期刊
METALS AND MATERIALS INTERNATIONAL
卷 23, 期 1, 页码 193-201出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-017-6363-z
关键词
composites; hot working; microstructure; tensile test; powder thixoforming
资金
- Basic Scientific Fund of Gansu University [G2014-07]
- Program for New Century Excellent Talents in the University of China [NCET-10-0023]
- Program for Hongliu Outstanding Youth of Lanzhou University Of Technology
The present investigation addresses a new technology, named powder thixoforming, used to fabricate SiCp/2024 Al-based composites. The effects of reheating time on microstructure and mechanical properties have been studied. The results indicated that the quantity of liquid, the coarsening behavior of the primary particles, the subsequent plastic deformation occurring during thixoforging, and thus the resulting microstructural compactness and mechanical properties changed as a function of reheating time. The best comprehensive tensile properties of the composite, that is an ultimate tensile strength of 370 MPa and an elongation of 4.4%, were obtained after reheating for 80 min at 625 degrees C, which was an increase of 23.3% and a decrease of 57.7%, respectively, compared to the 2024 alloy thixoforged under the same conditions as the composite. The fracturing in the composites occurred through interconnecting cracked SiCp and debonded SiC/Al interfaces caused by a higher concentration of stress and a coalescence of microvoids.
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