J. Mater. Sci. Technol. ›› 2020, Vol. 45: 59-69.DOI: 10.1016/j.jmst.2019.10.041
• Research Article • Previous Articles Next Articles
Peng Li, Shuai Wang, Yueqing Xia, Xiaohu Hao, Honggang Dong*()
Received:
2019-08-27
Revised:
2019-10-16
Accepted:
2019-10-29
Published:
2020-05-15
Online:
2020-05-27
Contact:
Honggang Dong
Peng Li, Shuai Wang, Yueqing Xia, Xiaohu Hao, Honggang Dong. Diffusion bonding of AlCoCrFeNi2.1 eutectic high entropy alloy to TiAl alloy[J]. J. Mater. Sci. Technol., 2020, 45: 59-69.
Materials | Al | Co | Cr | Fe | Ni | Ti | Nb |
---|---|---|---|---|---|---|---|
AlCoCrFeNi2.1 EHEA | 16.39 | 16.39 | 16.39 | 16.39 | 34.43 | - | - |
TiAl alloy | 42.0 | - | - | - | - | 50.9 | 7.1 |
Table 1 Chemical composition (at. %) of AlCoCrFeNi2.1 EHEA and TiAl alloy.
Materials | Al | Co | Cr | Fe | Ni | Ti | Nb |
---|---|---|---|---|---|---|---|
AlCoCrFeNi2.1 EHEA | 16.39 | 16.39 | 16.39 | 16.39 | 34.43 | - | - |
TiAl alloy | 42.0 | - | - | - | - | 50.9 | 7.1 |
Fig. 1. Characteristics of base metals: microstructure (a) and XRD patterns (b) of AlCoCrFeNi2.1 EHEA; microstructure (c) and XRD patterns (d) of TiAl alloy.
Fig. 7. Growth of diffusion layers in Zone A and Zone B at different temperatures: (a) Zone A at 900 °C; (a1) Zone A at 950 °C; (a2) Zone A at 1000 °C; (b) Zone B at 900 °C; (b1) Zone B at 950 °C; (b2) Zone B at 1000 °C.
Locations | Al | Co | Cr | Fe | Ni | Ti | Nb | Possible phases |
---|---|---|---|---|---|---|---|---|
A | 8.9 | 14.2 | 34.0 | 21.5 | 18.2 | 2.8 | 0.4 | FCC |
B | 22.6 | 12.7 | 16.9 | 14.2 | 29.7 | 3.7 | 0.3 | B2 |
C | 22.9 | 14.8 | 1.7 | 7.8 | 26.8 | 24.1 | 1.8 | Al(Co, Ni)2Ti |
D | 36.3 | 3.6 | 2.0 | 6.8 | 14 .4 | 31.6 | 5.3 | τ3-Al3NiTi2 |
E | 33.2 | 7.1 | 0.6 | 8.1 | 9.0 | 39.5 | 2.4 | TiAl |
F | 34.6 | 1.3 | 0.6 | 2.3 | 5.2 | 50.3 | 5.6 | TiAl + Ti3Al |
Table 2 Chemical composition (at. %) analysis at the locations marked in Fig. 7.
Locations | Al | Co | Cr | Fe | Ni | Ti | Nb | Possible phases |
---|---|---|---|---|---|---|---|---|
A | 8.9 | 14.2 | 34.0 | 21.5 | 18.2 | 2.8 | 0.4 | FCC |
B | 22.6 | 12.7 | 16.9 | 14.2 | 29.7 | 3.7 | 0.3 | B2 |
C | 22.9 | 14.8 | 1.7 | 7.8 | 26.8 | 24.1 | 1.8 | Al(Co, Ni)2Ti |
D | 36.3 | 3.6 | 2.0 | 6.8 | 14 .4 | 31.6 | 5.3 | τ3-Al3NiTi2 |
E | 33.2 | 7.1 | 0.6 | 8.1 | 9.0 | 39.5 | 2.4 | TiAl |
F | 34.6 | 1.3 | 0.6 | 2.3 | 5.2 | 50.3 | 5.6 | TiAl + Ti3Al |
Fig. 11. TEM images of diffusion zone at 950 °C: (a) the bright field image (BFI), (b) the dark field image (DFI) and (c) the SAED patterns of marked positions.
Fig. 12. Fitted growth curve and growth activation energy of different layers in Zone A and Zone B: (a) growth curve in Zone A; (b) growth curve in Zone B;(c) growth activation energy in Zone A; (d) growth activation energy in Zone B.
Fig. 14. Fracture path of joints bonded at different temperatures of 900 °C (a), 950 °C (b), 1000 °C (c) and fracture morphologyon TiAl alloy side of resultant joints at 950 °C (d-f).
Locations | Al | Co | Cr | Fe | Ni | Ti | Nb | Possible phases |
---|---|---|---|---|---|---|---|---|
G | 38.8 | 3.3 | 1.2 | 4.9 | 14.0 | 31.6 | 6.2 | τ3-Al3NiTi2 |
H | 42.3 | 0.3 | - | 0.4 | 0.1 | 49.9 | 7 | TiAl |
I | 8.1 | 13.4 | 39.7 | 23.8 | 9.2 | 5.1 | 0.8 | FCC |
Table 3 Chemical composition (at. %) of marked locations on fracture surface of TiAl alloy side.
Locations | Al | Co | Cr | Fe | Ni | Ti | Nb | Possible phases |
---|---|---|---|---|---|---|---|---|
G | 38.8 | 3.3 | 1.2 | 4.9 | 14.0 | 31.6 | 6.2 | τ3-Al3NiTi2 |
H | 42.3 | 0.3 | - | 0.4 | 0.1 | 49.9 | 7 | TiAl |
I | 8.1 | 13.4 | 39.7 | 23.8 | 9.2 | 5.1 | 0.8 | FCC |
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