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A novel cobalt base superalloy containing titanium and aluminum was investigated through metallography,tensile test,and high-temperature isothermal compression deformation.The results show that proper content of titanium and aluminum with can improve the strength and duc- tility of the cobalt base superalloy.The Co_3(Ti,Al)compound with L12 structure precipitates when the novel superalloy is aged at 800℃for 20 h.Theεphase with hcp structure also precipitates when the superalloy is deformed by 28% and then aged at 650℃for 4 h.Theεphase can exist at 800℃.The superalloy has excellent high-temperature mechanical properties.Its maximum flow stress at 850℃is in the range of 360-475 MPa when the strain rate is between 0.0021 and 2.1 s~(-1).The flow stress of the superalloy during high-temperature deformation can be described by the Zener-Hollomon parameter with a hot deformation activation energy of 397 kJ·mol~(-1).
A novel cobalt base superalloy containing titanium and aluminum was investigated through metallography, tensile test, and high-temperature isothermal compression deformation. The results show that proper content of titanium and aluminum with can improve the strength and duc- tility of the cobalt base superalloy. The Co_3 (Ti, Al) compound with L12 structure precipitates when the novel superalloy is aged at 800 ° C for 20 h.Theεphase with hcp structure also precipitates when the superalloy is deformed by 28% and then aged at 650 ° C for 4 h.Theεphase can exist at 800 ° C. The superalloy has excellent high-temperature mechanical properties. The maximum flow stress at 850 ° C. is in the range of 360-475 MPa when the strain rate is between 0.0021 and 2.1 s -1. stress of the superalloy during high-temperature deformation can be described by the Zener-Hollomon parameter with a hot deformation activation energy of 397 kJ · mol -1.