Study on In-Situ Synthesis Process of Ti–Al Intermetallic Compound-Reinforced Al Matrix Composites
Abstract
:1. Introduction
2. Experiment
3. Experimental Results and Analysis
3.1. Milling Time
3.2. Consolidation and Sintering Process
3.3. Hardness and Density
3.4. Compression Performance
4. Conclusions
- (1)
- A typical core–shell-like structure is produced in the Ti–Al intermetallic compound-reinforced Al matrix composites prepared by ball-milling and in-situ reaction. The outer layer of the shell structure is TiAl3, and the inner layer is Ti3Al; these species have good bonding strength and compatibility with the Al matrix and Ti core, respectively.
- (2)
- The shell is composed of a series of Ti–Al intermetallic compounds. In cold-pressing sintering, the shell thickness increases with increased milling time in ball-milling and holding time in sintering. In hot-pressing sintering, the combined action of pressure and temperature induces an in-situ reaction. The Ti–Al intermetallic compounds around the adjacent Ti cores extend and form a small connecting region.
- (3)
- The closed shell structure formed in cold-pressing sintering and the radiating cracks running through the shell structure in hot-pressing sintering are the major differences in the structure of the reinforcement. The radiating cracks that occur in hot-pressing sintering provide paths for further diffusion and enhance the Kirkendall effect, which results in more cavities and decreases the density degree.
- (4)
- From the results of this study, the holding time has a more significant effect on the hardness and ductility of the fabricated composites than the milling time.
Author Contributions
Funding
Conflicts of Interest
References
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Sample Mark | Mill Time (h) | Consolidation and Sintering Process | Holding Time in Sintering (h) |
---|---|---|---|
A | 3 | cold pressing | / |
B | 3 | cold-pressing sintering | 1.0 |
C | 8 | cold-pressing sintering | 1.0 |
D | 3 | cold-pressing sintering | 1.5 |
E | 8 | hot-pressing sintering | 1.0 |
Specimens | Measured Value | Mean Value | ||||
---|---|---|---|---|---|---|
B | 2.514 | 2.435 | 2.623 | 2.605 | 2.464 | 2.528 |
C | 2.543 | 2.456 | 2.598 | 2.615 | 2.514 | 2.545 |
D | 2.561 | 2.486 | 2.551 | 2.611 | 2.538 | 2.549 |
E | 2.373 | 2.366 | 2.382 | 2.410 | 2.392 | 2.384 |
Specimens | Sintering Densification |
---|---|
B | 88.1% |
C | 88.7% |
D | 88.8% |
E | 83.1% |
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Wan, Q.; Li, F.; Wang, W.; Hou, J.; Cui, W.; Li, Y. Study on In-Situ Synthesis Process of Ti–Al Intermetallic Compound-Reinforced Al Matrix Composites. Materials 2019, 12, 1967. https://doi.org/10.3390/ma12121967
Wan Q, Li F, Wang W, Hou J, Cui W, Li Y. Study on In-Situ Synthesis Process of Ti–Al Intermetallic Compound-Reinforced Al Matrix Composites. Materials. 2019; 12(12):1967. https://doi.org/10.3390/ma12121967
Chicago/Turabian StyleWan, Qiong, Fuguo Li, Wenjing Wang, Junhua Hou, Wanyue Cui, and Yongsheng Li. 2019. "Study on In-Situ Synthesis Process of Ti–Al Intermetallic Compound-Reinforced Al Matrix Composites" Materials 12, no. 12: 1967. https://doi.org/10.3390/ma12121967