Randomized trial shows improved corrosion resistance and mechanical properties in Ti-alloyed Fe-Ni-Cr-Al alloys, suggesting benefits for structural applications.
The influence of Ti on the microstructure, corrosion resistance, and high-temperature mechanical properties of a FeNiCrAl-based multi-principal element alloy (MPEA) exposed to oxygen-depleted lead-bismuth eutectic (LBE) at 550°C was investigated. Results reveal that Ti alloying triggers the B2-to-L2 1 phase transformation and accelerates the precipitation of lamellar L1 2 phases within the matrix. In LBE environment, Ti alloying generates a dense, multi-layered oxide film (outer-to-inner sequence: FeCr 2 O 4 , Cr 2 O 3 , TiO 2 , Al 2 O 3 ), which effectively impedes LBE/matrix interdiffusion, preventing LBE corrosion in the Ti4 MPEA and reducing the oxide film thickness from 13.3 μm to 5.89 μm. Meanwhile, the alloy mitigates liquid metal embrittlement in the MPEA by enhancing protective oxidation and suppressing interphase cracking, thereby increasing its elongation to 9.5% from 5% in LBE at 550°C. This work establishes novel design ideas for MPEAs optimization in lead-cooled fast reactor structural applications.
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Xing et al. (2026) studied this question.
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