期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 685, 期 -, 页码 91-96出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.05.234
关键词
SiC; Al4C3; Phase transformation; Diffusion; Composites
资金
- National Natural Science Foundation of China [51271101, 51571133]
The in situ synthesis of SiC particles in Al melt is reasonably difficult since carbon has quite poor wettability and extremely tiny solubility in the melt. A liquidesolid reaction couple was designed in this paper. Si atoms diffuse into Al4C3 phase, resulting in the gradual transformation Al4C3 -> Al4SiC4 -> SiC. The concentration of Si is a key factor affecting the transformation procedure, and SiC can only be synthesized at a relatively high Si content. By applying the mechanism into casting method, SiCp reinforced Al-18Si alloys were successfully prepared, and the hardness, wear resistance and tensile properties were improved. The method provides a novel suggestion for the preparation of in situ SiC particles reinforced Al-Si matrix composites. (C) 2016 Elsevier B.V. All rights reserved.
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