论文部分内容阅读
对[001]取向DD6单晶合金进行1000℃/300 MPa条件下的拉伸蠕变试验,以研究合金的筏化现象以及元素的定向迁移行为。SEM对合金显微组织的观察表明,γ′相在温度和应力的作用下发生了筏化,且筏化方向与应力轴垂直,同时平行于应力轴的基体通道变宽,垂直于应力轴的基体通道逐渐消失。TEM对合金的成分统计分析表明,合金中Al、Re、W元素发生了定向迁移,其中Al向与应力轴平行的基体通道扩散,而Re、W向与应力轴垂直的基体通道扩散,并主要富集于相互垂直的基体通道的交叉区域。
The tensile creep test of [001] oriented DD6 single crystal alloy at 1000 ℃ / 300 MPa was carried out to study the rafting phenomenon and the directional migration of the alloy. SEM observation of the alloy microstructure showed that the γ ’phase was rafted under the action of temperature and stress, and the direction of the raft was perpendicular to the stress axis. At the same time, the channel of the substrate parallel to the stress axis broadened, and the perpendicular to the stress axis The matrix channel disappeared. TEM analysis of the composition of the alloy showed that the Al, Re, W alloy elements were oriented migration, in which Al diffusion to the substrate axis parallel to the stress axis, and Re, W to the vertical distribution of the stress axis and the main channel, and the main Interactions in the cross-section of mutually perpendicular substrate channels.