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

SCRIPTA MATERIALIA

卷:146

Article

Reese, Elaina R.¹  Almirall, Nathan²  Yamamoto, Takuya²  Tumey, Scott³  Odette, G. Robert²  Marquis, Emmanuelle A.¹ 

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

关键词: Fe-Cr;    Ion irradiation;    Precipitation;    Dose rate;    Atom probe tomography;   

DOI  :  10.1016/j.scriptamat.2017.11.040

来源: Elsevier

【 摘 要 】

Precipitation of alpha' in Fe 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 alpha' precipitation. Here, the microstructure of an Fe-18Cr alloy under ion or neutron-irradiation at 300 degrees C at dose rates from similar to 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 alpha' precipitates. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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