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 | |
| State | Published - Jan 1 2020 |
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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
Cite this
Irradiation induced creep in nanocrystalline high entropy alloys. / Jawaharram, Gowtham Sriram; Barr, Christopher M.; Monterrosa, Anthony M.; Hattar, Khalid; Averback, Robert S.; Dillon, Shen J.
In: Acta Materialia, Vol. 182, 01.01.2020, p. 68-76.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Irradiation induced creep in nanocrystalline high entropy alloys
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
UR - http://www.scopus.com/inward/record.url?scp=85074254221&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85074254221&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2019.10.022
DO - 10.1016/j.actamat.2019.10.022
M3 - Article
AN - SCOPUS:85074254221
VL - 182
SP - 68
EP - 76
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
ER -