A novel nano-structured zirconium alloy prospective for high temperature applications
Journal of Alloys and Compounds(2024)
Abstract
Zirconium alloys have many advantages for structural applications in nuclear reactors, but their use has been generally restricted at temperatures below 400°C. In this study, a novel nano-structured Zr alloy was successfully fabricated by ball milling and hot-isostatic-pressing, using Zr, Sn, ZrH2 and nano-Y2O3 as raw powders. The alloy microstructure was characterized to be uniquely featured with a very fine grain structure (mean size: ∼3 μm) and a high number density of highly-coherent, ultra-fine nano-precipitates (mean size: 4.2nm, density: ∼2.52×1023m−3). These nano-precipitates were identified as Y2Zr2O7, with the interfacial orientation relation of 001(010)Y2Zr2O7//000121̅1̅0Zr. This new alloy achieved remarkably-improved strength and heat resistance from room temperature up to 600°C for at least 1000h, which is superior to all the current commercial Zr alloys, especially to Zr-2 and Zr-4 alloys with a more comparable matrix composition.
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Key words
Zirconium alloy,nano-structured,Y2Zr2O7,oxide dispersion strengthening, high temperature
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