CF-B4C/Al中子吸收复合材料的微观组织及力学行为

Microstructure and mechanical behavior of CF-B_(4)C/Al neutron absorbing composites

基于B_(4)C良好的中子吸收性能和碳纤维(CF)慢化中子的性能,采用真空热压烧结方法制备了集结构与功能一体具有不同CF含量的CF-B_(4)C混合增强6061Al基复合材料,并对热轧后的组织形貌和力学性能进行分析。结果表明,大变形量热轧后B_(4)C颗粒和CF分布较均匀,没有出现大面积的聚集现象,但是少量B4C颗粒和CF在轧制压力的作用下发生了断裂。当变形量达到60%时,复合材料的抗拉强度可达(265±3)MPa,与6061Al合金的抗拉强度相比,不同厚度的CF-B_(4)C/Al复合材料的抗拉强度分别提高了80%和112%。随着CF含量的增加,CF-B_(4)C/Al复合材料的强度和延伸率均减小。当CF含量达到5wt%时,断裂的主要原因是有纤维的聚集及纤维沿断裂方向排布。

Based on the good neutron absorption property of B_(4)C and the moderated neutron property of carbon fiber(CF),CF-B_(4)C mixed-reinforced 6061 Al matrix composites with different CF contents were prepared by vacuum hot pressing sintering method.The microstructure and mechanical properties of the composites were analyzed.After hot rolling with large deformation,the B_(4)C particles are distributed evenly without large area of particle aggregation,but a small amount of B4 C particles and CF are brittle.When the deformation reaches 60%,the tensile strength of the material can reach(265±3)MPa.Compared with the tensile strength of 6061 Al alloy,the tensile strength values of CF-B_(4)C/Al composites with different thicknesses increase by 80%and 112%respectively.With the increase of CF content,the strength and elongation of CF-B_(4)C/Al composites decrease.When the content of CF reaches 5 wt%,the main reason of fracture is the aggregation of fibers and the arrangement of fibers along the fracture direction.