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| Effect of Sn Content on Micro Molten Pool Microstructure and Mechanical Properties of Selective Laser Melted Cu Alloys |
| Received:November 23, 2020 Revised:December 08, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.05.015 |
| KeyWord:copper alloy; nonferrous metals; molten pool; selective laser melting; mechanical property |
| Author | Institution |
| LI Xiao-xuan |
北京工业大学材料与制造学部 |
| WANG Zeng-jie |
北京工业大学材料与制造学部 |
| HE Ding-yong |
北京工业大学材料与制造学部 |
| PAN Run-peng |
北京工业大学材料与制造学部 |
| Liu Xuan |
北京科技大学冶金与生态工程学院 |
| XUE Ji-lai |
北京科技大学冶金与生态工程学院 |
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| Abstract: |
| Selective Laser Melting (SLM) was used to prepare Cu-Sn alloys with optimized parameters such as laser power, scanning speed and hatching space and forming density of SLM built Cu-5%Sn, Cu-15%Sn and Cu-24.6%Sn (mass fraction) reaches 99.2%, 99.7%, and 99.7% respectively. It is found that solidification phase transformation and microstructure show non-equilibrium characteristics. α phase Cu-5%Sn alloy contains mainly α-Cu(Sn) solid solution phase, while α phase Cu-15%Sn alloy is composed of α-Cu(Sn) and δ-Cu41Sn11 phases, and β phase Cu-24.6%Sn alloy has partially decomposed to γ and δ phases. As Sn content rises from 5% to 15%, tensile strength increases from 384 MPa to 695 MPa, while fracture extension drops from 22.7% to 12%. No obvious preferred orientation exists in α Cu-Sn alloys, while texture parallel to building direction of SLM appears in β Cu-24.6%Sn alloy with strong anisotropy in tensile properties. |
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