Characterization of an amorphous–crystalline Mg-based composite

An amorphous–crystalline Mg-based composite with the nominal composition of Mg65Cu20Zn5Y10 has been formed by casting. X-ray diffractometry, differential scanning calorimetry, backscatter electron imaging, and energy dispersive X-ray analysis were used to characterize the structure of the composite, which is linked to the hardness, modulus, and fracture toughness obtained by Vickers and nanoindentation. Comparisons of the structure–property relationships are also made to composite materials of a similar composition. The effects of the crystalline microstructure on localized deformation through shear banding are discussed and related to the hardness and toughness results.