Microstructure features induced by fatigue crack initiation up to very-high-cycle regime for an additively manufactured aluminium alloy
文献类型：期刊论文
| 作者 | Pan, Xiangnan ; Du, Leiming; Qian, Guian; Hong, Youshi; Hong YS(洪友士); Qian GA(钱桂安); Pan XN(潘向南)
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| 刊名 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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| 出版日期 | 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. |
| WOS关键词 | METALLIC MATERIALS ; AL-12SI ALLOY ; EARLY GROWTH ; STRENGTH ; BEHAVIOR ; MECHANISM ; LIFE ; DAMAGE |
| 资助项目 | National Natural Science Foundation of China[11932020] |
| 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 |
| 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.,洪友士.,...&潘向南.(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. |
入库方式： OAI收割
来源：力学研究所
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