Gradual shear band cracking and apparent softening of metallic glass under low temperature compression
文献类型：期刊论文
| 作者 | Wu, S. J. ; Wang, X. D. ; Qu, R. T. ; Zhu, Z. W. ; Liu, Z. Q. ; Zhang, H. F. ; Zhang, Z. F. |
| 刊名 | INTERMETALLICS
 |
| 出版日期 | 2017-08-01 |
| 卷号 | 87页码:45-54 |
| ISSN号 | 0966-9795 |
| 关键词 | Metallic glass Shear band Fracture mechanism Compression Low temperature |
| 通讯作者 | Qu, RT ; Zhang, ZF (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China. |
| 中文摘要 | 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. |
| 学科主题 | Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 资助信息 | National Natural Science Foundation of China (NSFC) [51331007, 51301174, 51434008 (U1435204), 51501190] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2017-08-17 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/78034]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 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, Z. F..(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. |
入库方式： OAI收割
来源：金属研究所
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