Abstract
Internal friction (IF) in severely deformed Fe-26Al and Fe-26Al-5Cr (at. %) alloys based on the Fe3Al intermetallic compound has been studied in a temperature range from −180 to 650°C. A group of low-temperature IF maxima have been detected in the temperature range from −130 to 100°C at a frequency of 1.4–2.2 kHz. A comparative analysis of the revealed peaks has been carried out for Fe3Al both with and without chromium. The thermal stability of some IF maxima which form a group of low-temperature peaks in the severely deformed state has been studied. The activation energies for the maxima detected have been evaluated. An assumption has been made about the dislocation-related mechanism of the peak origin, some of which appear to be of the Hasiguti type. Within the framework of this assumption, the height and stability of some IF maxima in the Fe-26Al-5Cr alloy, as compared to those in the Fe-26Al alloy, can be explained by increasing mobility of dislocations (dislocation segments) due to alloying with chromium.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
