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Gradual shear band cracking and apparent softening of metallic glass under low temperature compression
Wu, S. J.; Wang, X. D.; Qu, R. T.; Zhu, Z. W.; Liu, Z. Q.; Zhang, H. F.; Zhang, Z. F.; Qu, RT; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
2017-08-01
Source PublicationINTERMETALLICS
ISSN0966-9795
Volume87Pages:45-54
AbstractMetallic glasses (MGs) usually exhibit synchronously enhanced plasticity and strength with decreasing the testing temperature. Although great efforts have been made, why MGs show better plasticity at low temperature remains unclear. In this work, the shear band cracking and fracture mechanism of a relatively brittle TiZr-based MG was investigated through methods of low temperature compression and 3D X-ray tomography. Pronounced apparent softening and profuse internal shear-band cracks were observed along with the improved plasticity, enhanced yield strength, decreased average softening rate, and reduced area of vein pattern as decreasing the testing temperature. Moreover, the fracture features can be correlated well with the compressive properties; and the true rupture stress that is carried by the still-bonded part of major shear band was found to be very close to the yield strength, demonstrating that the apparent softening should mainly originate from the cracking rather than dilation of shear band. The decreased softening rate can be fitted by a diffusion model, implying reduced atomic mobility and increased cracking resistance. Consequently, the improved plasticity of TiZr-MG at low temperature was attributed to the suppression of instant fracture and the enhanced resistance to shear band cracking, rather than the change of shear band density.; Metallic glasses (MGs) usually exhibit synchronously enhanced plasticity and strength with decreasing the testing temperature. Although great efforts have been made, why MGs show better plasticity at low temperature remains unclear. In this work, the shear band cracking and fracture mechanism of a relatively brittle TiZr-based MG was investigated through methods of low temperature compression and 3D X-ray tomography. Pronounced apparent softening and profuse internal shear-band cracks were observed along with the improved plasticity, enhanced yield strength, decreased average softening rate, and reduced area of vein pattern as decreasing the testing temperature. Moreover, the fracture features can be correlated well with the compressive properties; and the true rupture stress that is carried by the still-bonded part of major shear band was found to be very close to the yield strength, demonstrating that the apparent softening should mainly originate from the cracking rather than dilation of shear band. The decreased softening rate can be fitted by a diffusion model, implying reduced atomic mobility and increased cracking resistance. Consequently, the improved plasticity of TiZr-MG at low temperature was attributed to the suppression of instant fracture and the enhanced resistance to shear band cracking, rather than the change of shear band density.
description.department[wu, s. j. ; wang, x. d. ; qu, r. t. ; zhu, z. w. ; liu, z. q. ; zhang, h. f. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [wu, s. j.] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china
KeywordMetallic Glass Shear Band Fracture Mechanism Compression Low Temperature
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China (NSFC) [51331007, 51301174, 51434008 (U1435204), 51501190]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78034
Collection中国科学院金属研究所
Corresponding AuthorQu, RT; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Wu, S. J.,Wang, X. D.,Qu, R. T.,et al. Gradual shear band cracking and apparent softening of metallic glass under low temperature compression[J]. INTERMETALLICS,2017,87:45-54.
APA Wu, S. J..,Wang, X. D..,Qu, R. T..,Zhu, Z. W..,Liu, Z. Q..,...&Zhang, ZF .(2017).Gradual shear band cracking and apparent softening of metallic glass under low temperature compression.INTERMETALLICS,87,45-54.
MLA Wu, S. J.,et al."Gradual shear band cracking and apparent softening of metallic glass under low temperature compression".INTERMETALLICS 87(2017):45-54.
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