Polycrystalline Ni₅₀Mn₂₉Ga₂₁ thin ribbons were prepared by melt-spinning and the effect of annealing temperatures on the microstructural evolution, phase transformations, crystal structure, and the magnetic properties of the ribbons was systematically investigated. Different annealing temperatures from 473 to 1100 K were used to alter the degree of quenched-in disorder gradually, which led to evolution of microstructure from cellular to well-defined grain structure. The crystal structure was found to be 7 M monoclinic in ribbons annealed at 773 K or below, while a minority phase with 5 M tetragonal structure is found to co-exist on annealing at 1100 K. The as-spun ribbon exhibit superparamagnetic behavior whereas the sample annealed at 1100 K did not exhibit the same. The variations in the saturation magnetization with annealing temperatures were systematically correlated. The saturation magnetization and the martensitic transformation temperature show a correlation to the increase in the degree of Mn ordering.

多晶Ni ₅₀ Mn ₂₉ Ga ₂₁通过熔融纺丝制备薄带，并系统地研究了退火温度对带的微观结构演变，相变，晶体结构和磁性的影响。使用了从473到1100 K的不同退火温度来逐渐改变淬火无序程度，从而导致微观结构从蜂窝状演变为轮廓分明的晶粒结构。发现在773 K或更低的温度下退火的带中的晶体结构为7 M单斜晶，而在1100 K的退火中发现具有5 M方形结构的少数相共存。初生带表现出超顺磁行为，而1100 K退火的样品没有表现出相同的结果。系统地关联了饱和磁化强度与退火温度的变化。