Integrative Materials Design of Three-Phase Mo-Si-B Alloys

Brindley, K. A.; Priddy, M. W.; Neu, R. W.

doi:10.1007/s40192-019-0124-4

Title: Integrative Materials Design of Three-Phase Mo-Si-B Alloys

Journal Article · 12 February 2019 · Integrating Materials and Manufacturing Innovation

DOI: https://doi.org/10.1007/s40192-019-0124-4 · OSTI ID:1511230

^[1]; Priddy, M. W. ^[2]; Neu, R. W. ^[3]

Georgia Inst. of Technology, Atlanta, GA (United States). The George W. Woodruff School of Mechanical Engineering
Mississippi State Univ., Mississippi State, MS (United States). Dept. of Mechanical Engineering
Georgia Inst. of Technology, Atlanta, GA (United States). The George W. Woodruff School of Mechanical Engineering. School of Materials Science and Engineering

Mo-Si-B alloys can offer higher temperature capability than Ni-base superalloys with proper balancing of the creep, ductility, and oxidation resistance through microstructure optimization. Mo-Si-B alloys are heterogeneous, containing both brittle and ductile phases and interfaces. Therefore, the phase fractions, their distributions, and their constitutive properties over the range of room temperature to maximum use temperature must be considered. This work addresses here the optimization of mechanical properties for three-phase Mo-Si-B alloys. Three modeling tools are employed: microstructure generators to re-create statistically realistic microstructures, crystal viscoplasticity constitutive equations implemented for use with finite element solvers to capture microplasticity, and reduced-order models for evaluating important mechanical properties. In particular, the effects of microstructure on elastic modulus, yield strength, fatigue resistance, and susceptibility to brittle microcracking are considered. A novel reduced-order model is introduced for the evaluation of susceptibility to microcracking at phase interfaces. It is found that the Si content of the α-Mo phase is much more significant to the alloy’s balance of mechanical properties than the α-Mo volume fraction.

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Research Organization:: Georgia Inst. of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1511230

Report Number(s):: LA-UR--18-21285

Journal Information:: Integrating Materials and Manufacturing Innovation, Journal Name: Integrating Materials and Manufacturing Innovation Journal Issue: 1 Vol. 8; ISSN 2193-9764

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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