Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals
Commonly, the increased free surface of nanometals results in completely different mechanical behaviors from their bulk counterparts. At present, studies on the plasticity behavior of nanometals is widely carried out under quasi-static states. Understanding the plasticity mechanism of nanometals dur...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522005329 |
| _version_ | 1818496358924943360 |
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| author | Jian Liu Yali He Min Xia Yaowu Hu |
| author_facet | Jian Liu Yali He Min Xia Yaowu Hu |
| author_sort | Jian Liu |
| collection | DOAJ |
| description | Commonly, the increased free surface of nanometals results in completely different mechanical behaviors from their bulk counterparts. At present, studies on the plasticity behavior of nanometals is widely carried out under quasi-static states. Understanding the plasticity mechanism of nanometals during a high-speed forming process is largely unexplored. This study explored the rate dependence of the forming behaviors of Al and Au nanofilms using laser-induced ultrahigh strain rate forming processes. The results showed that the superplastic behavior of the nanofilms can be activated above a critical value of the strain rate (>2.0E8 s−1). The Al nanofilm exhibited a maximum vertical strain of ∼ 567% at a strain rate of 8.1E8 s−1, and that of the Au nanofilm was ∼ 620% at a strain rate of 8.8E8 s−1. The superplastic forming mechanism mediated by interstitials was revealed for the first time. Further, the potential contribution of the interstitial-mediated plasticity mechanism in breaking through grain size limit and constitutive model modification was discussed. The discovery of this particular mechanism supplements the deformation mechanism diagram and constitutive relationship of nanometals, and is thus of great significance to the study of material responses in extreme conditions and manufacturing process analysis and optimization. |
| first_indexed | 2024-12-10T18:32:15Z |
| format | Article |
| id | doaj.art-3286c5825c004768862beac6c4ab68e4 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-10T18:32:15Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-3286c5825c004768862beac6c4ab68e42022-12-22T01:37:54ZengElsevierMaterials & Design0264-12752022-09-01221110910Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometalsJian Liu0Yali He1Min Xia2Yaowu Hu3The Institute of Technological Sciences, Wuhan University, Wuhan 430072, ChinaThe Institute of Technological Sciences, Wuhan University, Wuhan 430072, ChinaDepartment of Engineering, Lancaster University, Lancaster LA1 4YW, United KingdomThe Institute of Technological Sciences, Wuhan University, Wuhan 430072, China; School of Power and Mechanical Engineering, Wuhan University, 430072 Wuhan, China; Corresponding author.Commonly, the increased free surface of nanometals results in completely different mechanical behaviors from their bulk counterparts. At present, studies on the plasticity behavior of nanometals is widely carried out under quasi-static states. Understanding the plasticity mechanism of nanometals during a high-speed forming process is largely unexplored. This study explored the rate dependence of the forming behaviors of Al and Au nanofilms using laser-induced ultrahigh strain rate forming processes. The results showed that the superplastic behavior of the nanofilms can be activated above a critical value of the strain rate (>2.0E8 s−1). The Al nanofilm exhibited a maximum vertical strain of ∼ 567% at a strain rate of 8.1E8 s−1, and that of the Au nanofilm was ∼ 620% at a strain rate of 8.8E8 s−1. The superplastic forming mechanism mediated by interstitials was revealed for the first time. Further, the potential contribution of the interstitial-mediated plasticity mechanism in breaking through grain size limit and constitutive model modification was discussed. The discovery of this particular mechanism supplements the deformation mechanism diagram and constitutive relationship of nanometals, and is thus of great significance to the study of material responses in extreme conditions and manufacturing process analysis and optimization.http://www.sciencedirect.com/science/article/pii/S0264127522005329Superplastic formingUltrahigh Strain RateLaser ShockMolecular Dynamics |
| spellingShingle | Jian Liu Yali He Min Xia Yaowu Hu Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals Materials & Design Superplastic forming Ultrahigh Strain Rate Laser Shock Molecular Dynamics |
| title | Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals |
| title_full | Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals |
| title_fullStr | Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals |
| title_full_unstemmed | Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals |
| title_short | Ultrahigh strain rate-activated superplastic forming of aluminum and gold nanometals |
| title_sort | ultrahigh strain rate activated superplastic forming of aluminum and gold nanometals |
| topic | Superplastic forming Ultrahigh Strain Rate Laser Shock Molecular Dynamics |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522005329 |
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