期刊
MATERIALS CHARACTERIZATION
卷 159, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2019.110019
关键词
Al matrix composite; In-situ scanning electronic microscopy; Diffusion; Phase transformation; Mechanical properties
类别
资金
- National Key Research and Development Program of China [2018YFB1106302, 2017WAMC002]
- Anhui Province Engineering Research Center of Aluminum Matrix Composites (China)
The microstructures evolution of nano TiB2/7050Al composite during homogenization was studied by in-situ scanning electronic microscopy, transmission electron microscope, energy dispersive spectrometer, electron backscattered diffraction and differential scanning calorimeter. The results showed that many secondary phases (SPs) and TiB2 particles coexisted at grain boundaries (GBs). These SPs mainly consisted of S(Al2CuMg) phase and T(Mg(Zn, Cu, Al)(2)) phase. During homogenization, a transformation from T to S phase occurred, and the homogenization was hindered. Furthermore, the strip-type arrangement of TiB2 at Type-I GBs should accelerate homogenization. Comparably, the shell-type arrangement of TiB2 at Type-II GBs can decelerate homogenization, since the aggregated SPs were hard to be dissolved herein. To clarify the effects of the phase transformation and particles arrangement on the homogenization, a modified diffusion model was proposed. Besides, the Vickers hardness increased and the electronic conductivity decreased with the elevated homogenization temperature and prolonged holding duration. Therefore, a multiple-stage homogenization process should be reasonable for nano TiB2/7050 Al composite.
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