The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites
Abstract
:1. Introduction
2. Experimental Methods
3. Results and Discussion
3.1. Morphology of TiAl Ball-Milled Powders
3.2. Reaction Mechanism of (Ti2AlC + Al2O3)p/TiAl Composites
3.3. Microstructure of (Ti2AlC + Al2O3)p/TiAl Composites
3.4. Mechanical Properties of (Ti2AlC + Al2O3)p/TiAl Composites
4. Conclusions
- (1)
- When the ball-milling powder is milled without adding stearic acid, resulting from severe cold welding of ductile Al powder, the ball-milled product adheres to the surface of the milling vial and grinding balls. With the stearic acid added initially, the powder yields nearly 100%.
- (2)
- The TG-DSC and XRD curves indicate that the C and O elements of stearic acid participate in the TiAl reaction system, and the H element of stearic acid is involved in H2↑ release during the sintering process. And for the sample without added stearic acid, the XRD patterns only consist of the γ-TiAl phase and the α2-Ti3Al phase. While, for the composites that added stearic acid as a process control agent in the ball-milling process, the Ti2AlC and Al2O3 patterns appear besides the γ-TiAl and α2-Ti3Al patterns.
- (3)
- The microstructure of TiAl composites is mainly composed of equiaxed TiAl and Ti3Al grains. While for the TiAl composites with stearic acid, the Ti2AlC and Al2O3 particles are distributed at TiAl grain boundaries, a few Ti2AlC particles are distributed at the TiAl/Ti3Al interface and in the Ti3Al phase. Additionally, γ/α2 lamellar and γ/γ twin grains can be found in the TEM result.
- (4)
- With the addition of stearic acid, the microhardness, the compression stress, and the fracture strain increase first and then decrease. The composite with the best comprehensive mechanical properties is (Ti2AlC + Al2O3)p/TiAl composite with 2 wt.% stearic acid; the microhardness, the compression stress, and the fracture strain are 7.7 GPa, 1590 MPa, and 24.3%. The improved strength of the TiAl composites results from refined TiAl grains and twin grain boundaries; the improved toughness is mainly caused by crack deflection, reinforced particle pull-out, and pinning.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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The Amount of Stearic Acid Added | 0 wt.% | 1 wt.% | 2 wt.% | 3 wt.% |
---|---|---|---|---|
Sample weight (g) | 10.02 | 9.93 | 10.03 | 10.00 |
Density (g/cm3) | 3.90 | 3.86 | 3.91 | 3.89 |
Element\at% | Point 1 | Point 2 | Point 3 |
---|---|---|---|
Ti | 43.6% | 60.1% | 43.2% |
Al | 41.6% | 23.8% | 28.1% |
C | 12.6% | 10.2% | 20.2% |
O | 2.2% | 5.9% | 8.5% |
Additive Content of Stearic Acid wt.% | MPa | MPa | Strain |
---|---|---|---|
0 | 266 | 850 | 0.221 |
1 | 542 | 1574 | 0.238 |
2 | 538 | 1590 | 0.243 |
3 | 464 | 1234 | 0.223 |
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Zhu, J.; Yuan, M.; Pei, X.; Zhou, X.; Li, M. The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites. Metals 2024, 14, 392. https://doi.org/10.3390/met14040392
Zhu J, Yuan M, Pei X, Zhou X, Li M. The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites. Metals. 2024; 14(4):392. https://doi.org/10.3390/met14040392
Chicago/Turabian StyleZhu, Jiawei, Meini Yuan, Xin Pei, Xiaosheng Zhou, and Maohua Li. 2024. "The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites" Metals 14, no. 4: 392. https://doi.org/10.3390/met14040392