The effect of heat treatment on microstructure and martensitic transformation temperatures in Ni44Fe19Ga27Co10 single crystals

Timofeeva, E.E., Panchenko, E.Y., Tokhmetova, A.B., (...), Surikov, N.Y., Chumlyakov, Y.I.// Physica Scripta//

https://iopscience.iop.org/article/10.1088/1402-4896/ad16b2

The microstructure and temperature of martensitic transformation of Ni₄₄Fe₁₉Ga₂₇Co₁₀ single crystals after aging at temperatures from 623 K to 1173 K were studied by electron microscopy and differential scanning calorimetry. The temperature ranges of the second phase precipitation, their lattice structure and volume fraction, and also the modification of the nanodomain structure of the L2₁+B2 high-temperature phase were determined in dependence on aging temperature. The influence of microstructure parameters on the martensitic transformation temperatures, transformation intervals and thermal hysteresis has been discussed.