Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy

doi:10.1016/j.jmst.2023.07.023

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	Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy
	Pan, Xiangnan; Du, Leiming; Qian, Guian; Hong, Youshi
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2024-02-20
卷号	173 页码:247-260
关键词	Aluminium alloy Additive manufacturing Nanograins Very-high-cycle fatigue (VHCF) Crack initiation Mean stress
ISSN号	1005-0302
DOI	10.1016/j.jmst.2023.07.023
通讯作者	Hong, Youshi(hongys@imech.ac.cn)
英文摘要	Fatigue failure can still occur beyond 10(7) cycles, i.e. very-high-cycle fatigue (VHCF), in many metallic materials, such as aluminium alloys and high-strength steels. For VHCF of high-strength steels, a fine granular area (FGA) surrounding an inclusion is commonly identified as the characteristic region of crack initiation on the fracture surface. However, no such FGA feature and related crack initiation behaviour were observed in VHCF of conventionally cast or wrought aluminium alloys. Here, we first reported the distinct mechanisms of crack initiation and early growth, namely the microstructure feature and the role of FGA in VHCF performance for an additively manufactured (AM) AlSi10Mg alloy. The AM pores play a key role in fatigue crack initiation similar to that of the inclusions in high-strength steels, resulting in almost identical FGA behaviour for different materials under a range of mean stress with a stress ratio at R < 0 or R > 0. The profile microstructure of FGA is identified as a nanograin layer with Si rearrangement and grain boundary transition. This process consumes a large amount of cyclic plastic energy making FGA undertake a vast majority of VHCF life. These results will deepen the understanding of VHCF nature and shed light on crack initiation mechanism of other aluminium and AM alloys. (c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Natural Science Foundation of China[11932020]
WOS关键词	METALLIC MATERIALS ; AL-12SI ALLOY ; EARLY GROWTH ; STRENGTH ; BEHAVIOR ; MECHANISM ; LIFE ; DAMAGE
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:001073998400001
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93134]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Hong, Youshi
作者单位	Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Pan, Xiangnan,Du, Leiming,Qian, Guian,et al. Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2024,173:247-260.
APA	Pan, Xiangnan,Du, Leiming,Qian, Guian,&Hong, Youshi.(2024).Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,173,247-260.
MLA	Pan, Xiangnan,et al."Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 173(2024):247-260.