脱合金工艺对混杂增强非晶复合材料组织与性能的影响

The reinforced [(Zr_0.5Cu_0.5)_92.5Al₇Sn_0.5]_0.95Ta₅ amorphous alloy matrix composites with the core-shell hybrid structure (Ta-rich phase as core-phase, B2-CuZr as shell-phase) were prepared by dealloying reaction in metallic melt. The evolution law of the microstructure and mechanical property of the amorphous alloy matrix composites under different dealloying parameters was symmetrically investigated. The results show that dealloying temperature and time are key parameters that affected the size of Ta-rich phase. When the dealloying temperature is low or time is short, Ta-rich phase will aggregate together and distribute inhomogeneously. When the temperature is high or the time is long, Ta-rich phase will coarsen. When the dealloying time and temperature is 2 min and 1473 K, respectively, the obtained refined Ta-rich phase distributes homogeneously and contributes to the refinement of B2-CuZr. The refined and homogeneously distributes core-shell hybrid reinforcing structure can hinder the rapid propagation of main shear band to further improve the mechanical property, thus improving the mechanical property of the composites with fracture strength of 2439 MPa and plastic strain of 11.6%.