Abstract
Melt rheology in injection molded metastable supercooled liquid metal of Zr44-Ti11-Cu10-Ni10-Be25 alloy may induce selective crystallizations. High mobility Be, Cu and Ni atoms have been observed to differently crystallize in bulk metal glassy supercooled liquids. Here, we analyze the result of morphological microscopic observation conduct on Bulk Metallic Glass (BMG) with composition of a commercial liquid metal alloy (LM001B). The injection molded plate has been supplied by "Liquid Metals Technologies Inc, Ca USA" and manufactured using an Engel injection molding machine operating at 1050-1100°C; the observed sample then has been cut by water jet. FEI Scios Dual-Beam has carried out the microscopic observation. Particularly, through a cross section, we observe the presence of crystalline phases on the short-range order. We investigate the presence of short-range order clusters, their distribution and the effect that they could cause on the alloys' behaviors and properties.
Highlights
Bulk Metallic Glasses (BMGs), even called bulk amorphous alloys, are a category of advanced materials with a disordered atomic-scale structure
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)
The advantage of BMGs is the netshape 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
Summary
Bulk Metallic Glasses (BMGs), even called bulk amorphous alloys, are a category of advanced materials with a disordered atomic-scale structure. The microstructure of BMGs, 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).
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