Ni-Co-Mn-In based alloys with magnetically driven shape memory effect have shown its huge potential for applying as the intelligent driver in the spacecrafts. However, the numerous cosmic radiations, especially the electron irradiation with large penetration depth, could seriously harm its' serving stability. Herein, the Ni₄₅Co₅Mn₃₇In₁₃ alloys are exposed to the high energy electron irradiation with different fluence to study the phase transition behavior and microstructure evolution in the irradiation process. As a result, we reveal that the electron irradiation could induce dense crystal defects which not only reduce the transition temperature and thus retain the residual austenite in the martensitic matrix, but also destroy the continuity of martensitic laths and the atom arrangement in the twin boundaries. This work has important theoretical significance for understanding the electron irradiation's effect on the martensitic transformation and microstructure of Ni-Co-Mn-In alloys, and is conducive to expand martensitic transformation theory.

具有磁驱动形状记忆效应的Ni-Co-Mn-In基合金已显示出其作为航天器智能驱动器的巨大潜力。然而，众多的宇宙辐射，尤其是穿透深度较大的电子辐射，会严重损害其服役稳定性。这里，Ni ₄₅ Co ₅ Mn ₃₇ In ₁₃将合金暴露于不同能量密度的高能电子辐照下，研究辐照过程中的相变行为和微观结构演变。结果表明，电子辐照会引起致密的晶体缺陷，不仅会降低转变温度，从而将残余奥氏体保留在马氏体基体中，还会破坏马氏体板条的连续性和孪晶界中的原子排列。该工作对于理解电子辐照对Ni-Co-Mn-In合金马氏体相变及显微组织的影响具有重要的理论意义，有利于拓展马氏体相变理论。