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为评价辐照对B_4C/Al中子吸收材料力学性能的影响,测试了B_4C/Al中子吸收材料辐照前后的硬度、拉伸性能,并采用扫描电子显微镜(SEM)进行断口观察和显微组织分析,探讨断裂机理。结果表明:辐照后B_4C/Al中子吸收材料洛氏硬度升高,屈服强度上升37 MPa,抗拉强度上升32 MPa,断裂伸长率下降3.6%;辐照前后B_4C/Al中子吸收材料拉伸试样均为脆性断裂;辐照后Al基体的位错增殖以及B_4C颗粒与Al基体界面变化是导致B_4C/Al中子吸收材料力学性能提高的主要原因。
To evaluate the effect of irradiation on the mechanical properties of B_4C / Al neutron absorber, the hardness and tensile properties of B_4C / Al neutron absorber before and after irradiation were tested. The fracture observation and microscopic observation were carried out by scanning electron microscope (SEM) Organizational analysis to explore the fracture mechanism. The results show that the Rockwell hardness of B_4C / Al neutron absorber increases after radiation, the yield strength increases by 37 MPa, the tensile strength increases by 32 MPa and the elongation at break decreases by 3.6%. The B_4C / Al neutron absorber The tensile specimens were brittle fracture. The dislocation propagation of Al matrix and the change of interface between B 4 C particles and Al matrix were the main reasons for the improvement of mechanical properties of B 4 C / Al neutron absorber.