The effect of the ω phase on the temperatures of martensitic transformations and thermal stability in Ni₄₄Fe₁₉Ga₂₇Co₁₀ (at.%) single crystals

M.V. Zherdeva, E.E. Timofeeva, E.Yu. Panchenko, A.I. Tagiltsev, Y.I. Chumlyakov show affiliations and emails

Received 12 March 2026; Accepted 07 May 2026;

Citation: M.V. Zherdeva, E.E. Timofeeva, E.Yu. Panchenko, A.I. Tagiltsev, Y.I. Chumlyakov. The effect of the ω phase on the temperatures of martensitic transformations and thermal stability in Ni₄₄Fe₁₉Ga₂₇Co₁₀ (at.%) single crystals. Lett. Mater., 2026, 16(3) 226-231

BibTex https://doi.org/10.48612/letters/2026-3-226-231

Abstract

The choice of heat treatment modes for Ni₄₄Fe₁₉Ga₂₇Co₁₀ single crystals enables either elevated MT temperatures or high thermal stability, depending on the formation/dissolution of the ω-phase.

This work investigates the influence of the nanoscale ω-phase on the martensitic transformation temperatures and their thermal stability in Ni₄₄Fe₁₉Ga₂₇Co₁₀ (at.%) single crystals. Understanding the role of nanoscale secondary phases is essential for the controlling the functional properties of high-temperature Heusler alloys exhibiting the martensitic transformations. The electron transmission microscopy and differential scanning calorimetry were used to analyze the microstructural evolution and corresponding changes in transformation temperatures during thermal treatments and preheating. The results have shown that the decrease in transformation start temperature, Ms, upon reaching a temperature of 573 K is associated with the precipitation of ω-phase nanoparticles. The increase in Ms at 773 K is due to the dissolution of the ω-phase. The absence of the nanoscale ω-phase particles after annealing at 773 K for 1 h led to high martensitic transformation temperature (Ms = 316 K) and their low thermal stability during a preheating up to 573 K (Ms decreased by 50 K). Annealing at 573 K for 1 h led to the precipitation of the nanoscale ω-phase particles and reduced the martensitic transformation temperature (Ms = 273 K), but significantly increased a thermal stability of martensitic transformation during preheating to 573 K (Ms decreased by only 16 K).

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Funding

1. Russian Scientific Foundation - № 24-19-00242