Very-high-cycle fatigue induced growth and amorphization of Si particles in additively manufactured AlSi10Mg alloy: Dependence of applied stress ratio

doi:10.1016/j.ijfatigue.2022.107167

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	Very-high-cycle fatigue induced growth and amorphization of Si particles in additively manufactured AlSi10Mg alloy: Dependence of applied stress ratio
	Li JH(李江华); Sun JY(孙经雨); Li, Yajing 1; Qian GA(钱桂安); Wang, Zhiyang 2
发表期刊	INTERNATIONAL JOURNAL OF FATIGUE
	2022-11
卷号	164 页码:107167
ISSN	0142-1123
摘要	The microstructural evolution at the fracture surface in response to very-high-cycle fatigue (VHCF) under stress ratios (R) of-1 and 0.5 in an AlSi10Mg alloy produced by Laser Powder Bed Fusion was investigated. The results show that appreciable growth of the Si precipitates at the cellular network boundaries in the as-built micro-structure was observed under R =-1. Moreover, significant amorphization of the initial crystalline Si pre-cipitates occurred in the vicinity of the fracture surface under this condition. A layer of fine Al grains was developed in the fish-eye region of the fracture surface. These microstructural responses are rationalized by the generation of lattice defects including dislocations and sub-grain boundaries during cyclic pressing of crack surfaces under R =-1, which mediates the Si solute diffusion and re-precipitation in the alloy as well as the amorphization of initial Si crystalline precipitation. In contrast, far fewer dislocations were observed near the crack surfaces under R = 0.5, which is attributed to the absence of cyclic pressing of crack surfaces and severe plastic deformation in this scenario. This work provides insights into the stress ratio dependence of the micro -structural evolution in the fatigued Al alloys. The obtained knowledge is useful for future understanding of the fatigue failure in Al alloys produced by additive manufacturing.
关键词	Very-high-cycle fatigue Stress ratio Coarsening Amorphization AlSi10Mg alloy
学科领域	Engineering, Mechanical ; Materials Science, Multidisciplinary
DOI	10.1016/j.ijfatigue.2022.107167
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000858901200004
项目资助者	NSFC Basic Science Center Program [11988102] ; National Natural Science Foundation of China [12072345, 11932020, 11872364]
论文分区	一类
力学所作者排名	1
RpAuthor	Qian, GA (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China. ; Wang, ZY (corresponding author), Australian Nucl Sci & Technol Org ANSTO, Sydney, NSW 2234, Australia.
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/90170
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China 2.Tianjin Univ, Sch Chem Engn & Technol, Tianjin, Peoples R China 3.Australian Nucl Sci & Technol Org ANSTO, Sydney, NSW 2234, Australia
推荐引用方式 GB/T 7714	Li JH,Sun JY,Li, Yajing,et al. Very-high-cycle fatigue induced growth and amorphization of Si particles in additively manufactured AlSi10Mg alloy: Dependence of applied stress ratio[J]. INTERNATIONAL JOURNAL OF FATIGUE,2022,164:107167.
APA	李江华,孙经雨,Li, Yajing,钱桂安,&Wang, Zhiyang.(2022).Very-high-cycle fatigue induced growth and amorphization of Si particles in additively manufactured AlSi10Mg alloy: Dependence of applied stress ratio.INTERNATIONAL JOURNAL OF FATIGUE,164,107167.
MLA	李江华,et al."Very-high-cycle fatigue induced growth and amorphization of Si particles in additively manufactured AlSi10Mg alloy: Dependence of applied stress ratio".INTERNATIONAL JOURNAL OF FATIGUE 164(2022):107167.

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