Microstructural Evolution of a Ni-base Alloy DZ468 Joint Bonded with a New Co-base Filler
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第5期
论文作者：Yanhong Jing Zhi Zheng Enze Liu Yi Guo
文章页码：480 - 486
摘 要：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,M2B,M5B3 and M23B6 phases.Because of the interdiffusion between the base metal and the filler,y,MC,M5B3 and M23B6 phases are formed in the bonding zone.And localized liquidation of substrate occurs in the diffusion affected zone,with MC and M3B2 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.
Yanhong Jing，Zhi Zheng，Enze Liu，Yi Guo
Division of Superalloy,Institute of Metal Research,Chinese Academy of Sciences
摘 要：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,M2B,M5B3 and M23B6 phases.Because of the interdiffusion between the base metal and the filler,y,MC,M5B3 and M23B6 phases are formed in the bonding zone.And localized liquidation of substrate occurs in the diffusion affected zone,with MC and M3B2 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.
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