高熵合金颗粒增强铜基复合材料中基于过渡层结构的元素扩散路径调整（英文）

Modifying element diffusion pathway by transition layer structure in high-entropy alloy particle reinforced Cu matrix composites

采用机械合金化和烧结法制备Al0.3CoCrFeNi高熵合金(HEA)颗粒增强铜基复合材料(CMCs)。采用多步球磨法获得过渡层结构,研究过渡层结构对铜基复合材料中元素扩散行为和材料磨损性能的影响。结果表明,通过多步球磨法得到厚度约为5μm的新铜过渡层。铬元素通过过渡层扩散到界面中,形成复合氧化物。由于铜过渡层的存在,Ni、Co和Fe的扩散率增大,尤其是Ni元素。该方法制备的CMCs与无过渡层结构的CMCs相比,耐磨性提高了30%,这是由于界面结合强度得到提高。该方法可用于开发先进的HEA增强金属基复合材料。

The Al0.3CoCrFeNi high-entropy alloy(HEA)particles reinforced Cu matrix composites(CMCs)were fabricated by mechanical alloying and sintering.Transition layer structure was obtained by multi-step ball milling to investigate the related influence on element diffusion behavior and wear properties of CMCs.The results indicate that a new Cu transition layer is generated,and the thickness is about 5μm.Cr element diffuses into the interface via the transition layer,which forms the complex oxide.Because of the structure of Cu transition layer,the diffusion rates of Ni,Co and Fe increase,especially the Ni element.The wear resistance of CMCs is improved by 30%,which is due to the improvement of interface bonding strength,compared with the CMCs without transition layer.This method is applicable to the development of advanced HEA reinforced metallic matrix composites.