Abstract In this work we report the elaboration of a family of metamagnetic shape memory alloys with composition Mn49Ni42-x FexSn9 (x = 0, 2, 3, 4, 5 and 6 at.%) and the systematic study of their structure, martensitic transformation (MT) behavior and functional characteristics as a function of the Fe doping and magnetic field, up to 12 T. Regarding the influence of the magnetic field, we have tentatively divided the alloys into two groups: group I, alloys with x = 0, 2, 3 and 4 and group II, alloys with x = 5 and 6. Group II alloys exhibit an appreciable amount of dispersed γ-phase and a field-induced arrest of MT. The alloys from group I show a large magnetization drop at MT that proceeds steeply. This group also displays a monotonous evolution of all studied properties with pronounced metamagnetic effect and large magnetostrain effect, reaching 0.3%, in the alloy with x = 4.

中文翻译：

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Fe掺杂和磁场对Mn-Ni(Fe)-Sn变磁形状记忆合金马氏体转变的影响

摘要 在这项工作中，我们报告了一系列组成为 Mn49Ni42-x FexSn9 (x = 0, 2, 3, 4, 5 和 6 at.%) 的变磁形状记忆合金的制作及其结构、马氏体转变的系统研究(MT) 行为和功能特性作为 Fe 掺杂和磁场的函数，高达 12 T。关于磁场的影响，我们暂时将合金分为两组：I 组，x = 0 的合金， 2、3 和 4 以及 II 组，x = 5 和 6 的合金。II 组合金表现出相当数量的分散 γ 相和 MT 的场诱导停滞。来自 I 组​​的合金在 MT 处显示出大的磁化下降，并且急剧下降。该组还表现出所有研究性质的单调演变，具有明显的超磁效应和大磁应变效应，