Relationship between grain size and martensitic transformation start temperature in a Ti–30Ni–20Cu alloy ribbon

The relationship between the parent phase grain size and the B2–B19 martensitic transformation start temperature (Ms) was investigated in a Ti–30Ni–20Cu alloy ribbon fabricated by melt spinning. The average grain size of the ribbons increased from 0.7 to 1.2 μm with increasing crystallization temperature from 748 to 823 K without significant compositional change and precipitation. Ms increased from 308 to 317 K with increasing crystallization temperature from 748 to 823 K, which was ascribed to the increase in grain size.