Mn₂NiGa_1-xCr_x (x = 0–0.5) alloys were synthesized successfully to explore possible Cr-based all-d-metal Heusler alloys with magnetic shape memory effects. When x = 0–0.25, Mn₂NiGa_1-xCr_x are single BCC Heusler phase, but when x = 0.375 some FCC phase co-exists with the main Heusler phase, finally a pure FCC phase is formed in Mn₂NiGa_0.5Cr_0.5. In BCC Mn₂NiGa_1-xCr_x, Cr-doping leads to the decrease of martensitic transformation temperature T_M and increase of the saturation magnetization M_s at 5 K. While the FCC phase does not show the trace of phase transition and has a very low magnetization till 5 K. First-principles calculations suggest that, in BCC Mn₂NiGa_1-xCr_x the partial spin moment of Cr is large and parallel to that of Mn (B), which leads to the increase of M_s when x = 0–0.25. A higher stability of the martensite than the austenite is found, which supports the phase transition observed experimentally. It may be noticed that the T_M of Mn₂NiGa_1-xCr_x decreases with both increasing e/a and decreasing cell volume, which is opposite to the empirical rule in traditional Heusler alloys. Calculation suggests that Cr–Ga disorder may be a possible reason for this decrease.

的Mn ₂ NiGa _1-x的Cr _X（X = 0-0.5）合金成功地合成探索可能Cr系清一色d -金属哈斯勒合金磁性形状记忆效应。当 x = 0-0.25 时，Mn ₂ NiGa _1-x Cr _x是单一的 BCC Heusler 相，但当 x = 0.375 时，一些 FCC 相与主 Heusler 相共存，最终在 Mn ₂ NiGa _{0.5 中}形成纯 FCC 相铬_0.5。在BCC Mn ₂ NiGa _1-x Cr _{x 中}，Cr掺杂导致马氏体转变温度T _M降低并且在 5 K 时饱和磁化强度 M _s增加。而 FCC 相没有显示相变痕迹，并且在 5 K 之前具有非常低的磁化强度。第一性原理计算表明，在 BCC Mn ₂ NiGa _1-x Cr _x Cr 的部分自旋矩较大并且与 Mn (B) 的部分自旋矩平行，这导致当 x = 0-0.25 时M _s增加。发现马氏体的稳定性高于奥氏体，这支持了实验观察到的相变。可以注意到，Mn ₂ NiGa _1-x Cr _x的 T _M随 e/a 的增加和电池体积的减小而减小，这与传统 Heusler 合金的经验法则相反。计算表明，Cr-Ga 无序可能是这种减少的一个可能原因。