Composition effect on elastic properties of model NiCo-based superalloys

doi:10.1088/1674-1056/ab6204

Abstract NiCo-based superalloys exhibit higher strength and creep resistance over conventional superalloys. Compositional effects on elastic properties of the γ and γ' phases in newly-developed NiCo-based superalloys were investigated by first-principles calculation combined with special quasi-random structures. The lattice constant, bulk modulus, and elastic constants vary linearly with the Co concentration in the NiCo solution. In the selected (Ni, Co)₃(Al, W) and (Ni, Co)₃(Al, Ti) model γ' phase, the lattice constant, and bulk modulus show a linear trend with alloying element concentrations. The addition of Co, Ti, and W can regulate lattice mismatch and increase the bulk modulus, simultaneously. W-addition shows excellent performance in strengthening the elastic properties in the γ' phase. Systems become unstable with higher W and Ni contents, e.g., (Ni_0.75Co_0.25)₃(Al_0.25 W_0.75), and become brittle with higher W and Co addition, e.g., Co₃(Al_0.25 W_0.75). Furthermore, Co, Ti, and W can increase the elastic constants on the whole, and such high elastic constants always correspond to a high elastic modulus. The anisotropy index always corresponds to the nature of Young's modulus in a specific direction.

Keywords: NiCo-based superalloys elastic constants special quasi-random structures (SQS) directional Young's modulus

Received: 07 June 2019
Revised: 13 December 2019
Accepted manuscript online:

PACS:	61.82.Bg	(Metals and alloys)
	62.20.-x	(Mechanical properties of solids)
	63.50.Gh	(Disordered crystalline alloys)
	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)

Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFB0701502).

Corresponding Authors: Chongyu Wang
E-mail: cywang@mail.tsinghua.edu.cn

Cite this article:

Weijie Li(李伟节), Chongyu Wang(王崇愚) Composition effect on elastic properties of model NiCo-based superalloys 2020 Chin. Phys. B 29 026102

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