Abstract
The fcc → fct martensitic transformation of a Mn-rich γ-MnFe alloy with a (011) martensite twin was investigated using transmission electron microscopy, dynamic mechanical analysis, electrical resistance measurements, differential scanning calorimetry and dilatometry. Experimental results show that the start temperature (M s) of the martensitic transformation and the temperature (T N) of the antiferromagnetic transition in Mn85.5Fe9.5Cu5 alloys are close and almost coincide. Direct and reverse martensitic transformations, normally a first-order transformation, exhibit features similar to those of a second-order continuous transition, which is attributed to coupling between the first-order martensitic transformation and the second-order antiferromagnetic transition.
Acknowledgement
The present work is supported by the National Natural Foundation of China (Grant No. 50571065).