J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (5): 799-805.DOI: 10.1016/j.jmst.2017.04.012
• Orginal Article • Previous Articles Next Articles
H.J. Zhoua, F. Xuea, H. Changb, Q. Fenga()
Received:
2016-10-08
Revised:
2017-01-11
Accepted:
2017-02-17
Online:
2018-05-10
Published:
2018-05-04
H.J. Zhou, F. Xue, H. Chang, Q. Feng. Effect of Mo on microstructural characteristics and coarsening kinetics of γ' precipitates in Co-Al-W-Ta-Ti alloys[J]. J. Mater. Sci. Technol., 2018, 34(5): 799-805.
Alloy | Co | Al | W | Ta | Ti | Mo |
---|---|---|---|---|---|---|
A | Bal. | 7 | 7 | 2 | 4 | - |
B | Bal. | 7 | 6 | 2 | 4 | 1 |
Table 1 Nominal compositions of experimental alloys (at.%).
Alloy | Co | Al | W | Ta | Ti | Mo |
---|---|---|---|---|---|---|
A | Bal. | 7 | 7 | 2 | 4 | - |
B | Bal. | 7 | 6 | 2 | 4 | 1 |
Temperature (°C) | Time (h) | |||||
---|---|---|---|---|---|---|
8 | 50 | 300 | 600 | 1000 | 2000 | |
900 | √ | √ | √ | √ | ||
1000 | √ | √ | √ | √ | √ | |
1050 | √ | √ | √ | √ | √ | √ |
1100 | √ | √ | √ |
Table 2 Specific isothermal aging temperatures and time.
Temperature (°C) | Time (h) | |||||
---|---|---|---|---|---|---|
8 | 50 | 300 | 600 | 1000 | 2000 | |
900 | √ | √ | √ | √ | ||
1000 | √ | √ | √ | √ | √ | |
1050 | √ | √ | √ | √ | √ | √ |
1100 | √ | √ | √ |
Alloy | γ' solvus temperature (°C) |
---|---|
Co-7Al-7W-4Ti-2Ta (A) | 1157 |
Co-7Al-6W-4Ti-2Ta-1Mo (B) | 1143 |
Co-9Al-10W [ | 1029 |
Co-9Al-10W-2Mo [ | 1018 |
Co-9Al-7W [ | 965 |
Co-9Al-7W-2Mo [ | 977 |
Co-9Al-8W-2Ta [ | 1087 |
Co-9Al-8W-2Ta-2Mo [ | 1082 |
Table 3 γ' solvus temperature in the current and reported Co-base alloys (at.%).
Alloy | γ' solvus temperature (°C) |
---|---|
Co-7Al-7W-4Ti-2Ta (A) | 1157 |
Co-7Al-6W-4Ti-2Ta-1Mo (B) | 1143 |
Co-9Al-10W [ | 1029 |
Co-9Al-10W-2Mo [ | 1018 |
Co-9Al-7W [ | 965 |
Co-9Al-7W-2Mo [ | 977 |
Co-9Al-8W-2Ta [ | 1087 |
Co-9Al-8W-2Ta-2Mo [ | 1082 |
Fig. 3. Typical microstructure of γ? precipitates in (a) alloy A and (b) alloy B after (a1) and (b1) aging in 1000 °C for 300 h and re-aging at (a2) 1167 °C (a3) 1147 °C (b2) 1153 °C and (b3) 1133 °C for 2 h.
Fig. 4. Typical microstructure of γ? precipitates in alloy A after aging in the temperature range from 900 to 1100 °C for different time period from 50 to 1000 h: (a) 900 °C, (b) 1000 °C, (c) 1050 °C, (d) 1100 °C, (1) 50 h, (2) 300 h, (3) 1000 h.
Fig. 5. Typical microstructure of γ? precipitates in alloy B after aging in the temperature range of 900 °C and 1100 °C for different time period from 50 to 1000 h: (a) 900 °C, (b) 1000 °C, (c) 1050 °C, (d) 1100 °C, (1) 50 h, (2) 300 h, (3) 1000 h.
Fig. 6. Volume fraction of γ' precipitates in two experimental alloys after aging in the temperature range of 900 °C and 1100 °C for different time period from 8 to 2000 h.
