Microstructure and mechanical property of Nb-rich phase reinforced amorphous alloy matrix composites via dealloying reaction in metallic melt
The Nb-rich phase reinforced Zr-based amorphous alloy matrix composites were successfully fabricated via both conventional arc-melting and dealloying in metallic melt approaches.The microstructure and mechanical property of these samples fabricated by different methods were symmetrically compared.The results show that Nb-rich phase reinforced amorphous alloy matrix composite structure without any unexpected precipitations can be obtained by both methods,and the thermal property of these samples are similar.However,the Nb-rich phase in the samples fabricated by dealloying reactions is much finer than those by arc-melting,and the subsequent mechanical property is improved for the former samples.The Nb-rich phase can effectively hinder the rapid propagation of shear bands during the deformation,causing the multiplication of it to generate multiple shear bands.Meanwhile,the plastic deformation of Nb-rich phase itself can further decrease the degree of stress concentration at the interface to improve the plasticity of the composites.
amorphous alloy matrix compositedealloying reaction in metallic meltmicrostructurestrengthening and toughening
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