| Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy | |
Pan XN(潘向南); Du, Leiming; Qian GA(钱桂安) ; Hong YS(洪友士)
| |
| Corresponding Author | Hong, Youshi([email protected]) |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| 2024-02-20 | |
| Volume | 173Pages:247-260 |
| ISSN | 1005-0302 |
| Abstract | 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. |
| Keyword | Aluminium alloy Additive manufacturing Nanograins Very-high-cycle fatigue (VHCF) Crack initiation Mean stress |
| DOI | 10.1016/j.jmst.2023.07.023 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001073998400001 |
| WOS Keyword | METALLIC MATERIALS ; AL-12SI ALLOY ; EARLY GROWTH ; STRENGTH ; BEHAVIOR ; MECHANISM ; LIFE ; DAMAGE |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Funding Project | National Natural Science Foundation of China[11932020] |
| Funding Organization | National Natural Science Foundation of China |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Hong, Youshi |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/93135 |
| Collection | 非线性力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Pan XN,Du, Leiming,Qian GA,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.Rp_Au:Hong, Youshi |
| APA | 潘向南,Du, Leiming,钱桂安,&洪友士.(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 | 潘向南,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. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment