Superplastic‐Like Behavior and Enhanced Strength of a Two‐Phase Titanium Alloy with Ultrafine Grains

Abstract

Here, the two‐phase titanium alloy Ti‐5.7Al‐3.8Mo‐1.2Zr‐1.3Sn (Russian name VT8M‐1) with an ultrafine‐grained (UFG) structure is successfully produced by equal‐channel angular pressing (ECAP). This UFG alloy demonstrates a significant increase in strength at room temperature (RT) and superplastic‐like behavior during compression at elevated temperatures in a range of 650–800 °C. This unusual behavior is used in this work to study the forging of the alloy at 700 °C, which simulates the process of making an aircraft engine blade. It is shown that after this forging the alloy has significantly higher strength properties than after standard processing. The origin of such superior behavior of this UFG alloy is discussed.