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Bonding pressure effects on characteristics of microstructure, mechanical properties, and mass diffusivity of Ti-6Al-4V and TiAlNb diffusion-bonded joints

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Abstract

This research highlights the influence of bonding pressure on the features of diffusion-bonded joints (DBJs) between Ti6Al4V alloy and TiAlNb alloy investigated at 900 °C for 120 minutes in vacuum with variable pressures of 0.5, 1, 2, 3, and 4 MPa. Characterization of the bonded interfaces was conducted using optical microscopy and scanning electron microscopy in backscattered mode. A molecular dynamics (MD) model was developed with the commercial Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) package utilizing second nearest neighbor modified embedded atom method (2NN MEAM) potentials to predict the diffusion mechanism with variable compressive pressures along the TiAlNb|Ti6Al4V joint interface. Microstructural characterization with light microscopy and scanning electron microscopy in back-scattered mode (SEM-BSE) along the TiAlNb|Ti6Al4V DBJs revealed no interfacial intermetallic phase nucleation. Energy dispersive spectroscopy (EDS) maps and line profiles helped to understand composition variation across the interface. The maximum joint tensile strength of ~ 875 MPa, ~ 13.1% elongation, and mass diffusivity on both sides were obtained at 4 MPa processing pressures with a significant tendency of diffusivity improvement in the TiAlNb side.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West Bengal, 711103, India

    J. Kundu, A. Chakraborty & S. Kundu

  2. Department of Materials Engineering, University of British Columbia, 105-6350 Stores Road, Vancouver, BC, V6T 1Z4, Canada

    A. Chakraborty

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Recommended for publication by Commission III - Resistance Welding, Solid State Welding, and Allied Joining Process

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Kundu, J., Chakraborty, A. & Kundu, S. Bonding pressure effects on characteristics of microstructure, mechanical properties, and mass diffusivity of Ti-6Al-4V and TiAlNb diffusion-bonded joints. Weld World 64, 2129–2143 (2020). https://doi.org/10.1007/s40194-020-00989-x

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