Abstract
Phase stability, elastic, and thermodynamic properties of (Co,Ni)3(Al,Mo,Nb) with the L12 structure have been investigated by first-principles calculations. Calculated phonon density of states show that (Co,Ni)3(Al,Mo,Nb) is dynamically stable, and calculated elastic constants indicate that (Co,Ni)3(Al,Mo,Nb) possesses intrinsic ductility. Young’s and shear moduli of the simulated polycrystalline (Co,Ni)3(Al,Mo,Nb) phase are calculated using the Voigt–Reuss–Hill approach and are found to be smaller than those of Co3(Al,W). Calculated electronic density of states depicts covalent-like bonding existing in (Co,Ni)3(Al,Mo,Nb). Temperature-dependent thermodynamic properties of (Co,Ni)3(Al,Mo,Nb) can be described satisfactorily using the Debye–Grüneisen approach, including heat capacity, entropy, enthalpy, and linear thermal expansion coefficient. Predicted heat capacity, entropy, and linear thermal expansion coefficient of (Co,Ni)3(Al,Mo,Nb) show significant change as a function of temperature. Furthermore the obtained data can be used in the modeling of thermodynamic and mechanical properties of Co-based alloys to enable the design of high temperature alloys.
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ACKNOWLEDGMENTS
This work is funded by the National Natural Science Foundation of China through grant No. 51201074. Q. Yao acknowledges the support from Jiangsu Government Scholarship for Overseas Studies. The efforts at the Pennsylvania State University were partially supported by the National Science Foundation under grants DMR-1006557 and CMMI-1333999. First-principles calculations were carried out on the LION clusters at the Pennsylvania State University supported by the Materials Simulation Center and the Institute for CyberScience. Calculations were also carried out on the CyberStar cluster funded by the NSF through Grant No. OCI-0821527.
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Supplementary material: Phase stability, elastic and thermodynamic properties of L12 (Co,Ni)3(Al,Mo,Nb) phase from first-principles calculations (approximately 1.12 MB)
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Yao, Q., Shang, SL., Wang, K. et al. Phase stability, elastic, and thermodynamic properties of the L12 (Co,Ni)3(Al,Mo,Nb) phase from first-principles calculations. Journal of Materials Research 32, 2100–2108 (2017). https://doi.org/10.1557/jmr.2017.8
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DOI: https://doi.org/10.1557/jmr.2017.8