Room temperature ductile W-Y2O3 alloy with high thermal shock resistance
International Journal of Refractory Metals and Hard Materials(2023)
摘要
The microstructure and mechanical properties of tungsten (W) materials have strong influences on their thermal shock performance. In this work, a W-Y2O3 (0.14 wt% Y) alloy with bimodal grain structure was fabricated by swaging plus high energy rate forging of the hydrogen sintered compact. In tensile tests, the W alloy exhibits a high yield strength (σY = 1400 MPa) and a plastic strain ε = 5.5% at room temperature, and extensive tensile strains exceeding 20% at 100–300 °C. Its thermal shock performance was assessed by applying cyclic edge localized mode-like long heat pulse for 100 times at room temperature with an electron beam equipment. Within the range 0.44–1.1 GW m−2, the specimens are free of cracking, and the surface modifications change from shear step-like bulges to recrystallization with increasing absorption power density.
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关键词
Tungsten, Plasma facing materials, Microstructure, Mechanical property, Thermal shock resistance
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