Abstract
Glass forming ability (GFA) and thermal stability of (Ni51W31.6B17.4)100-xCox (x = 0–35) alloy system have been investigated. It is found that as the cobalt content is increased critical casting thicknesses improve significantly. Critical casting thickness of 20, 25 and 30 at. % cobalt alloys are determined as 0.5, 1, and 1 mm, respectively. However, further increase of cobalt content degrades the GFA. The Ni-based bulk metallic glasses discovered in this study are the first ones ever developed which contain more than 10 at. % boron. It is also determined that after annealing the fully amorphous samples above their first and second crystallization temperatures, nickel solid solution and CoWB phase precipitate. This is the first study where precipitation of ultra-hard CoWB phase in a bulk metallic glass is reported.
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