期刊
JOURNAL OF MATERIALS SCIENCE
卷 55, 期 14, 页码 6145-6160出版社
SPRINGER
DOI: 10.1007/s10853-020-04381-4
关键词
-
资金
- Equipment Advance Research Fund [61409220102]
- Student's Platform for Innovation and Entrepreneurship Training Program in Tianjin University [201910056053]
In terms of aluminum alloy matrix composites, the effect of reinforcement on precipitation is worth investigating. In this work, the silicon carbide nanoparticles-reinforced 7075Al (SiCnp/7075Al) composite was fabricated through a series of powder metallurgy procedures, shift-speed ball milling, hot pressing, and hot extrusion, and the precipitation behavior of SiCnp/7075Al composite was compared with that of 7075Al alloy after T6 treatment. The results show that only a small addition (1 vol%) of SiCnp modifies the morphology and dispersion of precipitates. The uniformly dispersed small precipitates (eta ' phase) and increased dislocation density have a positive influence on the mechanical properties of composites. Based on the fracture surface and element composition, a fracture mode dominated by precipitated phase-induced crack initiation was proposed. This study suggests a promising approach to design the alloy matrix composites through controlling the behavior of precipitated phases with nano-reinforcement.
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