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

Youxing Chen, Eric Hintsala, Nan Li, Bernard R. Becker, Justin Y. Cheng, Bartosz Nowakowski, Jordan Weaver, Douglas Stauffer, Nathan A. Mara

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3368-3377
Number of pages10
JournalJOM
Volume71
Issue number10
DOIs
StatePublished - Oct 1 2019

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