摘要
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。
This paper investigated the directional migration behavior of the alloying elements in the rafting process of the single crystal superalloy DD6 with [001] orientation under 300 MPa at 1000 °C. The microstructure of the single crystal superalloy DD6 was acquired by SEM. The results indicate that the rafting direction of γ′ phase is nearly perpendicular to stress axis. The matrix channel running parallel to the stress axis gets wider, but it will fade away gradually in vertical direction. Statistical analysis of the alloy components by TEM reveals the directional migrations of the elements Al, Re and W in the single crystal superalloy DD6. The element Al spreads to the matrix channel which is parallel to the stress axis, while Re and W diffuse to the matrix channel which is perpendicular to the stress axis, and obviously concentrate in the crossing area of the above mentioned channels.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期1147-1151,共5页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51210008)
关键词
NI基合金
蠕变
定向迁移
扩散
Ni-based superalloys
creep
directional migration
diffusion
