Abstract
To explore the application potential of bulk metallic glasses (BMGs) as energetic structural materials (ESMs) and address the limitations in the preparation of large-sized monolithic BMGs, the effect of the in-situ crystalline phases on the mechanical properties and energy release behaviors of Zr55Ni5Al10Cu30 BMGs are evaluated. The results indicate that while the content of in-situ crystalline phases in Zr55Ni5Al10Cu30 alloy are effectively tailored by controlling the cooling rate of molten alloys, the mechanical properties and energy release behaviors of Zr55Ni5Al10Cu30 are determined by the content of in-situ crystalline phases. The alloy prepared using the highest cooling rate possesses the lowest crystalline phase content as well as the highest strength and deformability. By contrast, the complete crystalline alloy prepared by annealing exhibits the highest energy release characteristics under high-speed impact owing to the highest degree of brittleness and most oxidation reaction. The Zr55Ni5Al10Cu30 alloy with different crystalline phase content shows potential as an ESM. Its mechanical properties and energetic characteristics can be effectively tailored by controlling the content of in-situ crystalline phases via cooling rate modulation.
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