Spall damage of a Ta particle-reinforced metallic glass matrix composite under high strain rate loading

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

卷:711

Article

Tang, X. C.^1,2,3  Jian, W. R.^1,2,3  Huang, J. Y.^2,3  Zhao, F.^2,3  Li, C.^2,3  Xiao, X. H.⁴  Yao, X. H.¹  Luo, S. N.^2,3 

[1] South China Univ Technol, Dept Engn Mech, Guangzhou 510640, Guangdong, Peoples R China

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

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

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Metallic glass;    Particle-reinforced composite;    Planar impact;    X-ray computed tomography;   

DOI  :  10.1016/j.msea.2017.11.032

来源: Elsevier

【 摘 要 】

We investigate deformation and damage of a Zr-based bulk metallic glass (BMG) and its Ta particle-reinforced composite (MGMC) under impact loading, as well as quasi-static tension for comparison. Yield strength, spall strength, and damage accumulation rate are obtained from free-surface velocity histories, and MGMC appears to be more damage-resistant. Scanning electron microscopy, electron back scattering diffraction and x-ray computed tomography, are utilized for characterizing microstructures, which show features consistent with macroscopic measurements. Different damage and fracture modes are observed for BMG and MGMC. Multiple well-defined spall planes are observed in BMG, while isolated and scattered cracking around reinforced particles dominates fracture of MGMC. Particle matrix interface serves as the source and barrier to crack nucleation and propagation under both quasi-static and impact loading. Deformation twinning and grain refinement play a key role in plastic deformation during shock loading but not in quasi-static loading. In addition, 3D cup-cone structures are resolved in BMG, but not in MGMC due to its heterogeneous stress field.

【 授权许可】

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