Strain hardenability of a gradient metallic alloy under high-strain-rate compressive loading

doi:10.1016/j.matdes.2019.107695

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	Strain hardenability of a gradient metallic alloy under high-strain-rate compressive loading
	Fan JT 2; Jiang MQ(蒋敏强)1
刊名	MATERIALS & DESIGN
	2019-05-15
卷号	170 页码:8
关键词	Metallic alloy Gradient microstructure design Impact loading Strain hardening Rate dependency Dynamic fracture
ISSN号	0264-1275
DOI	10.1016/j.matdes.2019.107695
通讯作者	Fan, Jitang(Jitang_fan@hotmail.com)
英文摘要	Subjected to an impact loading, metallic alloys usually display strain softening due to the highly localized shear deformation accompanied by temperature rise, which causes the decrease of resistance to an applied loading and even catastrophic failure. In this work, strain hardening under high-rate compressive loading is firstly achieved in a developed metallic alloy with the gradient microstructure of both phases and grain sizes. Mechanical responses at different compressive loading rates all show a unique strain hardening. Rate dependencies of yielding and strain hardening are revealed and illustrated by a modified Johnson-Cook constitutive model. Dynamic deformation and fracture are characterized as macroscopic shear with the shielded cracks. The inherent toughening mechanisms are indicated as gradient straining with phase transformation, twinning and dislocation tangling. This work demonstrates that the highly localized shear deformation accompanied by temperature rise can be prevented by the gradient microstructure with martensitic transformations, twinnings and dislocations. It is full of interest to create a feasible route of developing the strain hardenable metallic alloys under impact loadings via architecturing the gradient microstructure. (C) 2019 The Authors. Published by Elsevier Ltd.
分类号	二类/Q1
资助项目	Beijing Institute of Technology Research Fund Program for Young Scholars, China ; Independent Research Project of State Key Laboratory of Explosion Science and Technology, China[QNKT17-03] ; Fundamental Research Funds for the Central Universities, China ; National Natural Science Foundation of China, China[11602024]
WOS关键词	MECHANICAL-BEHAVIOR ; GLASS COMPOSITES ; CUZR MARTENSITE ; STRENGTH ; FRACTURE ; STEEL ; DEFORMATION ; PLASTICITY ; IMPACT ; DAMAGE
WOS研究方向	Materials Science
语种	英语
WOS记录号	WOS:000462900600004
资助机构	Beijing Institute of Technology Research Fund Program for Young Scholars, China ; Independent Research Project of State Key Laboratory of Explosion Science and Technology, China ; Fundamental Research Funds for the Central Universities, China ; National Natural Science Foundation of China, China
其他责任者	Fan, Jitang
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/78934]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China 2.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China;
推荐引用方式 GB/T 7714	Fan JT,Jiang MQ. Strain hardenability of a gradient metallic alloy under high-strain-rate compressive loading[J]. MATERIALS & DESIGN,2019,170:8.
APA	Fan JT,&蒋敏强.(2019).Strain hardenability of a gradient metallic alloy under high-strain-rate compressive loading.MATERIALS & DESIGN,170,8.
MLA	Fan JT,et al."Strain hardenability of a gradient metallic alloy under high-strain-rate compressive loading".MATERIALS & DESIGN 170(2019):8.