期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.07.106
关键词
Cobalt-base superalloy; Transmission electron microscopy; Compression test; Dislocation; Stacking fault
类别
资金
- National Key Research and Development Plan [2017YFB0305201]
- National Natural Science Foundation of China [51771097]
- Science Challenge Project [TZ2018004]
- National Basic Research Programs of China [2015CB654802]
- National Magnetic Confinement Fusion Energy Research Project of China [2015GB118001]
The thermal stability and high-temperature strength of single crystal CoNi-base superalloys, Co-30Ni-10Al-7W (at%) and Co-30Ni-10Al-7W-2Ta-3Ti (at%), containing gamma'(L1(2)) phase have been investigated. The investigated CoNi-base superalloy with alloying additions of Ti and Ta exhibits excellent gamma' solves temperature, 1236 degrees C, and high-temperature strength, 622 MPa at 900 degrees C, compared to reported gamma'-strengthening Co-base superalloys. Detailed analyses of the deformation mechanisms for the investigated alloys were carried out by using the transmission electron microscopy (TEM) characterization. Two different transitions of deformation mechanisms for the gamma' phase, from superpartial dislocation shearing to dislocation bypassing and to stacking fault shear, occurred in the investigated alloys as the deformation temperature increased above the peak temperatures. Meanwhile, the high-temperature strength of the investigated alloys largely decreased as the transitions of deformation mechanism took place. The influence of alloying effects on energies of faults and the relationship between high-temperature strength and deformation mechanisms were discussed.
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