期刊
COMPOSITES PART B-ENGINEERING
卷 147, 期 -, 页码 162-168出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2018.04.026
关键词
Selective laser melting; TiB2/Al-Cu-Mg-Si composite; Heat treatment; Microstructure Mechanical properties
资金
- China Scholarship Council
- European Research Council under the ERC Advanced Grant INTELHYB [ERC-2013-ADG-340025]
A heat treatable TiB2/Al-3.5Cu-1.5Mg-1Si composite was successfully fabricated by selective laser melting (SLM). The results show that the Q phase forms in the matrix of the as-fabricated TiB2/Al-3.5Cu-1.5Mg-1Si composite. After T6 heat treatment, the Q phase disappears and the AlxMny, Mg2Si and Al2Cu(Mg) phases are formed. The same results can be observed before and after heat treatment in the unreinforced Al-Cu-Mg-Si alloy. EBSD and TEM analyses indicate that the addition of the TiB2 particles results in a remarkable grain refinement, leading to enhanced strength of the TiB2/Al-Cu-Mg-Si composite in comparison to the unreinforced Al-Cu-Mg-Si alloy in both the as-fabricated and heat-treated conditions. Both grain refinement and Orowan strengthening contribute to the high strength of the heat treated TiB2/Al-Cu-Mg-Si composite.
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