niobium silicide meaning in English
硅化铌
Examples
- In this paper , an ingot of niobium - niobium silicide based in - situ composites ( rmics ) was prepared by arc melting process , and nb - nb3si / nb5si3 in - situ composites with a uniformly orientated microstructure were produced in a high temperature gradient directional solidification apparatus named electron beam floating zone melting ( ebfzm ) . the relationships between the processing parameters and the characteristics of the solidified microstructure have been investigated . the influence of the microstructure on the mechanical properties has been revealed and the rupture mechanism at room temperature has been discussed
本文采用真空电弧自耗熔炼法制备了铌?硅基rmics材料的母合金锭，并采用电子束区熔( ebfzm )高温度梯度定向凝固装置制备了定向效果良好的nb - nb _ 3si nb _ 5si _ 3共晶自生复合材料，并对其定向凝固工艺参数和组织之间的对应规律、组织特性进行了研究，探讨了凝固组织对室温力学性能的影响及其断裂机制。 - The cracks extend along the matrix / strengthening - phases interfaces and form the cleavage steps and tear ridges . there appear some very small dimples on the fracture surfaces of the directionally solidified samples , which come from the nb - based solid solution particles in the big plates of the strengthening phases , but no dimples on the fracture surfaces of the as - cast sample . it can be concluded from above results that niobium - niobium silicide based in - situ composites ( rmics ) with a uniformly orientated microstructure can be produced by the ebfzm with high temperature gradient , and their mechanical properties can be increased
随着抽拉速率的提高和硅化铌强化相间距与尺度的减小，材料的室温拉伸强度和断裂韧性均有提高， _ b最高可达778 . 4mpa ， k _ ( ic )达到了46 . 3mpa ? m ~ ( 1 / 2 ) ；试样的拉伸断口基本表现为脆性解理断裂的花样，裂纹沿基体强化相界面绕过强化相进行扩展，在裂纹扩展方向存在解理台阶，并形成撕裂棱。