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Internal friction and elastic modulus of Fe-Mn-Si, Fe-Mn-Si-RE and Fe-Mn-Si-Cr shape memory alloys were measured from 150 K to 600 K by using an electrostatic audio-frequency internal friction instrument. The mtei-nal friction characteristies of the antiferromagnetic transition and γ-ε martensitic transformation as well as the interaction between these two transitions have been investigated. The results show that the γ→ε martensitic transformation is partly restrained, but can still continue below the Neel temperature ( TNγ) . When the temperature TN is slightly below the MS temperature, the internal friction peak associated with the paramagnetic → antiferromagnetic transition disappears upon cooling due to the occurrence of the γ→ε martensitic transformation, and only the internal friction peak associated with the γ→ε martensitic transformation can be observed. When the Neel temperature ( TNγ) is much below the temperature MS, the internal friction peaks appear near TNγ and MS respective
Internal friction and elastic modulus of Fe-Mn-Si, Fe-Mn-Si-RE and Fe-Mn-Si-Cr shape memory alloys were measured from 150 K to 600 K by using an electrostatic audio-frequency internal friction instrument. The results show that the γ → ε martensitic transformation is partly restrained, but can still continue below the Neel temperature (TNγ). When the temperature TN is slightly below the MS temperature, the internal friction peak associated with the paramagnetic → antiferromagnetic transition disappears upon cooling due to the occurrence of the γ → ε martensitic transformation, and only the internal friction peak associated with the γ → ε martensitic transformation can be observed. When the Neel temperature (TNγ) is much below the temperature MS, the internal friction peaks appear near TNγ and MS respective