Formation of Cu-Zr-Al-Ta In-Situ Bulk Metallic Glass Composite

Bulk metallic glasses (BMGs) have high strength and large elastic strain limit, with a few plastic strains at room temperature. In order to improve the room temperature plasticity, bulk metallic glass composites (BMGCs) have been developed. In this study, Cu-Zr-Al bulk metallic glass was prepared by copper mold casting. With the addition of Ta element, in situ bulk metallic glass composite was fabricated. Microstructure of the materials was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The X-ray diffraction pattern of bulk metallic glass containing Ta showed a broad halo peak, characteristic of amorphous phase, and sharp diffraction peaks of B2 CuZr. Also, the distribution of B2 CuZr was observed in SEM images. The results of uniaxial compression test at room temperature showed high plastic strain of 8% for Cu47Zr47Al6 BMG sample and 5.5% for (Cu47Zr47Al6)99 Ta1 alloy .The considerable plastic strain is attributed to interaction of shear bands with B2 CuZr particles and formation of multiple shear bands

کلیدواژه ها:

Bulk metallic glass composite ، Plasticity ، Shear band ، Compression test