bar at 0.2MPa~0.7MPa.Combined with the microstructure and stress-strain curve after deformation,the influence of strain rate and impact direction on microstructure evolution is analyzed.The results show that there is a competitive relationship between the sliding plate effect ofβ-Li andα-Mg,the softening effect and work hardening caused by deformation temperature rise.The stress-strain curve does not increase monotonically with the increase of strain rate and dislocation density in the initial microstructure.When the local stress reaches a certain degree,adiabatic shear bands will be generated,and then dislocation tangles and micro holes will form in the adiabatic shear band,and finally leading to the initiation of cracks. |
| |
| Keywords: | LZ91 magnesium alloy multi direction high speed impacting microstructure crack microstructure evolution |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
