Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 36, Issue -, Pages 18-26Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.03.047
Keywords
Selective laser melting; Aluminum alloys; Bimetals; Microstructure; Mechanical properties
Funding
- Shenzhen Peacock Innovation Project [KQJSCX20170327150948772, KQJSCX20170727101223535, KQJSCX20170327151307811]
- Key Project Fund for Science and Technology Development of Guangdong Province [2017B090911014]
- European Research Council (ERC) [ERC-2013-ADG-340025]
- National Natural Science Foundation of China [51771123]
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An Al-12Si/Al-3.5Cu-1.5Mg-1Si bimetal with a good interface was successfully produced by selective laser melting (SLM). The SLM bimetal exhibits four successive zones along the building direction: an Al-12Si zone, an interfacial zone, a texture-strengthening zone and an Al-Cu-Mg-Si zone. The interfacial zone (< 0.2 mm thick) displays an increasing size of the cells composed of eutectic Al-Si and a discontinuous cellular microstructure, resulting in the lowest hardness of the four zones. The texture-strengthening zone (around 0.3 mm thick) shows a remarkable variation of the hardness and <001> fiber texture. Electron backscatter diffraction analysis shows that the grains grow gradually from the interfacial zone to the Al-Cu-Mg-Si zone along the building direction. Additionally, a strong <001> fiber texture develops at the Al-Cu-Mg-Si side of the interfacial zone and disappears gradually along the building direction. The bimetal exhibits a room temperature yield strength of 267 +/- 10 MPa and an ultimate tensile strength of 369 +/- 15 MPa with elongation of 2.6% +/- 0.1%, revealing the potential of selective laser melting in manufacturing dissimilar materials. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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