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.
关键词
非晶复合材料/脱合金反应/微观组织/强韧性
Key words
amorphous alloy matrix composite/dealloying reaction in metallic melt/microstructure/strengthening and toughening
维普
万方数据