本发明公开了一种具有高磁能积的MnBiAl 永磁合金及其制备方法，MnBiAl永磁合金的组成 为Mn55Bi45‑x Alx，其中0＜x≤4。制备方法为：采用 真空感应熔炼技术制备了合金锭，随后在290℃ 下退火12小时。本发明通过掺杂适量的Al元素， 使其占据在MnBi晶体Bi原子处以及空位处，优化 其晶格参数，调控其Mn‑Mn之间铁磁性耦合，提高 磁晶各向异性，最终调节其永磁性能，测试后发 现合金材料的最大磁能积得到了大大提升；制备过程简便易行，极具应用前景。 

The present invention discloses a MnBiAl permanent magnet alloy with high magnetic energy product and a method for its preparation, the MnBiAl permanent magnet alloy consisting of a MnBiAl permanent magnet alloy and a method for its preparation, the MnBiAl permanent magnet alloy comprising Mn55Bi45-xAlx, wherein 0 < x ≤ 4. The method of preparation is as follows: using a vacuum induction melting technique to prepare the alloy ingot, followed by annealing at 290°C annealed at 290°C for 12 hours. In the present invention, by doping an appropriate amount of Al element, the atoms and vacancies in the MnBi crystals, optimizing the lattice parameters and regulating the lattice parameters, regulating the ferromagnetic coupling between Mn-Mn, and improving the magnetic crystal anisotropy. magnetic anisotropy, and ultimately regulate the permanent magnetic properties of the alloy. The maximum magnetic energy product of the alloy is greatly improved; the preparation process is simple and feasible, which is very important.The preparation process is simple and easy, which is very promising for application.