Numerical simulation of thermal/residual stresses in brazed Ti/TiAi joints

Finite element method was used to calculate residual stress that developed when TiAl inter metallic was bonded to Ti alloy by Ag-based filler metal during cooling from joining temperature.The stress distribution of the joint in different joining temperature was studied.The results showed that the residual stress concentration between three layers existed at the interface.Especially,the maximum value of the residual stress between TiAl and filler metal was higher than that between Ti alloy and the filler metal.Stress distribution was shown to be almost not dependent upon joining temperature.But when the joining temperature be-came lower,the maximum value of the residual stress at the sanle position decreased accordingly.