材料科学
位错
高温合金
透射电子显微镜
滑倒
结晶学
变形(气象学)
压力(语言学)
复合材料
联轴节(管道)
冶金
相(物质)
滑翔机
凝聚态物理
微观结构
结构工程
纳米技术
化学
物理
语言学
哲学
有机化学
工程类
作者
Xiao Wang,Jun Zhao,Yidie Tan,Ze Zhang,Yunmin Chen,Hua Wei
标识
DOI:10.1016/j.jallcom.2024.173448
摘要
To model the centrifugal loads and complex geometries experienced by turbine blades during service, the nickel-based single crystal superalloy DD6 samples with a groove structure are designed and tested under the coupling conditions of high-speed rotating of 20,000 r/min and high temperature of 980 ℃. Scanning electron microscopy and transmission electron microscopy are used to analyze the microstructural evolution of γ-γ' phases and dislocation morphologies of 400 h and 1000 h samples. The results indicate that microstructural degradation of the γ-γ' phase attributes to the larger centrifugal tensile stress S11 in the applied physical stress compositions until deformation occurs. Our observations suggest that a/2 < 101 > -type dislocations initiate plastic deformation by slipping within the γ phase. However, their movement is constrained at the interface between the γ and γ' phases, resulting in their tendency to aggregate at this boundary. After the formation of stable interfacial dislocation networks, these dislocations then react to generate either a< 010 > -type dislocations or a/2 < 112 > -type dislocations, which cut into the γ' phase. However, under high stress conditions, the a/2 < 101 > -type dislocations are primarily cut directly in the form of dislocation pairs.
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