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Title: High-throughput additive manufacturing and characterization of refractory high entropy alloys

Abstract

Refractory High Entropy Alloys (RHEAs) and Refractory Complex Concentrated Alloys (RCCAs) are high-temperature structural alloys ideally suited for use in harsh environments. While these alloys have shown promising structural properties at high temperatures that exceed the practical limits of conventional alloys, such as Ni-based superalloys, exploration of the complex phase-space of these materials remains a significant challenge. We report on a high-throughput alloy processing and characterization methodology, leveraging laser-based metal additive manufacturing (AM) and mechanical testing techniques, to enable rapid exploration of RHEAs/RCCAs. We utilized in situ alloying and compositional grading, unique to AM processing, to rapidly-produce RHEAs/RCCAs using readily available and inexpensive commercial elemental powders. We demonstrate this approach with the MoNbTaW alloy system, as a model material known for having exceptionally high strength at elevated temperature when processed using conventional methods (e.g., casting). Microstructure analysis, chemical composition, and strain rate dependent hardness of AM-processed material are presented and discussed in the context of understanding the structure-properties relationships of RHEAs/RCCAs.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Material, Physical, and Chemical Sciences Center
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1605719
Alternate Identifier(s):
OSTI ID: 1781159
Report Number(s):
SAND-2020-2842J
Journal ID: ISSN 2352-9407; 684575
Grant/Contract Number:  
AC04-94AL85000; NA-0003525
Resource Type:
Accepted Manuscript
Journal Name:
Applied Materials Today
Additional Journal Information:
Journal Volume: 19; Journal Issue: C; Journal ID: ISSN 2352-9407
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Additive manufacturing; Refractory high entropy alloys; Strain rate sensitivity; In situ alloying; High-throughput

Citation Formats

Melia, Michael Anthony, Whetten, Shaun R, Puckett, Raymond Vernon, Jones, Morgan, Heiden, Michael, Argibay, Nicolas, and Kustas, Andrew. High-throughput additive manufacturing and characterization of refractory high entropy alloys. United States: N. p., 2020. Web. https://doi.org/10.1016/j.apmt.2020.100560.
Melia, Michael Anthony, Whetten, Shaun R, Puckett, Raymond Vernon, Jones, Morgan, Heiden, Michael, Argibay, Nicolas, & Kustas, Andrew. High-throughput additive manufacturing and characterization of refractory high entropy alloys. United States. https://doi.org/10.1016/j.apmt.2020.100560
Melia, Michael Anthony, Whetten, Shaun R, Puckett, Raymond Vernon, Jones, Morgan, Heiden, Michael, Argibay, Nicolas, and Kustas, Andrew. Sat . "High-throughput additive manufacturing and characterization of refractory high entropy alloys". United States. https://doi.org/10.1016/j.apmt.2020.100560. https://www.osti.gov/servlets/purl/1605719.
@article{osti_1605719,
title = {High-throughput additive manufacturing and characterization of refractory high entropy alloys},
author = {Melia, Michael Anthony and Whetten, Shaun R and Puckett, Raymond Vernon and Jones, Morgan and Heiden, Michael and Argibay, Nicolas and Kustas, Andrew},
abstractNote = {Refractory High Entropy Alloys (RHEAs) and Refractory Complex Concentrated Alloys (RCCAs) are high-temperature structural alloys ideally suited for use in harsh environments. While these alloys have shown promising structural properties at high temperatures that exceed the practical limits of conventional alloys, such as Ni-based superalloys, exploration of the complex phase-space of these materials remains a significant challenge. We report on a high-throughput alloy processing and characterization methodology, leveraging laser-based metal additive manufacturing (AM) and mechanical testing techniques, to enable rapid exploration of RHEAs/RCCAs. We utilized in situ alloying and compositional grading, unique to AM processing, to rapidly-produce RHEAs/RCCAs using readily available and inexpensive commercial elemental powders. We demonstrate this approach with the MoNbTaW alloy system, as a model material known for having exceptionally high strength at elevated temperature when processed using conventional methods (e.g., casting). Microstructure analysis, chemical composition, and strain rate dependent hardness of AM-processed material are presented and discussed in the context of understanding the structure-properties relationships of RHEAs/RCCAs.},
doi = {10.1016/j.apmt.2020.100560},
journal = {Applied Materials Today},
number = C,
volume = 19,
place = {United States},
year = {2020},
month = {2}
}

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