GOALI: Localized Phase Transformation (LPT) Strengthening for Next-Generation Superalloys
Timothy Smith
Ni-base superalloys are critical enabling high-temperature structural materials that determine the efficiency and carbon footprint of a wide range of aerospace and land-based power generation systems such as gas turbines. This DMREF-GOALI project exploits a new design strategy that utilizes a localized phase transformation (LPT) phenomenon as a new “strengthening mechanism” to disruptively improve the high-temperature creep performance of Ni-base superalloys. These advances are being driven by advanced characterization and modeling in close collaboration with researchers at GE Research and NASA Glenn Research Center.
Publications
Quantitative Prediction of Suzuki Segregation at Stacking Faults of the γ' Phase in Ni-base Superalloys
L. S. Feng, Y. Rao, M. Ghazisaeidi, M. J. Mills, Y. Z. Wang
Generalized Stacking Fault Energy Surface Mismatch and Dislocation Transformation
L. S. Feng, M. J. Mills, Y. Z. Wang
Enhancing the Creep Strength of Next-Generation Disk Superalloys via Local Phase Transformation Strengthening in Superalloys 2020
T. M. Smith, T. P. Gabb, K. N. Wertz, J. Stuckner, L. J. Evans, A. J. Egan, M. J. Mills
Yielding Behavior of a Single-crystalline γ'-strengthened Co-Ti-Cr Superalloy
A. Bezold, N. Volz, M. Lenz, C. H. Zenk, E. Spiecker, M. Mills, M. Goken, S. Neumeier
Creep Behavior of Compact γ'-γ'' Coprecipitation Strengthened IN718-Variant Superalloy
S. Mukhopadhyay, H. Sriram, C. H. Zenk, R. DiDomizio, A. J. Detor, R. W. Hayes, G. B. Viswanathan, Y. Z. Wang, M. J. Mills
Stress-dependent Dislocation Core Structures Seading to Non-Schmid Behavior
D. Qiu, P. Y. Zhao, D. R. Trinkle, Y. Z. Wang
A General Phase-field Framework for Predicting the Structures and Micromechanical Properties of Crystalline Defects
D. Qiu, P. Y. Zhao, Y. Z. Wang
Utilizing Local Phase Transformation Strengthening for Nickel-base Superalloys
T. M. Smith, N. A. Zarkevich, A. J. Egan, J. Stuckner, T. P. Gabb, J. W. Lawson, M. J. Mills
Can Experiment Determine the Stacking Fault Energy of Metastable Alloys?
X. Sun, S. Lu, R. Xie, X. An, W. Li, T. Zhang, C. Liang, X. Ding, Y. Wang, H. Zhang, L. Vitos
Shearing Mechanisms of Co-precipitates in IN718
C. H. Zenk, L. S. Feng, D. McAllister, Y. Z. Wang, M. J. Mills
Rationalisation of the Micromechanisms Behind the High-Temperature Strength Limit in Single-Crystal Nickel-Based Superalloys in Superalloys 2020
D. Barba, A. J. Egan, Y. Gong, M. J. Mills, R. C. Reed
Effect of Nb Alloying Addition on Local Phase Transformation at Microtwin Boundaries in Nickel-Based Superalloys in Superalloys 2020
A. J. Egan, Y. Rao, G. B. Viswanathan, T. M. Smith, M. Ghazisaeidi, S. Tin, M. J. Mills