| Summary: | The crystallization kinetics and structure evolution during annealing of the Ni<sub>45.5</sub>Co<sub>4.5</sub>Mn<sub>36.6</sub>In<sub>13.4</sub> (at. %) powders produced by mechanical alloying (MA) was investigated. After 70 h and 100 h of MA, the powder consisted of a mixture of amorphous and nanocrystalline body-centered cubic (bcc) phases. We observed the relaxation in the as-received powder. The relaxation temperature (T<sub>re</sub>) increases logarithmically with the annealing time. Annealing above 440 °C results in (1) ordering of L2<sub>1</sub>, (2) dissolution of the residual Ni and Mn, (3) tetragonal MnNi phase formation and (4) γ phases precipitation. The activation energies of the B2 → L2<sub>1</sub> and Mn (α-Mn) → MnNi (P4/mmm) transformations were calculated.
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