First-principles study of a tungsten-free γ-γ' Co-Al-Mo-Nb class cobalt-based superalloy and the alloying effect of Ti addition

Zihan Wang, Jianxin Zhang*, Youjian Zhang, Huixin Jin, Wenyang Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The tungsten-free γ-γ' Co-Al-Mo-Nb class cobalt-based superalloy and the alloying effect of Ti were studied by analyzing the phase stability, electronic structure and elastic properties, using first-principles study. It is found that the addition of Nb and Ti decreases the formation enthalpy of the system and stabilizes Co3(Al, Mo) phase. For Co-Al-Mo-Nb alloys, Nb prefers to occupy Mo4 site, while for Co-Al-Mo-Nb-Ti alloys, Nb and Ti prefer Mo3 site. Moreover, the addition of Nb and Ti in Co3(Al, Mo) declines the resistance to monoclinic shear in (100) plane and the hardness but improves the ductility which even exceeds that of Ni3Al. As this new alloy solves the problems of high density and low ductility of Co3(Al, W), it makes Co-based superalloy possess a better prospect.

Original languageEnglish
Article number124714
Journaljournal of the physical society of japan
Volume89
Issue number12
DOIs
Publication statusPublished - 2020 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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