Effects of Temperature on Serrated Flows of Al0.5CoCrCuFeNi High-Entropy Alloy

Shuying Chen, Xie Xie, Bilin Chen, Junwei Qiao, Yong Zhang, Yang Ren, Karin A. Dahmen, Peter K. Liaw

Research output: Contribution to journalArticlepeer-review

Abstract

Compression behavior of the Al0.5CoCrCuFeNi high-entropy alloy (HEA) was studied at different temperatures from 673 K to 873 K at a low strain rate of 5 × 10−5/s to investigate the temperature effect on the mechanical properties and serration behavior. The face-centered-cubic (fcc) structure is confirmed at the lower temperature of 673 K and 773 K, and a structure of mixed fcc and body-centered cubic (bcc) is identified at a higher temperature of 873 K after compression tests using high-energy synchrotron x-ray diffraction. By comparing the stress–strain curves at different temperatures, two opposite directions of serrations types were found, named upward serrations appearing at 673 K and 773 K and downward serrations at 873 K, which may be due to dynamic strain aging.

Original languageEnglish (US)
Pages (from-to)2314-2320
Number of pages7
JournalJOM
Volume67
Issue number10
DOIs
StatePublished - Oct 23 2015

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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