| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
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| Symposium
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Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
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| Presentation Title |
Investigating Deformation Mechanisms in Ni-based Superalloys with Compact γ'- γ" Coprecipitates |
| Author(s) |
Semanti Mukhopadhyay, Hariharan Sriram, Richard DiDomizio, Andrew Detor, Robert Hayes, Gopal B. Viswanathan, Yunzhi Wang, Michael Mills |
| On-Site Speaker (Planned) |
Semanti Mukhopadhyay |
| Abstract Scope |
Compact coprecipitate morphology in IN718 based alloys, consisting of γ'' phase on all {100} faces of cuboidal γ' precipitates, has been shown to possess superior coarsening resistance. A microstructure consisting of such a coarsening resistant morphology of γ' and γ'' coprecipitates was stabilized in two IN718-variant alloys through careful control of alloy chemistry and processing parameters. Detailed mechanical characterization of these alloys and consequent deformation mechanisms operative in these novel IN718-based superalloys will be discussed. Results from in-situ high-temperature tensile tests and ex-situ high-resolution characterization of creep deformed microstructures (DC-STEM, HR-STEM) will be utilized to investigate the deformation behavior of the alloys across different length scales. The findings will be complemented with the microstructural characterization of creep deformed conventionally processed IN718. The experimental findings will be supplemented with results from a microscopic phase-field model. |