Glass Forming Ability and Mechanical Properties of Misch Metal-Based Bulk Metallic Glass Matrix Composite

The effect of replacement of lanthanide by misch metal (Mm) in La-Al-TM (TM; transition metal, Ni, Cu and Co) alloys has been investigated to evaluate the possibility of fabrication of in-situ glass matrix composites withenhanced properties. For the as-cast cylindrical Mm 5 5 Al 2 5 Ni 1 0 Cu 1 0 alloy ingot with 3 mm diameter, the microstructure is consisted of two kinds of a few μm size crystalline phases (volume fraction: 4.6%) uniformly distributed in the metallic glass matrix. The substitution of La by Mm reduces the glass forming ability (GFA), i.e., lower the reduced glass transition temperature, Trg (= T g /T L , where T L is the liquidus temperature) and smaller superliquid temperature region, ΔT x (= T x - T g , where, Tg is the glass transition temperature and T x the onset temperatures of crystallization), enabling the fabrication of in-situ BMG matrix composite. The Mm 5 5 Al 2 5 Ni 1 0 Cu 1 0 metallic glass matrix composite sample exhibits the compressive fracture strength of 931 MPa, and in particular enhanced the compressive plastic strain of 1.2% before failure. The enhanced strength and ductility was explained by the presence of fine crystalline phases embedded in the BMG matrix, which led to a multiple shear band formation.

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