Portevin-Le Chatelier mechanism in face-centered-cubic metallic alloys from low to high entropy

Tsai, Che-Wei; Lee, Chi; Lin, Po-Ting; Xie, Xie; Chen, Shuying; Carroll, Robert; LeBlanc, Michael; Brinkman, Braden A.W.; Liaw, Peter K.; Dahmen, Karin A.; Yeh, Jien-Wei

doi:10.1016/j.ijplas.2019.07.003

Portevin-Le Chatelier mechanism in face-centered-cubic metallic alloys from low to high entropy

Journal Article · Sat Jul 06 00:00:00 EDT 2019 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2019.07.003· OSTI ID:1799738

Tsai, Che-Wei ^[1]; Lee, Chi ^[2]; Lin, Po-Ting ^[2]; Xie, Xie ^[3]; Chen, Shuying ^[3]; Carroll, Robert ^[4]; LeBlanc, Michael ^[4]; Brinkman, Braden A.W. ^[5]; Liaw, Peter K. ^[6]; Dahmen, Karin A. ^[4]; Yeh, Jien-Wei ^[2]

National Tsing Hua Univ., Hsinchu (Taiwan); OSTI
National Tsing Hua Univ., Hsinchu (Taiwan)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)
Univ. of Washington, Seattle, WA (United States)
National Tsing Hua Univ., Hsinchu (Taiwan); Univ. of Tennessee, Knoxville, TN (United States)

Serration phenomena during tensile testing on certain alloys with diffusing solute atoms (i.e., Portevin–Le Chatelier effect) have been observed for a long time, but detailed mechanisms are not fully clear yet. This study is intended to find the mechanism from different approaches verified by tensile testing on a series of single-phase face-centered-cubic (FCC) pure metal and alloys: Ni, CoNi, CoFeNi, CoCrFeNi, and CoCrFeMnNi, which range from low to high configurational entropy. The results of tensile tests, at strain rates from 1 × 10^-5 to 1 × 10^-2/s and temperature from room temperature to 700 °C, show that serrations occur on stress-strain curves of CoFeNi, CoCrFeNi, and CoCrFeMnNi alloys in their specific temperature and strain-rate regime. A mechanism for dislocation pinning is proposed and verified with theoretical calculation for the present substitutional alloys. The proposed mechanism involves the in-situ rearrangement of substitutional solute atoms by “local dislocation-core diffusion” and might also be applied to similar substitutional alloys.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0008855; FE0011194

OSTI ID:: 1799738

Alternate ID(s):: OSTI ID: 1693611

Journal Information:: International Journal of Plasticity, Journal Name: International Journal of Plasticity Vol. 122; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Portevin-Le Chatelier effect
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medium-entropy alloy
serration mechanism
substitutional alloy

Portevin-Le Chatelier mechanism in face-centered-cubic metallic alloys from low to high entropy

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