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

doi:10.1016/j.actamat.2019.10.022

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 journal › Article

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 language	English (US)
Pages (from-to)	68-76
Number of pages	9
Journal	Acta Materialia
Volume	182
DOIs	https://doi.org/10.1016/j.actamat.2019.10.022
State	Published - 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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Jawaharram, G. S., Barr, C. M., Monterrosa, A. M., Hattar, K., Averback, R. S., & Dillon, S. J. (2020). Irradiation induced creep in nanocrystalline high entropy alloys. Acta Materialia, 182, 68-76. https://doi.org/10.1016/j.actamat.2019.10.022

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title = "Irradiation induced creep in nanocrystalline high entropy alloys",

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.",

keywords = "High entropy alloy (HEA), In situ transmission electron microscopy, Irradiation induced creep, Vacancy migration enthalpy",

author = "Jawaharram, {Gowtham Sriram} and Barr, {Christopher M.} and Monterrosa, {Anthony M.} and Khalid Hattar and Averback, {Robert S.} and Dillon, {Shen J.}",

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AU - Jawaharram, Gowtham Sriram

AU - Barr, Christopher M.

AU - Monterrosa, Anthony M.

AU - Hattar, Khalid

AU - Averback, Robert S.

AU - Dillon, Shen J.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - 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.

AB - 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.

KW - High entropy alloy (HEA)

KW - In situ transmission electron microscopy

KW - Irradiation induced creep

KW - Vacancy migration enthalpy

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