A family of high-entropy alloys (HEA) composed of 3d-transitional metals is attracting great interest due to the mechanical, magnetic, and electrical properties that are valuable in the development of advanced structural and functional materials. In this work, we studied X-CoCrFeNi HEAs, where X = Al, Ti, or Cu, produced by mechanical alloying by means of high-energy ball milling. Powder mixture composed of elemental metal powders transforms in a homogeneous alloy (super-saturated solid solution) due to the intense diffusion which takes place during friction and shear deformation of the metal particles during the mechanical alloying. The thermal stability of the HEA phases was experimentally studied in the range 873-1273 K using high-temperature X-ray diffraction and compared with the results of thermodynamic calculations (Calphad).

由 3d 过渡金属组成的高熵合金 (HEA) 家族因其在先进结构和功能材料的开发中非常有价值的机械、磁和电特性而引起了极大的兴趣。在这项工作中，我们研究了通过高能球磨机械合金化生产的 X-CoCrFeNi HEAs，其中 X = Al、Ti 或 Cu。由于在机械合金化过程中金属颗粒的摩擦和剪切变形期间发生的强烈扩散，由元素金属粉末组成的粉末混合物转变为均质合金（过饱和固溶体）。使用高温 X 射线衍射在 873-1273 K 范围内对 HEA 相的热稳定性进行了实验研究，并与热力学计算 (Calphad) 的结果进行了比较。