期刊
MATERIALS & DESIGN
卷 111, 期 -, 页码 473-481出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.09.017
关键词
Bulk metallic glasses; Laser shock peening; High energy X-ray diffraction; Residual stress; Free volume; Hardness
资金
- National Natural Science Foundation of China [51471035]
- Beijing Higher Education Young Elite Teacher Project
- Program of One Hundred Talented People of the Chinese Academy of Sciences
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-AC02-06CH11357]
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. (C) 2016 Elsevier Ltd. All rights reserved.
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