【摘要】 通过电磁感应加热和液态金属冷却相结合的实验方法制备了Ti-45%Al(at%)包晶合金的定向凝固试样,并观察在不同生长速度下的微观组织和界面形态。结果发现,抽拉速度为10μm/s时,界面以胞晶形式生长,最终组织的α2+γ片层与生长方向垂直;抽拉速度为50μm/s时,观察到明显的枝晶生长界面,α2+γ片层与生长方向成45°夹角。低速下的胞状间距明显大于高速下的枝晶间距,说明快速凝固有利于减小枝晶间距。更多还原

【Abstract】 The experimental method connecting electromagnetic induction heating with liquid melting cooling was used to study microstructure and morphologies of directionally solidified Ti-45%Al (at%)peritectic alloy at different growth velocities.The results show that the interface morphology grows in cellular form when growth velocity is 10 μm/s, and the angel between the lamellar boundaries(α2+γ) and growth direction is 90°. However, when growth velocity is 50μm/s, the crystals grow in dendritic form, and the angel between the lamellar boundaries(α2+γ) in the grains and growth direction is 45°.The cellular spaces are bigger than dendritic spaces,which shows that the rapidly solidified process is good for minishing grain spaces in the directional solidification.更多还原