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High-Throughput Nanomechanical Screening of Phase-Specific and Temperature-Dependent Hardness in AlxFeCrNiMn High-Entropy Alloys

  • Youxing ChenEmail author
  • Eric HintsalaEmail author
  • Nan Li
  • Bernard R. Becker
  • Justin Y. Cheng
  • Bartosz Nowakowski
  • Jordan Weaver
  • Douglas Stauffer
  • Nathan A. Mara
New Developments in Nanomechanical Methods
  • 43 Downloads

Abstract

Development of structural materials for service under extreme conditions is slowed by the lack of high-throughput test protocols. Here, a method that integrates high-throughput nanoindentation mapping with precise temperature control under a vacuum atmosphere is demonstrated. High-entropy alloys (HEAs) may possess the strength and stability required of high-temperature structural materials in next-generation nuclear applications. These alloys, including the compositional variation AlxFeCrNiMn (x = 0, 0.3, 1) presented in this work, have distinct microstructural morphologies, and nanoindentation mapping reveals the mechanical behavior of the distinct phases as a function of temperature up to 400°C. FeCrNiMn (Al = 0) consists of a face-centered cubic (FCC) matrix with body-centered cubic (BCC) precipitates and exhibits significant softening in both phases at elevated temperature. In contrast, both the FCC phase and FCC–BCC phases present in Al0.3FeCrNiMn show approximately 90% retention of the room temperature hardness at 400°C, and AlFeCrNiMn with BCC and B2 structures shows a similar 85% retention of hardness.

Notes

Acknowledgements

NAM and Y. Chen gratefully acknowledge financial support from Bruker Nano Surfaces. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the US Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC, for the US Department of Energy’s NNSA, under Contract 89233218CNA000001.

Supplementary material

11837_2019_3714_MOESM1_ESM.pdf (86 kb)
Supplementary material 1 (PDF 85 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and Engineering ScienceUniversity of North CarolinaCharlotteUSA
  2. 2.Department of Chemical Engineering and Materials ScienceUniversity of MinnesotaMinneapolisUSA
  3. 3.Bruker Nano SurfacesEden PrairieUSA
  4. 4.MPA-CINT, Los Alamos National LaboratoryLos AlamosUSA
  5. 5.Engineering LaboratoryNational Institute of Standards and TechnologyGaithersburgUSA

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