1600 ℃下Mo合金-W涂层的互扩散行为研究

Interdiffusion Behavior of W Coating and Mo Alloy at 1600 ℃

摘要:

对W涂层和Mo合金在1600 ℃下的互扩散行为进行了研究，单晶样品长期（最长5000 h）高温退火后仍然保持单晶形貌，多晶材料W晶界多垂直于Mo表面方向。由线扫描结果：W向Mo基体的扩散深度大于Mo向W涂层的扩散深度。根据电子探针数据使用Den Broeder方法对Mo-W的互扩散系数进行了计算，1600 ℃时Mo-W的互扩散系数在10-15~10-16 cm2/s量级，且lnD与yW成线性关系，斜率为–1.82。

Abstract:

The interdiffusion behavior of W coating with Mo alloy at 1600 ℃ was studied, the monocrystal samples remained monocrystal feature without after long time (maximum of 5000 h) annealed, and grain boundary of polycrystal W was perpendicular to the surface of Mo. As the result of line scan of SEM: the diffusion depth of W in Mo was larger than that of Mo in W. The interdiffusion coefficient D of monocrystal Mo-W system was calculated with EPMA datas by the method of Den Broeder, and as the result: D was 10-15~10-16 cm2/s at 1600 ℃, lnD was linear relationship inverse of concentration of W, and the slope was –1.82.