Mechanical properties and fracture behavior of Mg-3Al-1Zn alloy under high strain rate loading

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:789

Article

Dai, Z. H.^1,2  Lu, L.^1,2,4  Chai, H. W.³  Xiao, X. H.⁵  Gong, X. L.⁴  Luo, S. N.^1,2 

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

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

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

[4] Univ Sci & Technol China, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230027, Anhui, Peoples R China

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

关键词: Magnesium alloys;    Mechanical properties;    Deformation;    Damage;   

DOI  :  10.1016/j.msea.2020.139690

来源: Elsevier

【 摘 要 】

Gas-gun experiments are carried out to study the mechanical properties and fracture behavior of a textured Mg-3Al-1Zn alloy under high strain rate. The impact direction (ID) is either perpendicular or parallel to crystallographic {0001} planes, referred to as ID parallel to < c > and ID perpendicular to < c >, respectively. Shock compression and spallation are achieved with different specimen-to-flyer plate thickness ratios. The Hugoniot elastic limits and spall strengths are estimated as 0.32-0.35 GPa and 0.9-0.92 GPa, respectively, showing weak anisotropy. The deformed specimens are characterized with scanning electron microscope and X-ray computed tomography. Abundant {10 (1) over bar2} extension twins are activated and the strain hardening rate exhibits a sharp increase and then decrease for the ID perpendicular to < c > specimen, while a small number of twins are observed and the hardening rate decreases monotonically for the ID parallel to < c > specimen. As a result of the anisotropic distribution of the beta-Mg17Al12 phase, cracks are generally distributed in the mid-part and connected together for the ID perpendicular to < c > case, while the distribution of cracks in the ID parallel to < c > specimen is relatively discrete along the ID and parallel to the rolling plane.

【 授权许可】

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