硼含量对(Fe,Ni)_3V合金组织和力学性能的作用  

Effect of B content on structure and mechanical properties of(Fe,Ni)_3V alloy

作　　者：侯锡贝 陈业新[1] 

机构地区：[1]上海大学微结构重点实验室,上海200444

出　　处：《上海大学学报（自然科学版）》2015年第5期648-656,共9页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51271102)

摘　　要：研究了室温下硼含量对无序态和有序态(Fe,Ni)_3V合金在真空中拉伸时的力学性能及断裂方式的作用.结果表明,随着(Fe,Ni)_3V合金中硼含量的增加,合金的晶粒尺寸持续细化,合金的最大抗拉强度和延伸率随之提高.硼原子对有序态合金力学性能的作用要大于无序态合金,有序态(Fe,Ni)_3V合金断裂方式随硼含量的变化表明硼原子在晶界上提高了晶界的强度.晶粒尺寸的细化提高了无序态(Fe,Ni)_3V合金的力学性能,而有序强化效应及硼原子改善晶界性质、细化晶粒的共同作用提高了有序态(Fe,Ni)_3V合金的力学性能.The mechanical properties and fracture mode of disordered and ordered （Fe, Ni）3V Mloys with different boron contents in vacuum at the ambient temperature are studied. The results show that the grain size decreases continuously, and tensile strength and elongation increase with the increase of the boron content in the disordered and ordered （Fe, Ni）3V alloys. The effect of boron content on the mechanical properties of the ordered （Fe, Ni）3V alloy is significantly larger than that of the disordered （Fe, Ni）3V alloy. It is deduced by the fracture surface morphology varying with the boron content in the ordered （Fe, Ni）3V alloy that the change of the fracture mode is attributed to the segregation of boron on the grain boundary, thereby increasing strength of the grain boundary. Increases of the mechanical properties of the disordered （Fe, Ni）3V alloy come from the effect of the grain size decrease. The increases of the mechanical properties of the ordered （Fe, Ni）3V alloy are attributed to the joint effect of ordered strengthening, decreasing the grain size and improving the property of the grain boundary by boron atom.

关 键 词：无序态 有序态 (Fe Ni)3V合金 硼 力学性能 

分 类 号：TG115.5[金属学及工艺—物理冶金] TG146[金属学及工艺—金属学]