摘要
为研究镁合金动态载荷条件下的各向异性,采用分离式Hopkinson压杆对不同取样方向的ZK61M镁合金圆柱形试样进行高应变速率动态压缩实验,得到不同应变速率下合金的应力-应变曲线,并用金相显微镜表征动态压缩后的微观组织。结果表明,对于0°和45°取样方向的试样,在应变速率为716~1500 s^-1范围内,随着应变速率的提高,组织中孪晶数量呈现增加的趋势,其应变硬化程度大,表现为正的应变强化效应。对于90°取样方向试样,在应变速率为739 s^-1时,变形模式以孪生为主,但随着应变速率提高,孪晶数量呈减少趋势。ZK61M镁合金板材动态压缩性能存在明显的各向异性,压缩方向与板材法向成45°方向试样剪切敏感性最强,90°方向试样剪切敏感性最弱。
To study the anisotropy of magnesium alloy under dynamic loading condition,the dynamic compression tests of cylindrical ZK61 M magnesium alloy specimens in different sampling directions were carried out under high strain rate using split Hopkinson pressure bar. The stress-strain curves of alloy at different strain rates were obtained,and the microstructure after dynamic compression was observed by metallographic microscope. The results show that the number of twins tends to increase with the increase of strain rate for the specimens in the direction of 0° and 45° within the strain rate ranges of 716 s^-1 to 1500 s^-1. The strain hardening degree is large,which indicates a positive strain strengthening effect. When the strain rate is 739 s^-1,the deformation mode for the specimen in the direction of 90° is mainly controlled by twining,but with the increase of strain rate,the number of twins tends to decrease. The dynamic compression property of ZK61 M magnesium alloy sheet has obvious anisotropy. The shear sensitivity of the sample is the strongest in the 45° direction between the compression direction and sheet normal direction and the weakest in the 90° direction.
作者
姜丽红
郭正华
杨亮
郦逸凡
邹兰欣
JIANG Li-hong;GUO Zheng-hua;YANG Liang;LI Yi-fan;ZOU Lan-xin(Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province,Nanchang Hangkong University,Nanchang 330063,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第11期188-194,共7页
Journal of Plasticity Engineering
基金
江西省自然科学基金资助项目(20202BABL214004)
江西省教育厅青年基金资助项目(GJJ190527)
江西省重大科技研发专项项目(20194ABC28001)
江西省金属材料微结构调控重点实验室开放基金资助项目(EJ201903433)。
关键词
ZK61M镁合金
动态压缩性能
剪切变形
微观组织
各向异性
ZK61M magnesium alloy
dynamic compression properties
shear deformation
microstructure
anisotropy
