Abstract
Internal friction and elastic modulus of Fe–30.30 Mn–6.10 Si, Fe–29.05 Mn–6.27 Si–0.024 RE (rare earth elements) and Fe–26.40 Mn–6.02 Si–5.20 Cr shape memory alloys were measured as a function of temperature from 150 to 600 K using an electrostatic audio-frequency internal friction instrument. The Neel temperature, T N, and M s temperature of these alloys were determined. By calculating the area covering the internal friction peak of the ε→γ reversion transformation, effects of the Neel temperature, T N, on the γ→ε martensitic transformation were investigated. The results show that alloy compositions evidently affect the T N temperature, and RE and Cr reduce the T N temperature. With the decrease of the T N temperature and the increase of M s– T N, the repressive effect of the T N temperature on the γ→ε martensitic transformation decreases, and the amount of the martensitic ε phase and the area of the internal friction peak of the ε→γ transformation increase.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have