摘要
研究了长期时效对一种镍基单晶高温合金γ′相形貌的影响。结果表明:合金在950℃时效100h后,γ′相正方度略有下降,500h后γ′相开始沿不同的[100]方向长大。合金在1050℃时效100h后,γ′相开始沿不同的[100]方向长大,长大速度明显高于950℃时效。γ/γ′相界面能和弹性应变能的降低是γ′相长大的驱动力,γ′相按Ostwald熟化方式长大,即大的γ′相长大,小的γ′相溶解,高温长期时效过程中无有害相析出,表明合金的组织是稳定的。
The effect of long time aging treatment on the structural evolution of γ′ phase was investigated. The results showed that the squareness of γ′ phase is slightly reduced when aged at 950℃for 100 hours, then γ′ began to grow in the direction of after aging for 500 hours. Whereas the γ′ began to grow in the direction of at 1 050℃ for only 100 hours. The growth rate is faster for the latter case. The interfacial energy of γ/γ′ phases and the reduction of elastic strain energy is the driven force for γ′phases growth. The γ′ phase grows according to Ostwald ripe mode, i.e. the larger γ′ phase continuously grows while the smaller γ′ phase dissolved into the larger one. No deleterious phase was detected during long time aging at high temperature, which indicated the stability of the microstructure of the alloy.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第3期10-12,15,共4页
Materials For Mechanical Engineering
关键词
单晶合金
时效
γ’相
single crystalline alloy
aging
γ′ phase
