Heusler shape memory alloys are important for many applications due to their typical magnetic and shape memory behaviors. In this study, a Ni₅₀Mn₃₆Sn₁₂Co₂ (at.%) alloy was manufactured by arc-melting technique, then the ingot cooled to ambient temperature in the natural atmosphere. Three different temperatures, including 500 °C (773 K), 700 °C (973 K), and 900 °C (1173 K), was selected for aging the samples cut from the main ingot. The impact of aging on the crystalline; microstructure; caloric; and magnetic properties of the alloys were investigated through x-ray diffraction (XRD); scanning electron microscope; differential scanning calorimetric (DSC), differential thermal analysis, and thermal gravimetric (TG); and physical property measuring system was investigated, respectively. The aging in different temperatures led to the shift DSC curve, such that the martensitic phase transformation temperatures of the sample aged at 773 K increased, however, the transformation at 973 and 1173 K decreased compared to the as-casted alloy. The different phase transformation behavior showed that the alloy aged at 773 K has the maximum elastic energy, enthalpy and entropy change compared to the reset of samples, on the other hand, its crystallite sized obtained from XRD analysis comparably diminished. Besides, the TG analysis revealed that the mass gain almost occurs at a temperature above 773 K, therefore the magnetization of the alloys aged at 973 and 1173 K decreased due to a thin oxide layer formed on the surface of the alloys.

由于其典型的磁性和形状记忆行为，Heusler 形状记忆合金对许多应用都很重要。在本研究中，Ni ₅₀ Mn ₃₆ Sn ₁₂ Co ₂(at.%)合金采用电弧熔炼技术制造，然后在自然气氛中将铸锭冷却至环境温度。选择三种不同的温度，包括 500 °C (773 K)、700 °C (973 K) 和 900 °C (1173 K) 对从主锭上切割的样品进行时效。老化对结晶的影响；微观结构；热量; 并通过X射线衍射（XRD）研究了合金的磁性能；扫描电子显微镜；差示扫描量热 (DSC)、差热分析和热重 (TG)；和物性测量系统分别进行了研究。不同温度下的时效导致 DSC 曲线发生偏移，使得样品在 773 K 时效时的马氏体相变温度升高，然而，与铸态合金相比，在 973 和 1173 K 处的转变减少。不同的相变行为表明，与重置样品相比，773 K 时效的合金具有最大的弹性能、焓和熵变化，另一方面，其从 XRD 分析获得的微晶尺寸相对减小。此外，TG 分析表明，质量增加几乎发生在 773 K 以上的温度，因此在 973 和 1173 K 时效合金的磁化强度降低，因为合金表面形成了薄氧化层。从 XRD 分析获得的微晶尺寸相对减少。此外，TG 分析表明，质量增加几乎发生在 773 K 以上的温度，因此在 973 和 1173 K 时效合金的磁化强度降低，因为合金表面形成了薄氧化层。从 XRD 分析获得的微晶尺寸相对减少。此外，TG 分析表明，质量增加几乎发生在 773 K 以上的温度，因此在 973 和 1173 K 时效合金的磁化强度降低，因为合金表面形成了薄氧化层。