Abstract
Aluminum matrix composites have been widely used in aerospace and automotive fields due to their excellent physical properties. Cryogenic treatment was successfully adopted to improve the performance of aluminum alloy components, while its effect and mechanism on the aluminum matrix composite remained unclear. In this work, the effects of cryogenic treatment on the microstructure evolution and mechanical properties of 15%SiCp/2009 aluminum matrix composites were systematically investigated by means of Thermoelectric Power (TEP), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The results showed that TEP measurement can be an effective method for evaluating the precipitation characteristics of 15%SiCp/2009 aluminum matrix composites during aging. The addition of cryogenic treatment after solution and before aging treatment promoted the precipitation from the beginning stage of aging. Furthermore, the aging time for the maximum precipitation of the θ″ phase was about 4 h advanced, as the conduction of cryogenic treatment accelerates the aging kinetics. This was attributed to the great difference in the linear expansion coefficient between the aluminum alloy matrix and SiC-reinforced particles, which could induce high internal stress in their boundaries for precipitation. Moreover, the lattice contraction of the aluminum alloy matrix during cryogenic treatment led to the increase in dislocation density and micro defects near the boundaries, thus providing more nucleation sites for precipitation during the aging treatment. After undergoing artificial aging treatment for 20 h, the increase in dispersive, distributed precipitates after cryogenic treatment improved the hardness and yield strength by 4% and 16 MPa, respectively.
Funder
Natural Science Foundation of Beijing
Projects for National Science and Technology Institutes of China
Subject
General Materials Science
Reference33 articles.
1. A Consequence of Reinforcements In Aluminum-based Metal Matrix Composites: A Literature Review;Rathod;Metall. Mater. Eng.,2019
2. Lakshmikanthan, A., Angadi, S., Malik, V., Saxena, K., Prakash, C., Dixit, S., and Mohammed, K.A. (2022). Mechanical and Tribological Properties of Aluminum-Based Metal-Matrix Composites. Materials, 15.
3. Microstructure and mechanical properties of 7075 Al alloy based composites with Al2O3 nanoparticles;Wu;Int. J. Cast Met. Res.,2017
4. Microstructure and Mechanical Properties of Aluminum Matrix Composites Reinforced With In-Situ TiB2 Particles;Wu;Front. Mater.,2022
5. The Dependence of the Strength of a Carbon Fiber/Aluminum Matrix Composite on the Interface Shear Strength between the Matrix and Fiber;Galyshev;Materials,2022
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献