Kinetic threshold for suppression in ion-irradiated Fe-Cr-Al alloys revealed by high-throughput mapping

Abe, Yosuke ; Kubo, Atsushi; Geng, D.*; Yamashita, Shinichiro ; Okubo, Nariaki ; Tsuru, Tomohito ; Sasaki, Taisuke*; Yu, H.*; Kasada, Ryuta*; Ukai, Shigeharu

We present a high-throughput framework for mapping composition-dependent irradiation hardening in Fe-Cr-Al alloys using diffusion-bonded combinatorial samples (0-45~at.% Cr, 0-25~at.% Al). LOESS interpolation with LOOCV optimization and automated Nix-Gao analysis enables reliable extraction of hardness from 100 nanoindentations in 15~s, with compositional uncertainty below 3~at.%. Under 10.5~MeV Fe $^{3+}$ irradiation to 9.1~dpa at 350 $^{circ}$ C, hardening is separated into contributions from defect clusters and Cr-rich $alpha^{prime}$ precipitation. Aluminum has a non-monotonic effect on $alpha^{prime}$ : it promotes precipitation near 5~at.% but suppresses it at higher levels, with suppression beginning at 5~at.-far below the 12~at.% equilibrium threshold-implying irradiation-driven kinetic effects.

Language	:	English
Journal	:	Nuclear Instruments and Methods in Physics Research B
Volume	:	576
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Pages	:	p.166135_1 - 166135_9
Publication Year/Month	:	2026/07
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Paper URL	:	https://doi.org/10.1016/j.nimb.2026.166135
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Registration No. : AA20260340
JAEA Abstracts No. : 54001007
Paper Submission No. : 31501

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