NiAl-1.5at%W共晶合金定向凝固组织控制与W介纳米丝形貌  

Directional Solidification Microstructure Control of Ni Al-1.5at%W Eutectic Alloy and Morphology of W Meso-nanowires

作　　者：任海果[1] 王文佳[1] 高建军[1] 阎光明[1] 赵志龙[1] 

机构地区：[1]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2016年第1期222-226,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51374173)

摘　　要：在300 K/cm的温度梯度条件下,实施不同抽拉速率下的Ni Al-1.5at%W共晶合金定向凝固。分析研究抽拉速率对W纤维相相间距、纤维相尺寸的影响规律。并使用盐酸双氧水溶液对Ni Al基体进行选择性溶解,制备出当量直径小于500 nm的钨纤维丝束。结果表明:随着抽拉速率的增大,W纤维相截面形状圆度增加,W纤维相相间距和W纤维相截面当量直径均减小,两者的比值在6.12到7.54之间。经选择性溶解获得的W纤维具有多样的三维形貌,呈现出薄带状、珍珠串状和搭接状,发现其形貌与抽拉速率有关。Under a temperature gradient of 300 K/cm, Ni Al-1.5at%W eutectic samples were directionally solidified at different drawing rates. The effect of the drawing rates on the spacing and the size of W fiber phases was analyzed. In addition, the Ni Al matrix was selectively etched by a solution of HCl：H2O2 to prepare the tungsten fiber filaments with the equivalent diameter less than 500 nm. The results show that with the drawing rate increasing the roundness of W fiber phase cross-section increases, while the spacing as well as the equivalent diameter of W fiber phase both decreases, and the ratio between them is in the range of 6.12 to 7.54. The tungsten fibers obtained by selective dissolution have the diversiform three-dimensional morphologies, such as the thin strip, pearl string and lapping state, and it is found that those shapes are related to the drawing rate.

关 键 词：介纳米金属丝 定向凝固 共晶合金 选择性溶解 

分 类 号：TG139[一般工业技术—材料科学与工程]