论文部分内容阅读
B4C中B的同位素10B具有较大的热中子吸收截面,是良好的中子吸收体。采用放电等离子烧结法(SPS)制备了B4C体积分数为10%~40%的B4C/6061Al中子吸收复合材料,对B4C/6061Al中子吸收复合材料的微观组织形貌及物相组成进行了观察分析,并测试了其拉伸性能。研究结果表明:B4C颗粒均匀地分布在6061Al基体中,颗粒尖端放电产生的等离子体能够促进B4C颗粒/6061Al基体界面结合,材料内部的物相主要有Al、B4C、Al B2和Al3BC。随着B4C体积分数的增加,B4C/6061Al中子吸收复合材料的致密度降低,抗拉强度呈现先增加后降低的趋势,断裂机制主要为6061Al基体及B4C颗粒/6061Al基体界面的撕裂。
The isotope 10B of B in B4C has a large thermal neutron absorption cross section and is a good neutron absorber. The B4C / 6061Al neutron absorbing composites with B4C volume fraction of 10% ~ 40% were prepared by spark plasma sintering (SPS), and the microstructure and phase composition of the B4C / 6061Al neutron absorber composites were observed Analyzed and tested its tensile properties. The results show that the B4C particles are uniformly distributed in the 6061Al matrix, and the plasma generated by the tip discharge can promote the bonding of the B4C particles to the 6061Al matrix. The internal phases of the particles are Al, B4C, AlB2 and Al3BC. With the increase of the volume fraction of B4C, the density of B4C / 6061Al neutron absorber composites decreased, tensile strength first increased and then decreased, and the fracture mechanism mainly consisted of tearing of 6061Al matrix and B4C particles / 6061Al matrix interface.