Study on Non-thermal ω Phase Transformation of Ti-1300 Alloy

Abstract:

The ω phase transformation of Ti-1300 alloy during continuous heating was investigated using dilatometric method. Results show the βM→ω+β phase transformation happenes in low temperature zone, but the βM→α+β phase transformation happenes in high temperature zone during continuous heating. The temperature region of the β→ω phase transformation in the Ti-1300 alloy increased with increasing heating rate. The curves of ω phase transformed volume fraction and temperature at different heating rates exhibited a typical ‘S’ pattern. The activation energy of non-thermal ω phase transformation increased as increasing of ω phase transforming volume fraction, which added to precipitating resistance of ω phase. The average activation energy of the non-thermal ω phase transformation of the alloy was 55 kJ/mol.