Diffusionless phase transformation characteristics of Mn75.7Pt24.3

• Mn75.7Pt24.3 exhibits phase transformation in the temperature range of 180–200 °C.
• Both the high and low temperature phases have face-centered cubic structures.
• Alloy possesses high damping capacity during phase transformation.
• Mn75.7Pt24.3 has transformation strain of 0.5% with a volume change of 1.5%.
• Mn75.7Pt24.3 is a promising candidate for high temperature actuator applications.

Phase transformation, damping, and magnetic properties of a Mn75.7Pt24.3 (at.%) alloy were characterized. It was observed that Mn75.7Pt24.3 exhibits a stable phase transformation in the temperature range of 180–200 °C with a small temperature hysteresis and maximum transformation strain of ∼0.5%. The crystal structures and lattice parameters of the transforming phases were determined, where both the high and low temperature phases have a face-centered cubic structure but with different lattice parameters. Finally, it was revealed that the alloy possesses high damping capacity (average Tan Delta of 0.16) during phase transformation.