Abstract
The micromechanical properties of Zr-based metallic glass (MG) induced by laser shock peening (LSP) were studied through the use of nanoindentation. The serrations in representative load-displacement (P-h) curves exhibited a transformation from stairstep-like to ripple-shaped from untreated zone to shock region, which implied an increase in plastic deformation ability of material after LSP. Significant hardening was also observed in the impact zone, which can be attributed to the effect of compressive residual stress. Both increase in hardness and plastic deformation ability in shock region indicate the excellent effect of LSP on the micromechanical properties of investigated Zr-based MG, which provide a new way to study the deformation mechanism in metallic glasses and a further understanding of plasticization.
Highlights
As an attractive material, metallic glasses (MGs) have been extensively investigated during the last decades due to their unique characteristics, such as high yield strength, large elastic deformation, and excellent soft magnetic properties (Inoue, 2000; Wang et al, 2004; Greer and Ma, 2007)
The result of TEM identified that no crystalline grain was generated during LSP
The representative P-h curves near the center of the shock region exhibited ripple-shaped serrations; the serrations were gradually transformed into stairstep-like for the P-h curves of the region away from the impact region
Summary
Metallic glasses (MGs) have been extensively investigated during the last decades due to their unique characteristics, such as high yield strength, large elastic deformation, and excellent soft magnetic properties (Inoue, 2000; Wang et al, 2004; Greer and Ma, 2007). On the basis of these theoretical studies, a large number of researchers have tried to improve the plasticity of MGs by various methods. Di et al (2020) tried to modify mechanical properties of MG by the way of cryogenic thermal cycling; they made it successful that the plastic strain of FeCoBSiNb MG displayed an obvious improvement and maintained a high yield strength over 4,000 MPa, The Evolution of Micromechanical Properties adjusting to 4 GW/cm. The microstructure observation was conducted on a FEI Tecnai G2 transmission electron microscope
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