会聚束电子衍射研究蠕变镍基高温合金中γ和γ’相的局域应变分布

CBED STUDY OF LOCAL STRAIN DISTRIBUTION IN γ and γ' PHASES OF A CREPT Ni BASE SUPERALLOY

用高分辨率会聚束电子衍射方法(CBED)测量了单晶镍基高温合金CMSX-6在980℃蠕变后γ和γ’两相中的弹性应变分布．测量表明在水平和垂直的γ通道中存在着弹性应变的差别,这种差别被认为是筏化的驱动力．在γ’相中还观察到弹性应变的不均匀分布．

The high lateral resolution covergent beam electron diffraction （CBED） method was applied to measure the local elastic strain distributions in the two phases γ, and γ^1 of the monocrystalline nickel base superalloy CMSX-6 crept at 980 ℃. CBED measurements show that there is a difference of elastic strain in the vertical and horizontal γ, channels, which is thought to be the driving force for rafting. An inhomogeneous distribution of elastic strain is also observed in the γ^1 phase.