J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (6): 596-602.DOI: 10.1016/j.jmst.2016.05.004
Special Issue: 2017腐蚀与防护专辑
• Orginal Article • Previous Articles
Li Xichao1,2, Zheng Lili1, Qian Yuhai1, Xu Jingjun1, Li Meishuan1()
Received:
2016-03-21
Revised:
2016-05-03
Accepted:
2016-05-12
Online:
2017-06-20
Published:
2017-08-22
About author:
These authors contributed equally to this work.
Li Xichao, Zheng Lili, Qian Yuhai, Xu Jingjun, Li Meishuan. Effects of High Temperature Oxidation on Mechanical Properties of Ti3AlC2[J]. J. Mater. Sci. Technol., 2017, 33(6): 596-602.
Fig. 3. Cumulative AE event counts, amplitude and load as a function of time during three-point bending for Ti3AlC2 samples (a) unoxidized and (b) oxidized at 1200 °C in air for 48 h, (a′) and (b′) peak frequency corresponding to (a) and (b) respectively.
Fig. 5. Three-point-bending fracture appearances of Ti3AlC2 samples oxidized at 1100 °C for (a) 48 h and (b) 360 h, and at 1200 °C for (c) 48 h and (d) 360 h.
Condition | Oxidation time (h) | Oxide thickness (μm) | Flexural strength (MPa) | Surface hardness (GPa) | ||
---|---|---|---|---|---|---|
With oxide | Oxide removed | With oxide | Oxide removed | |||
Unoxidized | - | - | - | 345 ± 10 | - | 3.1 ± 0.2 |
1100 °C | 48 | 3.6 ± 0.2 | 329 ± 18 | 347 ± 20 | 3.4 ± 0.3 | 2.9 ± 0.1 |
360 | 7.9 ± 0.2 | 327 ± 3 | 343 ± 17 | 6.0 ± 0.5 | 3.0 ± 0.1 | |
1200 °C | 48 | 5.6 ± 0.4 | 326 ± 4 | 345 ± 14 | 4.1 ± 0.2 | 3.0 ± 0.2 |
360 | 11.2 ± 0.6 | 327 ± 3 | 345 ± 30 | 6.9 ± 0.5 | 2.7 ± 0.3 |
Table 1 Flexural strength, surface hardness and oxide thickness of Ti3AlC2 after oxidation under different conditions
Condition | Oxidation time (h) | Oxide thickness (μm) | Flexural strength (MPa) | Surface hardness (GPa) | ||
---|---|---|---|---|---|---|
With oxide | Oxide removed | With oxide | Oxide removed | |||
Unoxidized | - | - | - | 345 ± 10 | - | 3.1 ± 0.2 |
1100 °C | 48 | 3.6 ± 0.2 | 329 ± 18 | 347 ± 20 | 3.4 ± 0.3 | 2.9 ± 0.1 |
360 | 7.9 ± 0.2 | 327 ± 3 | 343 ± 17 | 6.0 ± 0.5 | 3.0 ± 0.1 | |
1200 °C | 48 | 5.6 ± 0.4 | 326 ± 4 | 345 ± 14 | 4.1 ± 0.2 | 3.0 ± 0.2 |
360 | 11.2 ± 0.6 | 327 ± 3 | 345 ± 30 | 6.9 ± 0.5 | 2.7 ± 0.3 |
Fig. 8. SEM images of the indentations on the surfaces of Ti3AlC2 samples with and without oxide scales after oxidation at 1100 °C for (a, a′) 48 h and (b, b′) 360 h, and at 1200 °C for (c, c′) 48 h and (d, d′) 360 h, respectively.
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