Realization of magnetic-field-induced martensitic transformation in melt-spun Fe-Mn-Ga alloys

•Attain BCC type structure in melt-spun Fe-Mn-Ga alloys.•Uncover the instability in the martensitic transformation of Fe-Mn-Ga alloys.•Realize the magnetic-field-induced martensitic transformation. This study investigates the crystal structural, magnetic properties, and phase transformation of melt-spun Fe-Mn-Ga alloys. We found that melt-spun Fe50Mn25Ga25 alloy crystallizes into a γ phase, which exhibits ferromagnetism at room temperature, and undergoes a magnetic transition at 257 K. On the other hand, melt-spun Fe49Mn24Ga27, Fe43Mn28Ga29 and Fe44Mn28Ga28 alloys exhibit a single body-centered cubic phase, with the latter two alloys undergo martensitic transformation during cooling. Additionally, a magnetic-field-induced martensitic transformation was observed within the temperature range of 180 to 160 K. Notably, the martensitic transformation temperatures of these two melt-spun Fe-Mn-Ga alloys are significantly lower compared to other fabrication methods, potentially attributed to the atomic disorder, microstructure and internal stresses that arise during the melt-spun fabrication process. These findings expand the available preparation methods for Fe-Mn-Ga alloys and offer new possibilities for future applications.