niobium silicide 中文意思是什麼
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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
隨著抽拉速率的提高和硅化鈮強化相間距與尺度的減小，材料的室溫拉伸強度和斷裂韌性均有提高， _ b最高可達778 . 4mpa ， k _ （ ic ）達到了46 . 3mpa ? m ~ （ 1 / 2 ） ；試樣的拉伸斷口基本表現為脆性解理斷裂的花樣，裂紋沿基體強化相界面繞過強化相進行擴展，在裂紋擴展方向存在解理臺階，並形成撕裂棱。 -
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
本文採用真空電弧自耗熔煉法制備了鈮?硅基rmics材料的母合金錠，並採用電子束區熔（ ebfzm ）高溫度梯度定向凝固裝置制備了定向效果良好的nb - nb _ 3si nb _ 5si _ 3共晶自生復合材料，並對其定向凝固工藝參數和組織之間的對應規律、組織特性進行了研究，探討了凝固組織對室溫力學性能的影響及其斷裂機制。
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