Microstructure evolution and bonding mechanism of Ti2SnC-Ti6Al4V joint by using Cu pure foil interlayer

Abstract

Ti 2 SnC, as one of functional ceramics with self-healing ability, was studied in welding with Ti6Al4V (TC4) through Cu interlayer under an applied mechanical pressure 10MPa in Ar atmosphere. Electron probe microanalyses indicated that the outward diffusion of Sn from Ti 2 SnC played a critical role in the chemical composition of the joining interface. After 60 min, the reaction layers consisted of five zones: an interleaved zone (V) of β-Cu(Sn) and α-Cu(Sn), an enriched zone (IV) of Sn and intermetallic CuTi 0.5 Sn 0.5 phase, the intermetallic zones (III) and (II) composed of TiCu 4 and Ti 3 Cu 4 , a zone (I) consisting of β-Ti (Cu) phase. After shear tests, the corresponding fractographs indicated that the cracks mainly propagated in the Ti 2 SnC matrix with an intergranular fracture mode.

AgCuTi/graphene-reinforced Cu foam: A novel filler to braze ZrB2-SiC ceramic to Inconel 600 alloy

“…To overcome this drawback, the self-joining of ceramics or connection to metals has been proposed. Up to date, joining ceramics and metals can be realized through brazing [3,4], diffusion bonding [5,6], and transient liquid phase bonding [7,8]. However, unwanted residual stresses at joint interfaces turn out during the cooling processes because of poor wettability of ceramics and mismatches of coefficients of thermal expansion (CTE) between ceramics and metals.…”

Recent Progress in the Joining of Titanium Alloys to Ceramics

“…Other ceramic materials can be also bonded with success by diffusion bonding. Yu et al [54] performed diffusion bonds of Ti6Al4V to Ti 2 SnC ceramic using a pure Cu interlayer. The diffusion bonding experiment was performed at 750 • C for 10 to 60 min under 10 MPa.…”

“…The successful application of these advanced ceramics depends strongly on the joining of these materials with metals. In addition, the possibility to combine properties as high wear resistance and high thermal stability with low density, high temperature properties, and excellent creep and corrosion resistance could enable the production of more advanced components that better meet the high requirements of several industrial sectors [21].The most suitable methods for bonding metals and ceramics and producing successful joints with appreciated properties are brazing , diffusion bonding [43][44][45][46][47][48][49][50][51][52][53][54][55] and transient liquid phase bonding [56,57]. All these processes present advantages and disadvantages in dissimilar joining between titanium alloys and ceramics and its selection will depend on the application.…”

Joining Ti6Al4V to Alumina by Diffusion Bonding Using Titanium Interlayers

“…This mismatch of properties induces the formation of residual stresses at the joint's interface during cooling. Researchers have worked to improve knowledge about the mechanisms that affect the joining of metals to ceramics [7][8][9][10][11][12][13][14]. The most reported technologies in the literature with regards to joining dissimilar materials are brazing and solid-state diffusion bonding [15][16][17].…”

“…Diffusion bonding can obtain sound joints between dissimilar materials, mainly when interlayers are applied to join the faying diffusion surfaces. In this case, cracks due to residual stress can be prevented [10,17,[31][32][33][34][35][36][37][38]. Active elements have been used as interlayers, e.g., titanium, niobium, and zirconium [15,16].…”