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Xue, Fei
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Publications (4/4 displayed)
- 2024High-temperature insulating ferromagnetic state in charge-disproportionated and spin state-disproportionated strained SrCoO$_{2.5}$ thin filmcitations
- 2023Influence of the γ′ Volume Fraction on the High-Temperature Strength of Single Crystalline Co–Al–W–Ta Superalloyscitations
- 2022Anomalous Work Hardening Behavior of a Single Crystalline Co-Base Superalloycitations
- 2014Inversion Symmetry Breaking by Oxygen Octahedral Rotations in the Ruddlesden-Popper NaRTiO<sub>4</sub> Familycitations
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article
Anomalous Work Hardening Behavior of a Single Crystalline Co-Base Superalloy
Abstract
The defect evolution associated with an anomalous work hardening behavior of a single crystalline quaternary Co-Al-W-Ta superalloy at 950 °C was investigated by transmission electron microscopy. As plastic deformation is initially confined to the γ matrix channels, a plateau arises in the stress-strain curve after yielding. At about 1% plastic strain, extensive shearing of the γ′ precipitates under superlattice stacking fault formation occurs leading to extreme work hardening rates up to 12 GPa and a total increase in stress of about 200 MPa. Additional investigations on the temperature and strain-rate dependence of the anomalous work hardening behavior reveal the significance of diffusion and segregation processes on the stress-strain curve and the work hardening behavior.