Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation

doi:10.1016/j.jallcom.2018.04.278

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	Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation
	Huang H; Jiang MQ(蒋敏强); Yan JW
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-07-25
卷号	754 页码:215-221
关键词	Metallic Glass Laser Irradiation Nanoindentation Softening Serrated Flow Shear Band
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.04.278
文献子类	Article
英文摘要	Laser irradiation has been recently used to tune the mechanical properties of metallic glasses (MGs). However, the mechanism for plasticity improvement by laser irradiation is still not completely clear and requires further investigation. In this study, nanosecond pulsed laser irradiation is applied on a Zr-based MG surface under various laser powers, scanning speeds, and numbers of irradiation cycles. Then, the mechanical properties of the as-cast and laser-irradiated MG surfaces are characterized by nanoindentation tests. In particular, the indentation hardness, load-depth curve, serrated flow, and residual indent morphology of the surfaces are compared. The results show that the nanosecond pulsed laser irradiation softens the irradiated regions; the effect of the irradiation is slightly dependent on the laser irradiation parameters, and especially the laser scanning speed. Furthermore, laser irradiation considerably affects serrated flows in the load-depth curve and shear bands on the top surface, denoting different plastic deformation characteristics compared with the non-irradiated sample. These differences could be rationalized in terms of laser irradiation-induced formation of pre-existing shear bands in the subsurface layer, as well as thermal effects. The present results are expected to enhance the general understanding of the effects of laser irradiation on the mechanical properties of MGs. (C) 2018 Elsevier B.V. All rights reserved.
分类号	一类
WOS关键词	MECHANICAL-PROPERTIES ; STRUCTURAL INHOMOGENEITY ; PLASTIC-DEFORMATION ; ENHANCED PLASTICITY ; SURFACE TREATMENT ; RESIDUAL-STRESS ; PRE-COMPRESSION ; NANOINDENTATION ; BEHAVIOR ; HARDNESS
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000432675600027
资助机构	National Natural Science Foundation of China(51705197 ; State Key Laboratory of Nonlinear Mechanics(LNM201802) ; China Association for Science and Technology ; Chinese Mechanical Engineering Society (CMES) ; Fundamental Research Funds for the Central Universities ; (26-04048) ; 11522221)
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/77507]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Huang H,Jiang MQ,Yan JW. Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,754:215-221.
APA	Huang H,蒋敏强,&Yan JW.(2018).Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation.JOURNAL OF ALLOYS AND COMPOUNDS,754,215-221.
MLA	Huang H,et al."Softening of Zr-based metallic glass induced by nanosecond pulsed laser irradiation".JOURNAL OF ALLOYS AND COMPOUNDS 754(2018):215-221.