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THEORETICAL CALCULATION OF THE THERMO-HYSTERESIS OF PHASE TRANSFORMATION IN Fe-Mn-Si ALLOYS

A normal formula, to calculate the thermo-hysteresis of phase transformation in Fe-Mn-Si shape memory alloys, is obtained by using thermodynamics and the concept of interface-friction. The calculated results of thermo-hysteresis are consistent to the values from experiments. The big thermo-hysteresis (A s - M s ) of transition comes from the much interface-friction which is direct-proportional to (As - M s ).