Alloy | Co | Al | W | Ti | Ta | Mo | |
---|---|---|---|---|---|---|---|
A | Cxγ | 84.08 ± 0.30 | 7.14 ± 0.19 | 5.05 ± 0.05 | 2.80 ± 0.06 | 0.97 ± 0.09 | - |
Cxγ' | 78.99 ± 0.42 | 6.61 ± 0.18 | 8.02 ± 0.06 | 4.51 ± 0.04 | 1.88 ± 0.14 | - | |
Kxγ'/γ | 0.94 ± 0.00 | 0.93 ± 0.03 | 1.59 ± 0.02 | 1.61 ± 0.03 | 1.96 ± 0.20 | - | |
B | Cxγ | 83.66 ± 0.22 | 7.18 ± 0.08 | 4.41 ± 0.14 | 2.85 ± 0.05 | 0.99 ± 0.14 | 0.91 ± 0.01 |
Cxγ' | 78.87 ± 0.40 | 6.67 ± 0.13 | 6.88 ± 0.05 | 4.48 ± 0.08 | 2.16 ± 0.35 | 0.94 ± 0.02 | |
Kxγ'/γ | 0.94 ± 0.00 | 0.93 ± 0.02 | 1.56 ± 0.04 | 1.57 ± 0.03 | 2.21 ± 0.43 | 1.03 ± 0.02 |
Table 4 Compositions of γ and γ' phases measured by EPMA and partition coefficient Kxγ'/γ of each element.
Alloy | Co | Al | W | Ti | Ta | Mo | |
---|---|---|---|---|---|---|---|
A | Cxγ | 84.08 ± 0.30 | 7.14 ± 0.19 | 5.05 ± 0.05 | 2.80 ± 0.06 | 0.97 ± 0.09 | - |
Cxγ' | 78.99 ± 0.42 | 6.61 ± 0.18 | 8.02 ± 0.06 | 4.51 ± 0.04 | 1.88 ± 0.14 | - | |
Kxγ'/γ | 0.94 ± 0.00 | 0.93 ± 0.03 | 1.59 ± 0.02 | 1.61 ± 0.03 | 1.96 ± 0.20 | - | |
B | Cxγ | 83.66 ± 0.22 | 7.18 ± 0.08 | 4.41 ± 0.14 | 2.85 ± 0.05 | 0.99 ± 0.14 | 0.91 ± 0.01 |
Cxγ' | 78.87 ± 0.40 | 6.67 ± 0.13 | 6.88 ± 0.05 | 4.48 ± 0.08 | 2.16 ± 0.35 | 0.94 ± 0.02 | |
Kxγ'/γ | 0.94 ± 0.00 | 0.93 ± 0.02 | 1.56 ± 0.04 | 1.57 ± 0.03 | 2.21 ± 0.43 | 1.03 ± 0.02 |
Alloy | Temperature (°C) | Time (h) | ||||
---|---|---|---|---|---|---|
8 | 50 | 300 | 600 | 1000 | ||
A | 900 | 0.11 ± 0.02 | 0.17 ± 0.04 | 0.20 ± 0.05 | 0.22 ± 0.06 | |
1000 | 0.13 ± 0.03 | 0.31 ± 0.08 | 0.40 ± 0.10 | 0.49 ± 0.14 | ||
1050 | 0.12 ± 0.03 | 0.20 ± 0.05 | 0.38 ± 0.10 | 0.53 ± 0.14 | ||
1100 | 0.17 ± 0.04 | 0.23 ± 0.06 | 0.65 ± 0.20 | |||
B | 900 | 0.11 ± 0.03 | 0.15 ± 0.04 | 0.19 ± 0.05 | 0.21 ± 0.05 | |
1000 | 0.13 ± 0.03 | 0.27 ± 0.06 | 0.37 ± 0.08 | 0.44 ± 0.11 | ||
1050 | 0.10 ± 0.02 | 0.17 ± 0.04 | 0.43 ± 0.14 | 0.56 ± 0.17 | ||
1100 | 0.15 ± 0.03 | 0.20 ± 0.04 | 0.68 ± 0.16 |
Table 5 Size of γ' precipitates in two experimental alloys after aging in the temperature range of 900 °C and 1100 °C for various time (μm).
Alloy | Temperature (°C) | Time (h) | ||||
---|---|---|---|---|---|---|
8 | 50 | 300 | 600 | 1000 | ||
A | 900 | 0.11 ± 0.02 | 0.17 ± 0.04 | 0.20 ± 0.05 | 0.22 ± 0.06 | |
1000 | 0.13 ± 0.03 | 0.31 ± 0.08 | 0.40 ± 0.10 | 0.49 ± 0.14 | ||
1050 | 0.12 ± 0.03 | 0.20 ± 0.05 | 0.38 ± 0.10 | 0.53 ± 0.14 | ||
1100 | 0.17 ± 0.04 | 0.23 ± 0.06 | 0.65 ± 0.20 | |||
B | 900 | 0.11 ± 0.03 | 0.15 ± 0.04 | 0.19 ± 0.05 | 0.21 ± 0.05 | |
1000 | 0.13 ± 0.03 | 0.27 ± 0.06 | 0.37 ± 0.08 | 0.44 ± 0.11 | ||
1050 | 0.10 ± 0.02 | 0.17 ± 0.04 | 0.43 ± 0.14 | 0.56 ± 0.17 | ||
1100 | 0.15 ± 0.03 | 0.20 ± 0.04 | 0.68 ± 0.16 |
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