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

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
JournalInternational journal of plasticity
DOIs
StateAccepted/In press - Jan 1 2019

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Entropy
Tensile testing
Strain rate
Atoms
Stress-strain curves
Temperature
Metals

Keywords

  • High-entropy alloy
  • Medium-entropy alloy
  • Portevin-Le Chatelier effect
  • Serration mechanism
  • Substitutional alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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.

In: International journal of plasticity, 01.01.2019.

Research output: Contribution to journalArticle

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. / Portevin-Le Chatelier mechanism in face-centered-cubic metallic alloys from low to high entropy. In: International journal of plasticity. 2019.
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AU - Tsai, Che Wei

AU - Lee, Chi

AU - Lin, Po Ting

AU - Xie, Xie

AU - Chen, Shuying

AU - Carroll, Robert

AU - LeBlanc, Michael

AU - Brinkman, Braden A.W.

AU - Liaw, Peter K.

AU - Dahmen, Karin A

AU - Yeh, Jien Wei

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N2 - 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.

AB - 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.

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