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

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 degrees C. This unusual behavior is used in this work to study the forging of the alloy at 700 degrees 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.

Automated summary

A two-phase titanium alloy with an ultrafine-grained structure was successfully produced using equal-channel angular pressing. This alloy showed significant strength increase at room temperature and exhibited superplastic-like behavior during compression at high temperatures. The study utilized this behavior to investigate the forging process of the alloy and found that the forged alloy had significantly higher strength properties compared to standard processing. The origin of this superior behavior in the ultrafine-grained alloy was discussed.