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Effect of Nb and B on the Precipitation Behaviors in Al-Ti-Nb Balanced-Ratio Ni-Based Superalloy: A Phase-Field Study.

Authors :
Ta, Na
Zhou, Hongguang
Zhang, Cong
Zhang, Ruijie
Zhang, Lijun
Source :
Crystals (2073-4352); Jul2024, Vol. 14 Issue 7, p614, 18p
Publication Year :
2024

Abstract

In this paper, quantitative two-dimensional (2-D) phase-field simulations were performed to gain insight into the effects of B and Nb for Al-Ti-Nb balanced-ratio GH4742 alloys. The microstructure evolution during the precipitation process was simulated using the MICRESS (MICRostructure Evolution Simulation Software) package developed in the formalism of the multi-phase field model. The coupling to CALPHAD (CALculation of PHAse Diagram) thermodynamic databases was realized via the TQ interface. The morphological evolution, concentration distribution, and thermodynamic properties were extensively analyzed. It is indicated that a higher Nb content contributes to a faster precipitation rate and higher amounts and the smaller precipitate size of the γ′ phase, contributing to better mechanical properties. The segregation of the W element in γ′ precipitate due to its sluggish diffusion effect has also been observed. Higher temperatures and lower B contents accelerate the dissolution of boride and reduce the precipitation of borides. With the increased addition of B, the formation of borides may have a pinning effect on the grain boundary to hinder the kinetic process. In addition, borides are prone to precipitate around the interface rather than in the bulk phase. Once the M<subscript>3</subscript>B<subscript>2</subscript> borides nucleate, they grow in the consumption of γ′ phases. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20734352
Volume :
14
Issue :
7
Database :
Complementary Index
Journal :
Crystals (2073-4352)
Publication Type :
Academic Journal
Accession number :
178691141
Full Text :
https://doi.org/10.3390/cryst14070614