镍基单晶高温合金界面位错网在剪切载荷作用下的演化

Evolution of interphase misfit dislocation networks in Ni-based single crystal superalloy under shear loading

运用分子动力学方法,研究了镍基单晶高温合金γ/γ′相界面错配位错网在剪切载荷作用下的演化特征.结果表明(100),(110)和(111)三种相界面形成的位错网在载荷作用下有不同形式和不同程度的损伤,其变形和损伤随温度的增加而增加.在相同的剪切载荷和温度作用下,(100)相界面形成的正方形位错网最稳定.

The molecular dynamics simulation is used to study the evolution of misfit dislocation networks at γ /γ＇ phase interfaces of Ni-based single crystal superalloy under shear loading.From the simulation we found that the three patterns of dislocation networks on the（100）,（110） and（111） phase interfaces show different degrees and patterns of damage.The deformation and damage occur easier at a higher temperature.Under the same shear loading and temperature,the square dislocation network at（100） phase interface is the most stable.