Abstract
In this paper, Zr alloys are synthesized with nominal compositions: 50Zr-30Fe-10Cr-5Cu-5Ti (alloy A), and 49Zr-30Fe-10Cr-5Cu-5Ti-1Y2O3 (alloy B), 45Zr-30Fe-10Cr-10Cu-5Ti (alloy C), 44Zr-30Fe-10Cr-10Cu-5Ti-1Y2O3 (alloy D) (all in wt%) by mechanical alloying and consolidated by pulse plasma sintering at 1173K (900°C), 1223K (950°C) and 1273K (1000°C) using 75MPa uniaxial pressure applied for 5min and 70 kA pulsed current at 3Hz pulse frequency. The microstructure and phase evolution during mechanical alloying and sintering has been characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM & TEM) and energy dispersive spectroscopy (EDS). Mechanical properties i.e. hardness and compressive strength were determined by using nano-indentation unit and universal testing machine. The produced alloys recorded very high levels of compressive strength (1359–2456MPa), and hardness (7.05–10.05GPa) which measures 1.5–2.0 times more than that of other Zr alloys (<1000MPa) as available in the literature. Those impressive mechanical properties can be attributed to the microstructure of the developed alloys constituted by Zr matrix containing uniform dispersion of nanomertic (10–20nm) oxide (Y2O3) particles which can contribute to grain boundary pinning, and improved creep and oxidation resistance at elevated temperature.
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