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Ni-base alloy DZ468 has been joined by transient liquid phase bonding technique with a newly developed Co-based filler.The microstructures of the Co-base filler and the joint,the effects of heat treatment on microstructure and hardness of the joint have been investigated by various experimental methods.Results show that the Co-base filler consists ofγ,M_2B,M_5B_3 and M_(23)B_6 phases.Because of the interdiffusion between the base metal and the filler,y,MC,M_5B_3 and M_(23)B_6 phases are formed in the bonding zone.And localized liquidation of substrate occurs in the diffusion affected zone,with MC and M_3B_2 precipitating in this area.During heat treatment,the volume of the intermetallic phases in the bonding zone resulting from incomplete isothermal solidification decreases obviously.On the contrary,the width of the diffusion affected zone increases at the solution stage and subsequently decreases at the aging stages.
Ni-base alloy DZ468 has been joined by transient liquid phase bonding technique with a newly developed Co-based filler. Microstructures of the Co-base filler and the joint, the effects of heat treatment on microstructure and hardness of the joint have been investigated. by various experimental methods. Results show that the Co-base filler consists of γ, M_2B, M_5B_3 and M_ (23) B_6 phases. Period of the interdiffusion between the base metal and the filler, y, MC, M_5B_3 and M_ (23) B_6 phases are formed in the bonding zone. An localized liquidation of substrate occurs in the diffusion affected zone, with MC and M_3B_2 precipitating in this area. Temperature heat treatment, the volume of the intermetallic phases in the bonding zone resulting from incomplete isothermal .On the contrary, the width of the diffusion affected zone increases at the solution stage and saves decreases at the aging stages.