In this study, we systematically studied the high pressure polymorphism phase transition process in the Fe₄₀Mn₄₀Co₁₀Cr₁₀ multi-principal element alloy through the hexahedron pressure equipment and the high pressure synchrotron angle-dispersive x-ray diffraction technique. A mixture of face-center cubic (fcc) + hexagonal close packed (hcp) nanolaminate structure was observed for the samples after high pressure treatment at 5 GPa, through the hexahedron pressure equipment. Especially, the hcp lath interaction structure with a new secondary hcp phase at the intersection zone was discovered in the sample. Transmission Electron Microscopy (TEM) analysis revealed that the transition from fcc to hcp was accomplished by the glide of Shockley partial dislocations. In addition, the in-situ synchrotron angle-dispersive x-ray diffraction technique was carried out to detect the phase transition process of the Fe₄₀Mn₄₀Co₁₀Cr₁₀ alloy up to 40.4 GPa. The lattice constant, atomic volumes, bulk modulus, and volume fraction of the fcc and hcp phase were obtained during compression and decompression. These results can expand our understanding of the structure evolution and properties of multi-principal element alloys under extreme conditions such as high pressure, which is contribute to the development of new metastable structural materials.

在这项研究中，我们系统地研究了高压多态性相变过程中铁₄₀的Mn ₄₀钴₁₀铬₁₀通过六面体压力设备和高压同步加速器角度散射X射线衍射技术多主元素合金。通过六面体压力设备在 5 GPa 高压处理后观察到样品的面心立方 (fcc) + 六方密堆积 (hcp) 纳米层压结构的混合物。特别是，HCP板条与在交叉路口区域中的新的辅助的hcp相相互作用结构样品中被发现。透射电子显微镜（TEM）分析显示，自FCC到HCP的过渡是由Shockley不全位错的滑移来完成的。此外，原位同步加速器角度散射X射线衍射技术进行检测的Fe的相变过程₄₀的Mn ₄₀钴₁₀铬₁₀合金高达40.4 GPA。压缩和解压缩过程中获得的晶格常数，原子体积，体积弹性模量，以及FCC和HCP相的体积分数。这些结果可以扩大结构演变和在极端条件下的多主元素合金例如高压的特性，这是有助于新亚稳结构材料的发展的理解。