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Dose rate dependence of Cr precipitation in an ion-irradiated Fe-18Cr alloy

Journal Article · · Scripta Materialia
 [1];  [2];  [2];  [3];  [2];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
We report precipitation of α' in F - Cr alloys under neutron irradiation is thermodynamically driven while being accelerated by radiation-enhanced diffusion. However, similar alloys under ion irradiation at high dose rates (> 10-4 dpa/s) fail to exhibit α' precipitation. Here, the microstructure of an Fe - 18Cr alloy under ion or neutron-irradiation at 300 °C at dose rates from ~ 10-7 to 10-4 dpa/s was analyzed by atom probe tomography. The steady-state composition content of the clusters depends on the ion irradiation dose and dose rate, confirming the contribution of ballistic mixing in diluting the Cr concentration in non-equilibrium α' precipitates.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC52-07NA27344; FG03-94ER54275; NE0000639
OSTI ID:
1860815
Alternate ID(s):
OSTI ID: 22808567
Report Number(s):
LLNL-JRNL-832476; 1050231
Journal Information:
Scripta Materialia, Journal Name: Scripta Materialia Vol. 16; ISSN 1359-6462
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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