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

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [3]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). The George W. Woodruff School of Mechanical Engineering
  2. Mississippi State Univ., Mississippi State, MS (United States). Dept. of Mechanical Engineering
  3. Georgia Inst. of Technology, Atlanta, GA (United States). The George W. Woodruff School of Mechanical Engineering. School of Materials Science and Engineering
Publication Date:
Research Org.:
Georgia Inst. of Technology, Atlanta, GA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1511230
Report Number(s):
LA-UR-18-21285
Journal ID: ISSN 2193-9764
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Integrating Materials and Manufacturing Innovation
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2193-9764
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Mo-Si-B alloys; molybdenum-silicide alloys; ICME; structure-property relationships

Citation Formats

Brindley, K. A., Priddy, M. W., and Neu, R. W. Integrative Materials Design of Three-Phase Mo-Si-B Alloys. United States: N. p., 2019. Web. doi:10.1007/s40192-019-0124-4.
Brindley, K. A., Priddy, M. W., & Neu, R. W. Integrative Materials Design of Three-Phase Mo-Si-B Alloys. United States. doi:10.1007/s40192-019-0124-4.
Brindley, K. A., Priddy, M. W., and Neu, R. W. Tue . "Integrative Materials Design of Three-Phase Mo-Si-B Alloys". United States. doi:10.1007/s40192-019-0124-4.
@article{osti_1511230,
title = {Integrative Materials Design of Three-Phase Mo-Si-B Alloys},
author = {Brindley, K. A. and Priddy, M. W. and Neu, R. W.},
abstractNote = {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.},
doi = {10.1007/s40192-019-0124-4},
journal = {Integrating Materials and Manufacturing Innovation},
number = 1,
volume = 8,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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This content will become publicly available on February 12, 2020
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