Capture Deformation Twinning in Mg during Shock Compression with Ultrafast Synchrotron X-Ray Diffraction

被引：35

作者：

Chen, S. ^{[1
]}

Li, Y. X. ^{[1
]}

Zhang, N. B. ^{[1
]}

Huang, J. W. ^{[1
]}

Hou, H. M. ^{[2
,3
]}

Ye, S. J. ^{[1
]}

Zhong, T. ^{[1
]}

Zeng, X. L. ^{[1
]}

Fan, D. ^{[1
]}

Lu, L. ^{[2
,3
]}

Wang, L. ^{[4
]}

Sun, T. ^{[5
]}

Fezzaa, K. ^{[5
]}

Zhang, Y. Y. ^{[1
]}

Tang, M. X. ^{[1
]}

Luo, S. N. ^{[1
,2
,3
]}

机构：

[1] Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China

[3] Southwest Jiaotong Univ, Inst Mat Dynam, Chengdu 610031, Sichuan, Peoples R China

[4] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China

[5] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 25期

基金：

国家重点研发计划;

关键词：

MAGNESIUM ALLOY; BEHAVIOR; PLASTICITY; DUCTILITY; AZ31;

D O I：

10.1103/PhysRevLett.123.255501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Deformation twinning plays a vital role in accommodating plastic deformation of hexagonal-closepacked (hcp) metals, but its mechanisms are still unsettled under high strain rate shock compression. Here we investigate deformation twinning in shock-compressed Mg as a typical hcp metal with in situ, ultrafast synchrotron x-ray diffraction. Extension twinning occurs upon shock compression along < 11<(2 > over bar>0) and < 10 (1) over bar0 >, but only upon release for loading along < 0001 >. Such deformation mechanisms are a result of the polarity of deformation twinning, which depends on directionality and relative magnitude of resolved shear stress and may be common for Mg and its alloys in a wide range of strain rates.

引用

页数：5

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