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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

文献类型：期刊论文

作者Li JH(李江华); Sun JY(孙经雨); Li, Yajing3; Qian GA(钱桂安); Wang, Zhiyang2
刊名INTERNATIONAL JOURNAL OF FATIGUE
出版日期2022-11
卷号164页码:107167
ISSN号0142-1123
关键词Very-high-cycle fatigue Stress ratio Coarsening Amorphization AlSi10Mg alloy
DOI10.1016/j.ijfatigue.2022.107167
英文摘要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.
学科主题Engineering, Mechanical ; Materials Science, Multidisciplinary
分类号一类
语种英语
WOS记录号WOS:000858901200004
资助机构NSFC Basic Science Center Program [11988102] ; National Natural Science Foundation of China [12072345, 11932020, 11872364]
其他责任者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.
源URL[http://dspace.imech.ac.cn/handle/311007/90170]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Australian Nucl Sci & Technol Org ANSTO, Sydney, NSW 2234, Australia
2.Tianjin Univ, Sch Chem Engn & Technol, Tianjin, Peoples R China
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
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.

入库方式： OAI收割

来源：力学研究所

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