کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
776832 | 1463763 | 2014 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Localized microtwin formation and failure during out-of-phase thermomechanical fatigue of a single crystal nickel-based superalloy Localized microtwin formation and failure during out-of-phase thermomechanical fatigue of a single crystal nickel-based superalloy](/preview/png/776832.png)
The deformation and damage mechanisms of a single crystal nickel-based superalloy CMSX-4 have been investigated under out-of-phase thermomechanical fatigue (OP TMF) condition. The deformation was highly localized to the area near the crack tip, where multiple groups of parallel twin plates on {1 1 1} planes formed during the high temperature-compressive half cycle. The atomistic a/6 〈1 1 2〉 twinning shear-based approach is presented which explains the origin of twinning. The localized twins provided a preferential path for crack propagation. OP TMF deformation was dominated by partial dislocation movement with {1 1 1}〈1 1 2〉 slip system, resulting in the formation and propagation of deformation twins.
► The deformation was highly localized to area near crack tip.
► The localized twins provided a preferential crack path during OP TMF cycling.
► The atomistic approach is presented to explain the origin of twinning.
► OP TMF deformation was dominated by partial dislocation movement with {1 1 1}〈1 1 2〉 slip system.
Journal: International Journal of Fatigue - Volume 69, December 2014, Pages 22–27