Irradiation induced creep in nanocrystalline high entropy alloys

Gowtham Sriram Jawaharram, Christopher M. Barr, Anthony M. Monterrosa, Khalid Hattar, Robert S. Averback, Shen J. Dillon

Research output: Contribution to journalArticle

Abstract

Irradiation induced creep (IIC) compliance in NiCoFeCrMn high entropy alloys is measured as a function of grain size (30 < x < 80 nm) and temperature (23–500 °C). For 2.6 MeV Ag3+ irradiation at a dose rate of 1.5×10 3 dpa 1s 1 the transition from the recombination to sink limited regimes occurs at ∼ 100 °C. In the sink-limited regime, the IIC compliance scales inversely with grain size, consistent with a recently proposed model for grain boundary IIC. The thermal creep rate is also measured; it does not become comparable to the IIC rate, however, until ∼ 650 °C. The results are discussed in context of defect kinetics in irradiated HEA systems.

Original languageEnglish (US)
Pages (from-to)68-76
Number of pages9
JournalActa Materialia
Volume182
DOIs
StatePublished - Jan 1 2020

Keywords

  • High entropy alloy (HEA)
  • In situ transmission electron microscopy
  • Irradiation induced creep
  • Vacancy migration enthalpy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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