High temperature compression property of (Nb,Fe) co-alloying TiAl-based alloys with initial stress 300 MPa at 400 °C-700 °C

The compressive properties of Ti-44Al-4Nb-0.5Fe-0.1B and Ti-44Al-6Nb-2Fe-0.1B alloys at 400 °C-700 °C and initial stress of 300 MPa were studied. The results show that under the condition of 400 °C/300 MPa, due to the solid solution strengthening of Nb and Fe atoms and the hindering effect of work hardening on dislocation motion, the stress of both alloys increased. At 500 °C-700 °C and initial stress of 300 MPa, part of the stress is offset due to the stress-strain coordination of B2 and the grain boundary slip and rotation of the grains. At high temperature, there are obvious cracks in the alloy, which reduces the stress of the alloy. At 400 °C/300 MPa, Ti-44Al-6Nb-2Fe-0.1B alloy has excellent compressive properties.