YAN Hong-ge1，2, HU Cheng-jin1，2, CHEN Ji-hua1，2, SU Bin1，2
(1.College of Materials Science and Engineering, Hunan Univ, Changsha，Hunan410082, China;2.Hunan Province Key Laboratory of Spray Deposition Technology and Application, Changsha,Hunan410082,China） 在知网中查找 在百度中查找 在本站中查找
The high temperature tensile properties and room-temperature mechanical properties of 2024Al/Gr/SiCp hybrid composites after long time thermal exposure were studied. The fractures of 2024Al/Gr/SiCp hybrid composites after a long time of thermal exposure at different temperatures were observed by SEM. The results show that the mechanical properties of 2024Al/Gr/SiCp hybrid composites decrease slightly with the increase of exposure time at 200 ℃. The 2024Al shows a greater decline of mechanical properties than the composites, which is attributed to the addition of SiCp particles and flaky graphite. The mechanical properties of the materials decrease rapidly due to the coarsening of precipitates and grain. The tensile strength at elevated temperatures decreases with the increase of test temperature. The 2024Al is characterized by ductile fracture, while the composites are characterized by the ductile fracture of matrix, the tearing of the graphite and the interface between the particles and matrix.
