DD402/FGH95扩散偶中单晶合金<i>γ</i>'相筏形化与其形成元素的扩散

DD402/FGH95扩散偶中单晶合金γ'相筏形化与其形成元素的扩散

摘要: 通过研究不同温度时热等静压(HIP)多元扩散偶DD402/FGH95中的A1,Ta和Ti元素的扩散规律,发现DD402单晶中存在A1和Ta元素的上坡扩散.因此单晶中在近结合界面处形成了A1,Ta和Ti元素的富集区以及γ'相的筏形化.对A1和Ta元素的扩散流量及扩散深度进行计算.计算结果与试验结果相吻合.

Abstract: Regularities of interdiffusion of Al, Ti and Ta for DD402/FGH95 couple during HIP at different temperatures were studied. The up-hill diffusion flux of Al and Ta in single crystal DD402 was found. As a result, a rich zone of γ'phase forming elements and rafted γ'phase were developed in single crystal DD402 close to the bonded interface. The diffusion fluxes and diffusion depths of Al and Ta were calculated. The calculated results were corresponding to those the experiments.