Metastability of ferromagnetic Ni–Mn–Sn Heusler alloys

Properties and Decomposition of Heusler Alloys

“…Note that the segregation is easily initiated if the alloys are prepared as such that they have just transformed martensitically. Earlier experiments, in particular for Ni–Mn–Sn alloys, seem to support this observation of segregation of Heusler alloys with compositions that are close to the martensitic phase transformation …”

Martensitic transformation and phase stability of In-doped Ni-Mn-Sn shape memory alloys from first-principles calculations

“…In recent years, it has been found that Ni-Mn-X (X ¼ Sn, In, Sb) alloys have a martensitic phase transition (MPT) from a high-symmetry austenitic phase to a low-symmetry martensitic phase, and that this transition is often accompanied by a sharp change in magnetization and resistivity. [13][14][15][16][17] Previous investigations have shown that the MPT temperature, T M , is sensitive to chemical composition, [17][18][19][20][21][22][23] and it could therefore be fine-tuned by varying the alloying elements. It is important to understand the effect of the composition dependence of T M for future material design and practical applications.…”

Ferromagnetic Shape Memory Heusler Materials: Synthesis, Microstructure Characterization and Magnetostructural Properties

“…Low-temperature annealing of homogenized samples (1223 K for 4 weeks) of Ni 50 Mn 50−x Sn x ( x = 10–25) alloys at 773 K caused decomposition to compositions near x = 1 and x = 20. While one composition would likely exhibit transformation above 700 K, the other exhibited none [74,176]. It was confirmed that the L2 1 phase is metastable at 773 K over an intermediate composition range and that transformations below 400 K account for the ferromagnetic shape memory behavior.…”