V与Ce微量添加对Al0.5CoCu0.5NiSi系轻质高熵合金组织与力学性能的影响

Influence of V and Ce Micro Addition on Microstructure and Mechanical Properties of Al0.5CoCu0.5NiSi Light-weight High Entropy Alloys

研究制备Al0.5CoCu0.5NiSi（V、Ce）系列轻质高熵合金。分析了微量添加V与Ce对合金组织与力学性能的影响。结果表明：Al0.5CoCu0.5NiSi轻质高熵合金的物相结构为AlNi基bcc固溶体相＋Ni2Si或Co2Si基δ脆性相。加入V或V和Ce微合金化后,最强衍射峰左移,晶格常数变大,但物相结构均保持不变。母合金抗压强度为1298MPa、断裂应变为2.22%、合金的塑性变形很小。加入V后,该合金的抗压强度相比母合金提高了将近270MPa、断裂应变为2.84%。在含V高熵合金中加入Ce后,该合金的抗压强度与母合金相当,断裂应变为4.29%。整体上3种合金的强度较高、塑性较差,可制备成粉末用于金属表面防护。

The preparation of Al0.5CoCu0.5NiSi（V,Ce） series light-weight high entropy alloys was researched. The influence of micro addition V and Ce on the microstructure and mechanical properties of the alloy was studied. The results show that the phase structure of Al0.5CoCu0.5NiSi alloy is Al Ni-based bcc solid solution phase＋Ni2Si or Co2Si-based δ brittle phase. After micro-alloyed with trace V or V and Ce, the strongest diffraction peak shifts to the left and the lattice constant increases, but the phase structure remains unchange; the compressive strength of the matrix alloy is 1298 MPa, the fracture strain is 2.22%, and the plastic deformation of the alloy is very small. After the addition of V, the compressive strength of the alloy increases nearly 270 MPa compared with that of the matrix alloy, the fracture strain is 2.84%. After adding Ce to the high entropy alloy with V, the compressive strength of the alloy is comparable to that of the matrix alloy and the fracture strain is4.29%. The strengths of the three alloys are high, but the plasticities are poor as a whole, which could be used for the metals surface protection by prepared into powders.