原位自生富 Fe 相增强 Mg-Cu-Ag-Gd-Fe 非晶复合材料的制备及其力学性能

Based on the differences in enthalpy of mixing between elements, we had successfully introduced in-situ Fe-rich phase during solidification via microalloying with Fe into Mg-based amorphous alloys. The Fe-rich phase distributed in the Mg-based amorphous alloy matrix homogeneously with an average size of 8 μm and volume fraction of 14%. Compared to the brittle fracture of the base monolithic amorphous alloy, the in-situ Fe-rich phase reinforced Mg-based amorphous alloy matrix composites showed obvious yielding and plastic deformation. The plastic strain was as high as 9.5%, the fracture strength was also higher than the base alloy. By observing the fracture morphology, we found that the Fe-rich phase could effectively hinder the rapid propagation of main shear band in the matrix, causing the deflection and multiplication of it. The generated multiple shear bands contributed to the improved mechanical properties of the composites.