Microscopic Characterization of Semi-Solid Ti14 Alloy

The microstructural evolution and the element distribution of Ti14(α+Ti2Cu) alloy during semi-solid compres-sion were investigated.Moreover,the Ti2Cu precipitate behaviors were discussed in detail.The results show that the micro-structure,the number and distribution of Ti2Cu precipitates have significant dependence on the process parameters.More Ti2Cu will precipitate on grain boundaries at a higher deformation temperature,and/or a lower strain rate as well as defor-mation ratio,and finally a network structure is formed after deformation at 1100 °C.The precipitation on grain boundaries is found to be mainly controlled by peritectic reactions.The elevated temperatures resulted in more liquid along the prior grain boundaries,and a Cu-rich region is formed,finally.the "coarse" grain boundaries appear during re-solidification.