Bulk Metallic Glasses (BMGs), even called bulk amorphous alloys, are a category of advanced materials with a disordered atomic-scale structure. Their unique microstructure often imparts outstanding properties (Huang et al., 2016) to the manufacts.
Scientists and researchers in the last years have been studying Zr-based bulk materials for their superior Glass Forming Ability (GFA) and their mechanical properties. Their characteristics range from high mechanical strength, high fracture strength, superior elastic limit to good and precise deformability, good ductility, low coefficient of thermal expansion and excellent corrosion/wear resistance (Trachenko, 2008). USA company formation
BMGs multicomponent alloys based on Zr have superior Glass Forming Ability (GFA) and they can be produced into parts with thickness larger than a few centimeters by conventional melting and casting techniques (Liu et al., 2002).
Among the other, the advantage of BMGs is the net-shape as-cast form that provides reduced process cost and gives the possibility to manufacture several custom tools related to peculiar applications in a large range of industrial fields.
Sufficiently high critical cooling rates (>103°K/s) are necessary to manufacture these glasses from the molten alloys, a rapid solidification technique, in fact, may preserve the liquid amorphous microstructure (Huang et al., 2016; Petrescu et al., 2015; 2016; Jamaluddin et al., 2016, Bush, 2000).
The microstructure is the most important characteristic of BMGs compared to conventional metals; ordinary metals have a long-range order crystalline structure; a periodic lattice where patterns repeat themselves. The microstructure of BMGs, conversely, does not present long-range order, but a short range organization amorphous structure, which is peculiar of glass materials (ceramics, polymers and metal); (Aversa et al., 2015; 2016a; Petrescu et al., 2016).