摘要
采用真空热压后轧制的方法(VHPR)成功制备了混合粒径增强的B4C/6061Al中子吸收材料,B4C含量分别为0%、20%、30%和40%(体积分数)。对中子吸收材料的微观组织形貌及其界面行为进行了观察,对材料的拉伸强度及断口进行了测试分析,对强化机理进行了讨论。结果表明:6061Al基体构成了空间网络结构,界面结合处为冶金结合,界面扩散层厚度可达5μm,随着B_4C颗粒含量的增加,中子吸收材料内部小粒径B_4C颗粒出现了局部的团聚现象。中子吸收材料的强度呈现先增大后减小的趋势,断裂方式主要为沿界面开裂和B_4C颗粒的解理断裂。中子吸收材料经过多道次的轧制以后,基体铝晶粒得到细化,在B_4C颗粒周围出现了大的塑性变形区,轧制同时也提高了B_4C颗粒在基体铝中的分布均匀性,减少材料内部缺陷。
B_4C/6061 Al neutron absorber materials with four volume fractions（0%,20%,30% and 40%） were fabricated by vacuum hot pressing and following hot rolling（VHPR） in atmospheric environment.Microstructure and interface behavior of the neutron absorber materials were studied.Besides,the tensile strength,fracture behavior and strengthening mechanism of the materials were also investigated.The results show that the space network of the matrix is constructed by 6061 Al.The interface reaches metallurgical bonding state and the thickness of the diffusion layer is about 5 mm.With the increase of the volume fraction of B_4 C,some small B_4 C particles agglomerate locally,and the tensile strength firstly increases and then decreases.The main fracture behaviors are interface fracture and cleavage fracture of B_4 C particles.After multi-pass hot rolling,the grains of the matrix materials are refined and the distribution of B_4 C particles is also improved;in addition,internal defects are reduced and plastic deformation zones around B_4 C particles also form after hot rolling.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第7期1842-1847,共6页
Rare Metal Materials and Engineering
基金
山西省科技攻关项目(20130321024)
