Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure
3.2. DSC Analysis
3.3. TEM Observations
3.4. Mechanical Properties
3.5. Strengthening of TiC/2219 Nanocomposite
3.6. Fracture Behavior
4. Conclusions
- (1)
- After solution aging, usually very few sub-grains would exist in the matrix for the 2219 alloy. However, there were still many sub-grains in composites with 1.3 wt.% TiC and 1.7 wt.% TiC as shown in the EBSD.
- (2)
- An appropriate amount of TiC nanoparticles could promote the dissolution of Al2Cu particles during heat treatment. With increasing TiC nanoparticle content from 0 wt.% to 0.9 wt.%, the area fraction of the Al2Cu phases decreased from 2.19% to 0.26% due to dissolution into the matrix. However, with increasing TiC nanoparticle content from 1.3 wt.% to 1.7 wt.%, the area fraction of the Al2Cu phases increased from 0.83% to 1.16%.
- (3)
- For the forged and heat-treated composites, the addition of TiC nanoparticles facilitated the precipitation of θ″ and θ′ phases during aging. At a nanoparticle content of 0.9 wt.%, the largest amounts of θ″ and the θ′ phases precipitated in the matrix. However, with a further increase in TiC nanoparticles content, the precipitation of the precipitated phase was inhibited. When TiC nanoparticles entered the Al matrix, it inevitably caused crystal lattice distortion and increased the system’s energy. To maintain low system energy, more oversaturated vacancies might aggregate around the TiC nanoparticles. This was the reason for the many precipitates in the 0.9 wt.% TiC/2219 nanocomposite.
- (4)
- The mechanical properties of the forged and heat-treated 0.9 wt.% TiC/2219 nanocomposite were better than those of the 2219 alloy and other composites. The tensile strength, yield strength, and elongation of the forged 0.9 wt.% TiC/2219 nanocomposite increased by 24.2%, 46.1%, and 37.2%, respectively, than those of the forged 2219 alloy.
Author Contributions
Funding
Conflicts of Interest
References
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TiC (wt.%) | σ0.2 (MPa) | σUTS (MPa) | δf (%) |
---|---|---|---|
0 | 206 | 331 | 8.6 |
0.5 | 232 | 355 | 9.4 |
0.9 | 301 | 411 | 11.8 |
1.3 | 267 | 389 | 9.1 |
1.7 | 244 | 374 | 7.7 |
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Yang, Y.; Jiang, R.; Li, X.; Zhang, Y.; Li, R. Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites. Metals 2019, 9, 982. https://doi.org/10.3390/met9090982
Yang Y, Jiang R, Li X, Zhang Y, Li R. Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites. Metals. 2019; 9(9):982. https://doi.org/10.3390/met9090982
Chicago/Turabian StyleYang, Yilong, Ripeng Jiang, Xiaoqian Li, Yun Zhang, and Ruiqing Li. 2019. "Effect of Nanoparticle Content on the Microstructural and Mechanical Properties of Forged and Heat-Treated TiC/2219 Nanocomposites" Metals 9, no. 9: 982. https://doi.org/10.3390/met9090982