Microstructural Evolution of a Ni-base Alloy DZ468 Joint Bonded with a New Co-base Filler

doi:10.1016/j.jmst.2013.12.010

J. Mater. Sci. Technol.

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Microstructural Evolution of a Ni-base Alloy DZ468 Joint Bonded with a New Co-base Filler

Yanhong Jing, Zhi Zheng, Enze Liu, Yi Guo

Division of Superalloy, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2012-11-20 Revised:2012-11-20 Online:2014-05-15 Published:2014-05-15
Contact: E. Liu
Supported by:
This work was finally supported by the National Base Research Program of China.

Abstract

Abstract:

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 of γ, M₂B, M₅B₃ and M₂₃B₆ phases. Because of the interdiffusion between the base metal and the filler, γ, 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. Microstructural Evolution of a Ni-base Alloy DZ468 Joint Bonded with a New Co-base Filler[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.12.010.

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Microstructural Evolution of a Ni-base Alloy DZ468 Joint Bonded with a New Co-base Filler

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