Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 596, Issue -, Pages 98-102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.12.049
Keywords
Nano-sized TiN particle; Al-Cu matrix composite; Microstructure; Strength; Ductily
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Funding
- National Natural Science Foundation of China [51171071]
- National Basic Research Program of China (973 Program) [2012CB619600]
- NNSFC [50971065, 50531030]
- Project 985-High Performance Materials of Jilin University
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The microstructures and tensile properties of Ni coated nano-sized TiN particle reinforced Al-Cu matrix composites via casting were studied. It was found that with the increase of the TiN particle addition, the average size of the alpha-Al grains decreases. The nano-sized TiN particles enclosed inside the alpha-Al grains provide some heterogeneous nucleation sites during solidification, resulting in a more refined microstructure. Moreover, the theta' precipitates in the composites matrix were much finer and more uniformly distributed. After T6 heat treatment, the strength and ductility of the composites increase simultaneously. The yield strength, ultimate strength and elongation of the 2.0 wt% nano-sized TiNp/Al-Cu composite can reach to 365 MPa, 594 MPa and 13.5%, increased by 20.5%, 22.5% and 104.5% respectively from those of the Al-Cu matrix alloy (303 MPa, 485 MPa and 6.6%). (C) 2013 Elsevier B.V. All rights reserved.
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