【摘要】 为探究双相增强体对铝基复合材料拉伸性能和断裂行为的影响，采用真空热压烧结工艺在580℃，30MPa条件下保温10min制备了FeCoCrNiAl高熵合金颗粒增强7075铝基复合材料（HEA_p/Al）,Ni-Co-P镀层修饰碳纤维增强7075铝基复合材料（CF/Al）和FeCoCrNiAl高熵合金颗粒及Ni-Co-P镀层修饰碳纤维混杂增强铝基复合材料（CF-HEA_p/Al）。并对不同复合材料微观结构及拉伸性能进行分析表征及比较。结果表明：CF-HEA_p/Al复合材料的屈服强度（YS）与极限拉伸强度（UTS）随纤维含量的升高（体积分数由0至40%）呈现先增大后降低的变化，延伸率则逐渐降低。鉴于Ni-Co-P镀层修饰碳纤维与FeCoNiCrAl高熵合金颗粒的混杂强化效应，CFHEA_p/Al复合材料的YS和UTS较HEA_p/Al与CF/Al复合材料明显提高，且其断口表现出基体韧性断裂及纤维拔出与断裂的多种失效特征。更多还原

【Abstract】 To investigate the effects of double-scaled reinforcements on the tensile properties and failure behavior of aluminium matrix composites, Ni-Co-P coated carbon fibers reinforced 7075Al matrix composites(CF/Al), Fe Co Cr Ni Al high-entropy alloy particles reinforced 7075Al matrix composites(HEA_p/Al) and Ni-Co-P coated carbon fibers and Fe Co Cr Ni Al high-entropy alloy particles hybrid reinforced 7075Al matrix composites(CF-HEA_p/Al) were fabricated by vacuum hot pressing sintering under the pressure of 30 MPa at 580 °C for 10 min. The microstructure and the fracture morphologies of the composites were observed, and the tensile properties of composites were characterized. Results show that the yield strength(YS) and ultimate tensile strength(UTS) of CF-HEA_p/Al composites are firstly increased and subsequently decreased with increasing the CFs content from 0vol% to 40vol%, while the elongation is decreased. Owing to the hybrid reinforcing effects of Ni-Co-P coated carbon fibers and Fe Co Cr Ni Al highentropy alloy particles, the YS and UTS of CF-HEA_p/Al composites have larger improvement compared with those of CF/Al and HEA_p/Al composites, and the fracture morphology is characterized by mixed rupture modes of ductile rupture of 7075Al matrix and fiber pull-out and fracture.更多还原