Transient nucleation in selective laser melting of Zr-based bulk metallic glass
The crystallization rate during selective laser melting (SLM) of bulk metallic glasses (BMG) is a critical factor in maintaining the material's amorphous structure. To increase the understanding of the interplay between the SLM process and the crystallization behavior of BMGs, a numerical model...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-10-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127520304925 |
| _version_ | 1828443047995637760 |
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| author | A. Ericsson V. Pacheco M. Sahlberg J. Lindwall H. Hallberg M. Fisk |
| author_facet | A. Ericsson V. Pacheco M. Sahlberg J. Lindwall H. Hallberg M. Fisk |
| author_sort | A. Ericsson |
| collection | DOAJ |
| description | The crystallization rate during selective laser melting (SLM) of bulk metallic glasses (BMG) is a critical factor in maintaining the material's amorphous structure. To increase the understanding of the interplay between the SLM process and the crystallization behavior of BMGs, a numerical model based on the classical nucleation theory has been developed that accounts for the rapid temperature changes associated with SLM. The model is applied to SLM of a Zr-based BMG and it is shown that the transient effects, accounted for by the model, reduce the nucleation rate by up to 15 orders of magnitude below the steady-state nucleation rate on cooling, resulting in less nuclei during the build process. The capability of the proposed modelling approach is demonstrated by comparing the resulting crystalline volume fraction to experimental findings. The agreement between model predictions and the experimental results clearly suggests that transient nucleation effects must be accounted for when considering the crystallization rate during SLM processing of BMGs. |
| first_indexed | 2024-12-10T21:23:32Z |
| format | Article |
| id | doaj.art-fc190693bb0e4d29b78bd732645f23a6 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-10T21:23:32Z |
| publishDate | 2020-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-fc190693bb0e4d29b78bd732645f23a62022-12-22T01:33:04ZengElsevierMaterials & Design0264-12752020-10-01195108958Transient nucleation in selective laser melting of Zr-based bulk metallic glassA. Ericsson0V. Pacheco1M. Sahlberg2J. Lindwall3H. Hallberg4M. Fisk5Division of Solid Mechanics, Lund University, PO Box 118, SE 22100 Lund, Sweden; Corresponding author.Department of Chemistry, Ångström Laboratory, Uppsala University, Box 523, SE 75120 Uppsala, SwedenDepartment of Chemistry, Ångström Laboratory, Uppsala University, Box 523, SE 75120 Uppsala, SwedenMechanics of Solid Materials, Luleå Technical University, SE 97187 Luleå, SwedenDivision of Solid Mechanics, Lund University, PO Box 118, SE 22100 Lund, SwedenDivision of Solid Mechanics, Lund University, PO Box 118, SE 22100 Lund, Sweden; Materials Science and Applied Mathematics, Malmö University, SE 20506 Malmö, SwedenThe crystallization rate during selective laser melting (SLM) of bulk metallic glasses (BMG) is a critical factor in maintaining the material's amorphous structure. To increase the understanding of the interplay between the SLM process and the crystallization behavior of BMGs, a numerical model based on the classical nucleation theory has been developed that accounts for the rapid temperature changes associated with SLM. The model is applied to SLM of a Zr-based BMG and it is shown that the transient effects, accounted for by the model, reduce the nucleation rate by up to 15 orders of magnitude below the steady-state nucleation rate on cooling, resulting in less nuclei during the build process. The capability of the proposed modelling approach is demonstrated by comparing the resulting crystalline volume fraction to experimental findings. The agreement between model predictions and the experimental results clearly suggests that transient nucleation effects must be accounted for when considering the crystallization rate during SLM processing of BMGs.http://www.sciencedirect.com/science/article/pii/S0264127520304925Additive manufacturingSelective laser meltingMetallic glassCrystallizationClassical nucleation theoryTransient nucleation |
| spellingShingle | A. Ericsson V. Pacheco M. Sahlberg J. Lindwall H. Hallberg M. Fisk Transient nucleation in selective laser melting of Zr-based bulk metallic glass Materials & Design Additive manufacturing Selective laser melting Metallic glass Crystallization Classical nucleation theory Transient nucleation |
| title | Transient nucleation in selective laser melting of Zr-based bulk metallic glass |
| title_full | Transient nucleation in selective laser melting of Zr-based bulk metallic glass |
| title_fullStr | Transient nucleation in selective laser melting of Zr-based bulk metallic glass |
| title_full_unstemmed | Transient nucleation in selective laser melting of Zr-based bulk metallic glass |
| title_short | Transient nucleation in selective laser melting of Zr-based bulk metallic glass |
| title_sort | transient nucleation in selective laser melting of zr based bulk metallic glass |
| topic | Additive manufacturing Selective laser melting Metallic glass Crystallization Classical nucleation theory Transient nucleation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127520304925 |
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