NDLI: Interfacial reaction and microstructure study of DSS/Cu/Ti64 diffusion-welded couple

Content Provider	Springer Nature Link
Author	Chakraborty, Asmita Mishra, Brajendra Kundu, Sukumar
Copyright Year	2017
Abstract	In the present study, the interfacial reaction and microstructure behavior of diffusion-welded joints (DWJs) between duplex stainless steel (DSS) and Ti–6Al–4V alloy (Ti64) with copper interlayer were investigated. The joints were carried out at 825, 850, 875 and 900 °C temperature for 60 min under 4 MPa uniaxial pressure in vacuum. Welded joint was characterized by light microscopy and scanning electron microscopy using backscattered electron mode. Layer-wise Cu$_{4}$Ti, Cu$_{2}$Ti, Cu$_{4}$Ti$_{3}$, CuTi and CuTi$_{2}$ intermetallic phases were formed at the Cu–Ti64 interface and the width of the intermetallic layers increases with increase in welding temperature. However, the DSS–Cu interface was completely free from intermetallics. The activation energy and interfacial energy of reaction phases was calculated at the interface. The activation energy values showed that the CuTi intermetallic grew faster than the other phases of the Cu–Ti-based reaction. However, CuTi$_{2}$ phase first nucleates than the other Cu–Ti-based intermetallics due to its lowest interfacial energy. The highest joint tensile strength of ~ 516 MPa (~ 79% of DSS) along with ~ 6.6% ductility was achieved at 875 °C processing temperature.
Starting Page	155
Ending Page	167
Page Count	13
File Format	PDF
ISSN	00432288
Journal	Welding in the World
Volume Number	62
Issue Number	1
e-ISSN	18786669
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-11-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Interfacial energy Intermetallics Metallic Materials Theoretical and Applied Mechanics Activation energy Continuum Mechanics and Mechanics of Materials Diffusion welding Tensile strength
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Mechanical Engineering

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