Room-temperature serrated-flow behavior in Fe-rich FeAl under vacancy supersaturation

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In Fe-rich FeAl, serrated plastic-flow behavior has been observed for the first time at room temperature. Serration on the tensile stress-strain curve occurs in single crystals that retained supersaturation of thermal vacancies after fast-cooling from the annealing temperature of 1173 K. In contrast to conventional serrated flow, the serrated flow in FeAl is associated with work hardening, and it becomes more pronounced with increasing Al content from 33 to 44 mol.%. The experimental results are interpreted in terms of the dynamic interaction of ({bar 1}01)[111] superdislocations with the excess thermal vacancies and their clusters, and the successive double cross-slip of ... continued below

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13 p.

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Yoshimi, K.; Yoo, M.H. & Hanada, S. November 1998.

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  • Yoshimi, K.
  • Yoo, M.H. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
  • Hanada, S. Tohoku Univ., Sendai (Japan). Inst. for Materials Research

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Description

In Fe-rich FeAl, serrated plastic-flow behavior has been observed for the first time at room temperature. Serration on the tensile stress-strain curve occurs in single crystals that retained supersaturation of thermal vacancies after fast-cooling from the annealing temperature of 1173 K. In contrast to conventional serrated flow, the serrated flow in FeAl is associated with work hardening, and it becomes more pronounced with increasing Al content from 33 to 44 mol.%. The experimental results are interpreted in terms of the dynamic interaction of ({bar 1}01)[111] superdislocations with the excess thermal vacancies and their clusters, and the successive double cross-slip of screw superdislocations at the moving front of a slip band. The strong dependence on alloy composition and the lack of strain-rate sensitivity are discussed.

Physical Description

13 p.

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OSTI as DE99000354

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  • 1998 Minerals, Metals and Materials Society (TMS) fall meeting, Rosemont, IL (United States), 11-15 Oct 1998

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  • Other: DE99000354
  • Report No.: ORNL/CP--98139
  • Report No.: CONF-981054--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/676874 | External Link
  • Office of Scientific & Technical Information Report Number: 676874
  • Archival Resource Key: ark:/67531/metadc712093

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Office of Scientific & Technical Information Technical Reports

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  • November 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 3, 2016, 6:59 p.m.

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Yoshimi, K.; Yoo, M.H. & Hanada, S. Room-temperature serrated-flow behavior in Fe-rich FeAl under vacancy supersaturation, report, November 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc712093/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.