Anomalous shear band characteristics and extra-deep shock-affected zone in Zr-based bulk metallic glass treated with nanosecond laser peening.
Anomalous shear band characteristics and extra-deep shock-affected zone in Zr-based bulk metallic glass treated with nanosecond laser peening.
复制标题
纳秒激光喷丸处理锆基大块金属玻璃的异常剪切带特性和超深冲击影响区
DOI：
10.1038/srep43948
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发表时间：
2017-03-07
影响因子：
4.6
通讯作者：
Wei B
中科院分区：
文献类型：
--
作者：
Wei Y;Xu G;Zhang K;Yang Z;Guo Y;Huang C;Wei B
研究了纳秒激光强化对zr41ti14cu12.5 ni10be22.5金属玻璃的影响。与结晶金属相比，喷丸处理产生了超深的冲击影响区。与传统的剪切带不同，在激光束的垂直方向上出现了大量的弧形剪切带并聚集在一起，形成了容纳塑性变形的基本单元。电弧剪切带在材料表面附近表现为短而离散的特征，在喷孔层深度越深越长越少，这与激光激波衰减密切相关。基于Hugoniot弹性极限和剪切带特性，建立了表征超深冲击影响区形成的能量耗散模型。结果表明，在一定的影响深度下对金属玻璃进行体积改性是可行的。此外，他们揭示了纳秒激光强化作为一种有效的方法来调整剪切带，以提高镁合金的延展性。
The effects of nanosecond laser peening on Zr41Ti14Cu12.5Ni10Be22.5metallic glass were investigated in this study. The peening treatment produced an extra-deep shock-affected zone compared to crystal metal. As opposed to the conventional shear bands, numerous arc shear bands appeared and aggregated in the vertical direction of the laser beam, forming basic units for accommodating plastic deformation. The arc shear bands exhibited short and discrete features near the surface of the material, then grew longer and fewer at deeper peened layer depths, which was closely related to the laser shock wave attenuation. An energy dissipation model was established based on Hugoniot Elastic Limit and shear band characteristics to represent the formation of an extra-deep shock-affected zone. The results presented here suggest that the bulk modification of metallic glass with a considerable affected depth is feasible. Further, they reveal that nanosecond laser peening is promising as an effective approach to tuning shear bands for improved MGs ductility.