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Microstructure Characteristics of Transient Liquid Phase Diffusion Bonding Super-Ni/NiCr Laminated Composite to TC4 Alloy

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Transient liquid phase (TLP) diffusion bonding super-Ni/NiCr laminated composite to TC4 alloy was carried out using the interlayer of Cu foil and Ti powder at 950 °C with the pressure of 5 MPa, microstructure, shear strength and element distribution of joints were studied. Results showed that joint was mainly divided into 2 diffusion layers and 1 middle reaction layer, the width of each layer was increased with the bonding time prolonging. The main elements of joint nearby Ni80Cr20 base layer side were Ti and Cu, the existence of high-hardness intermetallic compounds in diffusion transition zone can easily lead to micro-cracks. The fracture of joint nearby super-Ni cover layer side occurred at the interface of cover layer and TC4 alloy, and the fracture of joint nearby Ni80Cr20 base layer side occurred along the interface of transient liquid phase diffusion bonding. The maximum shear strength of joint nearby super-Ni side and Ni80Cr20 side was 62 MPa and 42 MPa obtained at 950 °C when the bonding time is 90 min. The configuration of Ni80Cr20/Cu+ Ti/TC4 was brittle fracture with characteristics of plastic fracture.
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Keywords: MICROSTRUCTURE; SHEAR STRENGTH; SUPER-Ni/NiCr LAMINATED COMPOSITE; TC4 ALLOY; TLP DIFFUSION BONDING

Document Type: Research Article

Publication date: September 1, 2019

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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