Elastic-plastic behavior of nickel-based single crystal superalloys with γ-γ′phases based on molecular dynamics simulations  

作　　者：Jing-Zhao Cao Yun-Guang Zhang Zhong-Kui Zhang Jiang-Peng Fan Qi Dong Ying-Ying Fang 曹景昭;张云光;张中奎;范江鹏;董琪;方盈盈

机构地区：[1]School of Science,Xi’an University of Posts and Telecommunications,Xi’an 710121,China

出　　处：《Chinese Physics B》2025年第4期510-521,共12页中国物理B(英文版)

基　　金：Project supported by the Xi’an Science and Technology Plan Project of Shaanxi Province of China(Grant No.23GXFW0086).

摘　　要：The effects of temperature and Re content on the mechanical properties,dislocation morphology,and deformation mechanism of γ-γ′phases nickel-based single crystal superalloys are investigated by using the molecular dynamics method through the model of γ-γ′phases containing hole defect.The addition of Re makes the dislocation distribution tend towards the γ phase.The higher the Re content,the earlier theγphase yields,while the γ′phase yields later.Dislocation bends under the combined action of the applied force and the resistance of the Re atoms to form a bend point.The Re atoms are located at the bend points and strengthen the alloy by fixing the dislocation and preventing it from cutting the γ′phase.Dislocations nucleate first in the γ phase,causing theγphase to deform plastically before the γ′phase.As the strain increases,the dislocation length first remains unchanged,then increases rapidly,and finally fluctuates and changes.The dislocation lengths in the γ phase are larger than those in the γ′phase at different temperatures.The dislocation length shows a decreasing tendency with the increase of the temperature.Temperature can affect movement of the dislocation,and superalloys have different plastic deformation mechanisms at low,medium and high temperatures.

关 键 词：nickel-based single crystal superalloys elastic-plastic behavior dislocations molecular dynamics simulation 

分 类 号：TG146.2[一般工业技术—材料科学与工程]