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Irradiation induced creep in nanocrystalline high entropy alloys

Journal Article · · Acta Materialia
 [1];  [2];  [2];  [2];  [1];  [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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 1.5×103 dpa1s1 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. Here, the results are discussed in context of defect kinetics in irradiated HEA systems.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC04-94AL85000; NA0003525; SC0019875; FG02-05ER46217
OSTI ID:
1650165
Alternate ID(s):
OSTI ID: 1607542
OSTI ID: 1774580
Report Number(s):
SAND--2020-8400J; 689923
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 182; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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