Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites
Amorphous/crystalline nanolaminate composites have aroused extensive research interest because of their high strength and good plasticity. In this paper, the nanoindentation behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu amorphous/crystalline nanolaminates (ACNLs) is investiga...
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MDPI AG
2021-05-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/11/2756 |
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| author | Wen-Ping Wu Daniel Şopu Jürgen Eckert |
| author_facet | Wen-Ping Wu Daniel Şopu Jürgen Eckert |
| author_sort | Wen-Ping Wu |
| collection | DOAJ |
| description | Amorphous/crystalline nanolaminate composites have aroused extensive research interest because of their high strength and good plasticity. In this paper, the nanoindentation behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu amorphous/crystalline nanolaminates (ACNLs) is investigated by molecular dynamics (MD) simulation while giving special attention to the plastic processes occurring at the interface. The load–displacement curves of ACNLs reveal small fluctuations associated with shear transformation zone (STZ) activation in the amorphous layer, whereas larger fluctuations associated with dislocations emission occur in the crystalline layer. During loading, local STZ activation occurs and the number of STZs increases as the indentation depth in the amorphous layer increases. These STZs are mostly located around the indenter, which correlates to the high stresses concentrated around the indenter. When the indenter penetrates the crystalline layer, dislocations emit from the interface of amorphous/crystalline, and their number increases with increasing indentation depth. During unloading, the overall number of STZs and dislocations decreases, while other new STZs and dislocations become activated. These results are discussed in terms of stress distribution, residual stresses, indentation rate and indenter radius. |
| first_indexed | 2024-03-10T11:08:21Z |
| format | Article |
| id | doaj.art-6fe9651b39034b3e85c9d9cdfd85347d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:08:21Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-6fe9651b39034b3e85c9d9cdfd85347d2023-11-21T20:59:48ZengMDPI AGMaterials1996-19442021-05-011411275610.3390/ma14112756Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate CompositesWen-Ping Wu0Daniel Şopu1Jürgen Eckert2Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, ChinaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, AustriaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, AustriaAmorphous/crystalline nanolaminate composites have aroused extensive research interest because of their high strength and good plasticity. In this paper, the nanoindentation behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu amorphous/crystalline nanolaminates (ACNLs) is investigated by molecular dynamics (MD) simulation while giving special attention to the plastic processes occurring at the interface. The load–displacement curves of ACNLs reveal small fluctuations associated with shear transformation zone (STZ) activation in the amorphous layer, whereas larger fluctuations associated with dislocations emission occur in the crystalline layer. During loading, local STZ activation occurs and the number of STZs increases as the indentation depth in the amorphous layer increases. These STZs are mostly located around the indenter, which correlates to the high stresses concentrated around the indenter. When the indenter penetrates the crystalline layer, dislocations emit from the interface of amorphous/crystalline, and their number increases with increasing indentation depth. During unloading, the overall number of STZs and dislocations decreases, while other new STZs and dislocations become activated. These results are discussed in terms of stress distribution, residual stresses, indentation rate and indenter radius.https://www.mdpi.com/1996-1944/14/11/2756molecular dynamics (MD) simulationnanoindentationamorphous/crystalline nanolaminates (ACNLs)shear transformation zone (STZ)dislocation |
| spellingShingle | Wen-Ping Wu Daniel Şopu Jürgen Eckert Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites Materials molecular dynamics (MD) simulation nanoindentation amorphous/crystalline nanolaminates (ACNLs) shear transformation zone (STZ) dislocation |
| title | Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites |
| title_full | Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites |
| title_fullStr | Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites |
| title_full_unstemmed | Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites |
| title_short | Molecular Dynamics Study of the Nanoindentation Behavior of Cu<sub>64</sub>Zr<sub>36</sub>/Cu Amorphous/Crystalline Nanolaminate Composites |
| title_sort | molecular dynamics study of the nanoindentation behavior of cu sub 64 sub zr sub 36 sub cu amorphous crystalline nanolaminate composites |
| topic | molecular dynamics (MD) simulation nanoindentation amorphous/crystalline nanolaminates (ACNLs) shear transformation zone (STZ) dislocation |
| url | https://www.mdpi.com/1996-1944/14/11/2756 |
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