摘要
采用渗流铸造工艺制备了钨丝增强不同Nb含量的Zr基金属玻璃复合材料,利用X-Ray衍射、扫描电镜以及电子探针考察了复合材料界面反应和界面扩散情况,研究了基体合金中的Nb含量对复合材料界面反应和界面扩散的影响。结果表明:对Zr55Al10Ni5Cu30基复合材料,渗流时,钨丝与液相中的Zr发生界面包晶反应,生成W5Zr3界面相,并使界面位置向液相方向移动。在Zr55Al10Ni5Cu30合金的基础上添加Nb,发现Nb优先在钨丝界面偏聚,降低了Zr在钨丝界面的偏聚和活度,抑制钨丝与液相中的Zr包晶反应的发生,没有生成W5Zr3界面相,界面处只存在简单的扩散层。同时发现Zr元素在钨丝中的扩散系数降低,此时界面位置向钨丝方向移动。
Zr-based metallic-glass matrix composites, which were reinforced by continuous tungsten fibers, were prepared by melt infiltration casting. The interface reaction and diffusion were analyzed by using X-Ray diffraction, SEM and EPMA. The influence of Nb content of the matrix alloy on the interface reaction and diffusion was also investigated. The results illustrate that for the Zr55Al10Ni5Cu30 matrix composites an interface eutectoid reaction between W fiber and Zr in the liquid phase takes place and a W5Zr3 phase is formed at the interface. The interface moves to the direction of the liquid phase. For the matrix alloy containing Nb, the addition of Nb in the liquid causes a significant change of interface reaction. Nb in the liquid phase exhibits a preferential adsorption at the surface of the W fiber, thus reduces the adsorption of Zr atom in the liquid phase at the surface of the W fiber. The activity of absorbed Zr at interface is decreased, and depresses the interface eutectoid reaction between W fiber and liquid. In this case the interface is a simple diffusion layer only. At the same time the diffusion coefficient of Zr in the W is decreased by Nb addition and the interface moves to the direction of W fiber.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第7期1102-1105,共4页
Rare Metal Materials and Engineering
基金
"863"国家高技术发展计划项目(2001AA331010)
国家重大基础研究计划项目(G200067201-3)
国家自然科学基金项目(50071005
50171006)
北京市重大项目(H020420030320)
关键词
渗流铸造
金属玻璃
复合材料
界面反应
扩散
melt infiltration casting
bulk metallic glass
composite
interface reaction
interface diffusion
