期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep30874
关键词
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资金
- China National Funds for Distinguished Young Scientists [51125002]
- NSFC of China [51125002, 51101121, 51134011, 51431008, 51371147]
- National Basic Research Program of China (973 program) [2011CB610403]
- Fundamental Research Fund of NWPU [3102014JCQ01025]
- New Century Excellent Person Supporting Project [NCET-13-0470]
- Research Fund of the State Key Lab. of Solidification Processing (NWPU) [146-QZ-2016]
- Fundamental Research Funds for the Central Universities [3102014JCQ01025, 3102015BJ(II)ZS001]
Al-Si-based casting alloys have a great potential in various industrial applications. Common strengthening strategies on these alloys are accompanied inevitably by sacrifice of ductility, known as strength-ductility trade-off dilemma. Here, we report a simple route by combining rapid solidification (RS) with a post-solidification heat treatment (PHT), i.e. a RS + PHT route, to break through this dilemma using a commercial Al-Si-based casting alloy (A356 alloy) as an example. It is shown that yield strength and elongation to failure of the RS + PHT processed alloy are elevated simultaneously by increasing the cooling rate upon RS, which are not influenced by subsequent T6 heat treatment. Breaking through the dilemma is attributed to the hierarchical microstructure formed by the RS + PHT route, i.e. highly dispersed nanoscale Si particles in Al dendrites and nanoscale Al particles decorated in eutectic Si. Simplicity of the RS + PHT route makes it being suitable for industrial scaling production. The strategy of engineering microstructures offers a general pathway in tailoring mechanical properties of other Al-Si-based alloys. Moreover, the remarkably enhanced ductility of A356 alloy not only permits strengthening further the material by work hardening but also enables possibly conventional solid-state forming of the material, thus extending the applications of such an alloy.
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