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Updated: Jun 23, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Temperature-dependent γ' kinetic evolution and elemental partitioning in a novel CoNi-based superalloy: an integrated
Kunning Niu1,2, Zan Zhang1,2, Peng Sang1,2
1Jiangsu Belight Laboratory, State Key Laboratory of Advanced Casting Technologies, Nanjing University of Science and Technology, Nanjing, 210094, China. ysli@njust.edu.cn.
Abstract:
Co-Ni-based γ/γ' superalloys are promising candidates for next-generation turbine blades, yet achieving high γ' stability and low density remains a significant challenge. This study presents a physics-constrained, integrated CALPHAD-phase-field methodology to design a novel Co-36Ni-15Al-3Ti (at%) alloy with an ultra-low density of 8.06 g cm-3. By implementing a screening framework governed by seven distinct thermodynamic and kinetic criteria, we successfully eliminated deleterious TCP phases while maintaining a high γ' volume fraction of 70%. A transformative concept, temperature-activated microstructural adaptability, is introduced, where elevated temperatures from 1074 to 1124 K trigger a reversible redistribution of Ti and Al atoms between the γ and γ' phases. Phase-field simulations validated by experimental characterization reveal that this element redistribution dynamically optimizes the lattice mismatch from 0.803% to 0.725%, effectively balancing the internal elastic strain and interfacial energy. Consequently, the alloy exhibits an exceptional yield strength of 1275 MPa at a high temperature, surpassing conventional Co-Al-W-based superalloys and showing superior strength than the commercial Ni-based single crystals. This work provides a generalized paradigm for designing adaptive, high-performance structural materials through the synergy of multi-component thermodynamic and kinetic evolution.
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