期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138844
关键词
Laser shock wave; Metallic glass; Grid nanoindentation
类别
资金
- National Natural Science Foundation of China [51401028, 51271193, 11402277, 11790292]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040303]
- Innovation Program [237099000000170004]
Nanosecond laser shock peening (NLSP) has been proved to be an effective way to enhance the mechanical properties of metallic components through modifying the surface microstructures. However, the micromechanism of structure and property fluctuations induced by shock wave propagation is still limited due to the intrinsic defects in crystalline materials. Here, NLSP treatment has been performed into the Ti-metallic glasses. Owing to the absence of dislocations, grain boundary and phase segregation, the structural signals caused by the shock wave could come into sight. According to grid nanoindentation results, the shock-affected region can be divided into three sections: (I) the rapid softening region, (II) the recovery region and (III) the matrix region. The fronted first pop-in event and the reduced hardness found in the subsurface region provide clear evidence of the release wave-induced structural rearrangement. The abnormal change of the average volume of the shear transformation zone (STZ) could be explained by a two-step transformation mechanism, due to the fluctuations of the weak spot induced by the release stress wave. By means of these results, this work provides an opportunity to shed light on the common laser-solid interaction.
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