期刊
SURFACE & COATINGS TECHNOLOGY
卷 467, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2023.129725
关键词
Bulk metallic glass; Laser-shock peening; Free volume; Shear bands; Nano-hardness
Laser-shock peening (LSP) is widely used to improve the mechanical properties of metallic components. In this study, the structure and nano-mechanical behaviors of a Ti40Zr25Ni3Cu12Be20 bulk metallic glass (BMG) before and after LSP processing were investigated. The LSP-treated BMG sample remains amorphous, and there is a reduction in local order extent with increasing laser-beam energy, leading to an increase in free-volume contents. The higher free-volume content results in a greater shear-band density and lower nano-hardness in the studied BMG samples.
As a versatile and nondestructive method, laser-shock peening (LSP) has been extensively utilized to improve the mechanical properties of metallic components. Nevertheless, the underlying mechanism for the LSP-induced structure transformation remains unclear. In this study, the structure and nano-mechanical behaviors of a Ti40Zr25Ni3Cu12Be20 bulk metallic glass (BMG) were investigated before and after LSP processing. The LSPtreated BMG sample remains its amorphous structure. As the laser-beam energy increases, there is a reduction in the local order extent of LSP-treated Ti40Zr25Ni3Cu12Be20 BMGs samples, i.e., an increase in the free-volume contents. A higher free-volume content caused a greater shear-band density for the studied BMG samples, causing a lower nano-hardness. Besides, there exists a gradient in nano-hardness along the LSP direction inside the sample, the nano-hardness increases along the LSP direction (gradually approaching the matrix hardness). This gradient effect can be attributed to the gradual decay of the shock-wave pressure with increasing the depth.
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