Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy

Chen, Shuying; Xie, Xie; Li, Weidong; Feng, Rui; Chen, Bilin; Qiao, Junwei; Ren, Yang; Zhang, Yong; Dahmen, Karin A.; Liaw, Peter K.

doi:10.1016/j.matchemphys.2017.09.004

Temperature effects on the serrated behavior of an Al_0.5CoCrCuFeNi high-entropy alloy

Journal Article · Tue Sep 05 00:00:00 EDT 2017 · Materials Chemistry and Physics

DOI:https://doi.org/10.1016/j.matchemphys.2017.09.004· OSTI ID:1471593

Chen, Shuying ^[1]; Xie, Xie ^[1]; Li, Weidong ^[1]; Feng, Rui ^[1]; Chen, Bilin ^[1]; Qiao, Junwei ^[2]; Ren, Yang ^[3]; Zhang, Yong ^[4]; Dahmen, Karin A. ^[5]; Liaw, Peter K. ^[1]

The Univ. of Tennessee, Knoxville, TN (United States)
Taiyuan Univ. of Technology (China)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Science and Technology Beijing (China)
Univ. of Illinois at Urbana Champaign, Urbana, IL (United States)

Compression experiments of the Al_0.5CoCrCuFeNi high-entropy alloy (HEA) under displacement control were conducted at different temperatures ranging from 673 K to 873 K with a low strain rate of 2 x 10^-4/s to study its serration behavior. Samples after compression tests were investigated, using the synchrontron-diffraction technique and transmission-electron microscopy. By comparing the stress-strain curves at different temperatures, two opposite directions of serrations were observed, named the upward serration appearing at 573 K and 673 K and the downward serration at 773 K and 873 K. The different directions of serrations were discussed in terms of not only the relationships among the stress vs. strain, stress vs. time, and strain vs. time, but also the interactions among dislocations, atoms, and nanoparticles. Lastly, the temperature effect on the flow serration is discussed by referring to a theoretical framework for the initiation of the serrated flow. Beyond a critical high temperature, the initiation of the serrated flow becomes swiftly difficult, and ultimately the plastic flow in the full deformation range turns smooth. Such a theoretical prediction of normal behavior is essentially in qualitative agreement with the experimental observation in the present work, i.e., the critical strain to intiate the serration decreases, with the increasing temperature.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); National Science Foundation of China; USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357; FE0008855; FE0011194; FE0024054

OSTI ID:: 1471593

Alternate ID(s):: OSTI ID: 1549802
OSTI ID: 22745788

Journal Information:: Materials Chemistry and Physics, Journal Name: Materials Chemistry and Physics Journal Issue: C Vol. 210; ISSN 0254-0584

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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