Yield Strength Prediction of Titanium Alloys

A confidence interval on the yield strength prediction for wrought titanium alloy Ti-6Al-4V is presented, statistically estimated from a recently developed phenomenological model relating the material parameters to material properties. In this study, the material composition and microstructure parameters were statistically characterized using multimodal, three-parameter Weibull, Normal and Uniform distributions to capture their naturally occurring variability. These estimations were used to predict mean square error and confidence intervals on the material strength of the alloy, comparing model results with experimentally obtained data. Model estimation is in good agreement with the experimental data, deviating by no more than 6%. The work presented here provides a probabilistic relationship between titanium alloy processing, resulting microstructure, and its performance.