Effect of Al2O3np on the Properties and Microstructure of B4Cp/Al Composites  

作　　者：LIU Tingting PANG Xiaoxuan XIAN Yajiang LUO Hao ZHANG Pengcheng 刘婷婷;PANG Xiaoxuan;XIAN Yajiang;LUO Hao;ZHANG Pengcheng(Institute of Materials,China Academy Engineering Physics,Mianyang 621907,China;Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang 621700,China)

机构地区：[1]Institute of Materials,China Academy Engineering Physics,Mianyang 621907,China [2]Science and Technology on Surface Physics and Chemistry Laboratory,Mianyang 621700,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第3期514-519,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Natural National Science Foundation of China(NSFC)(No.11305149);National High-Tech R&D Program(863 Program)(No.2013AA030704)。

摘　　要：Aluminum-matrix boron carbide (B4Cp/Al) is a kind of neutron absorbing material widely used in nuclear spent fuel storage. In order to improve the tensile property of B4Cp/Al composites, a new type of nano-Al2O3 particle (Al2O3np) reinforced B4Cp/Al + Al2O3np composites were prepared by powder metallurgy method. The Monte Carlo particle transport program (MCNP) was used to determine the influence of Al2O3np on the thermal neutron absorptivity of composites. The universal material testing machine and scanning electron microscope (SEM) were used to study the mechanical properties, microstructure and fracture morphology of B4Cp/Al composites. The results indicated that the neutron absorption properties of B4Cp/Al composites were not affected by the addition of nano-Al2O3 particles in the range of 1 wt%-15 wt%. The addition of Al2O3np can obviously reduce the grain size of B4Cp/Al matrix metals thus improve the tensile strength of the composites. The addition threshold of Al2O3np is about 2.5 wt%. Both B4Cp and Al2O3np change the fracture characteristics of the composites from toughness to brittleness, and the latter is more important.

关 键 词：B4Cp/Al composites nano-Al2O3 particles PROPERTIES MICROSTRUCTURE 

分 类 号：TB33[一般工业技术—材料科学与工程]