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Title: Evolution of residual stress, free volume, and hardness in the laser shock peened Ti-based metallic glass

Abstract

Laser shock peening (LSP) with different cycles was performed on the Ti-based bulk metallic glasses (BMGs). The sub-surface residual stress of the LSPed specimens was measured by high-energy X-ray diffraction (HEXRD) and the near-surface residual stress was measured by scanning electron microscope/focused ion beam (SEM/FIB) instrument. The sub-surface residual stress in the LSP impact direction (about-170MPa) is much lower than that perpendicular to the impact direction (about -350 MPa), exhibiting anisotropy. The depth of the compressive stress zone increases from 400 mu m to 500 mu m with increasing LSP cycles. The highest near-surface residual stress is about -750 MPa. LSP caused the free volume to increase and the maximum increase appeared after the first LSP process. Compared with the hardness (567 +/- 7 HV) of the as-cast BMG, the hardness (590 +/- 9 HV) on the shocked surface shows a hardening effect due to the hardening mechanism of compressive residual stress; and the hardness (420 +/- 9 HV) on the longitudinal section shows a softening effect due to the softening mechanism of free volume.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
OSTI Identifier:
1395881
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 111; Journal Issue: C; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
bulk metallic glasses; free volume; hardness; high energy x-ray diffraction; laser shock peening; residual stress

Citation Formats

Wang, Liang, Wang, Lu, Nie, Zhihua, Ren, Yang, Xue, Yunfei, Zhu, Ronghua, Zhang, Haifeng, and Fu, Huameng. Evolution of residual stress, free volume, and hardness in the laser shock peened Ti-based metallic glass. United States: N. p., 2016. Web. doi:10.1016/j.matdes.2016.09.017.
Wang, Liang, Wang, Lu, Nie, Zhihua, Ren, Yang, Xue, Yunfei, Zhu, Ronghua, Zhang, Haifeng, & Fu, Huameng. Evolution of residual stress, free volume, and hardness in the laser shock peened Ti-based metallic glass. United States. https://doi.org/10.1016/j.matdes.2016.09.017
Wang, Liang, Wang, Lu, Nie, Zhihua, Ren, Yang, Xue, Yunfei, Zhu, Ronghua, Zhang, Haifeng, and Fu, Huameng. 2016. "Evolution of residual stress, free volume, and hardness in the laser shock peened Ti-based metallic glass". United States. https://doi.org/10.1016/j.matdes.2016.09.017.
@article{osti_1395881,
title = {Evolution of residual stress, free volume, and hardness in the laser shock peened Ti-based metallic glass},
author = {Wang, Liang and Wang, Lu and Nie, Zhihua and Ren, Yang and Xue, Yunfei and Zhu, Ronghua and Zhang, Haifeng and Fu, Huameng},
abstractNote = {Laser shock peening (LSP) with different cycles was performed on the Ti-based bulk metallic glasses (BMGs). The sub-surface residual stress of the LSPed specimens was measured by high-energy X-ray diffraction (HEXRD) and the near-surface residual stress was measured by scanning electron microscope/focused ion beam (SEM/FIB) instrument. The sub-surface residual stress in the LSP impact direction (about-170MPa) is much lower than that perpendicular to the impact direction (about -350 MPa), exhibiting anisotropy. The depth of the compressive stress zone increases from 400 mu m to 500 mu m with increasing LSP cycles. The highest near-surface residual stress is about -750 MPa. LSP caused the free volume to increase and the maximum increase appeared after the first LSP process. Compared with the hardness (567 +/- 7 HV) of the as-cast BMG, the hardness (590 +/- 9 HV) on the shocked surface shows a hardening effect due to the hardening mechanism of compressive residual stress; and the hardness (420 +/- 9 HV) on the longitudinal section shows a softening effect due to the softening mechanism of free volume.},
doi = {10.1016/j.matdes.2016.09.017},
url = {https://www.osti.gov/biblio/1395881}, journal = {Materials & Design},
issn = {0264-1275},
number = C,
volume = 111,
place = {United States},
year = {2016},
month = {12}
}