Strong and light metal matrix composites with metallic glass particulate reinforcement

A new Al 6061 alloy composite reinforced with [(Fe1/2Co1/2)75B20Si5]96Nb4 metallic glass was produced by sintering at a temperature between the glass transition (Tg) and crystallization temperature (Tx) of the metallic glass and close to the melting temperature of the Al alloy. At this temperature range (ΔTx = Tx − Tg), the metallic glass particles exhibit viscous behavior, resulting in composites with low or zero porosity. The use of the glassy particles as reinforcement led to significant strengthening of the Al matrix alloy while retaining a plastic strain before fracture of about 13% leading to a remarkable combination of high strength and plasticity. Because metallic glasses are much harder than Al matrix alloys, when strain is applied to the composite, plastic deformation occurs in the matrix while the glassy particles deform only elastically.