Strong and light metal matrix composites with metallic glass particulate reinforcement

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2012, Vol.532, p.325-330
• Main Authors: Aljerf, M., Georgarakis, K., Louzguine-Luzgin, D., Le Moulec, A., Inoue, A., Yavari, A.R.
• Format: Article
• Language: English
• Subjects: Aluminium alloys; Aluminum base alloys; Amorphous materials; Applied sciences; Bulk amorphous alloys; Chemical Sciences; Composites; Dispersion hardening metals; Exact sciences and technology; Fractures; Glassy; Hardening; Material chemistry; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metallic glasses; Metals. Metallurgy; Micromechanics; Particulate composites; Plastic deformation; Powder metallurgy. Composite materials; Production techniques; Reinforcement; Sintering; Strain
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2011.10.098

► A novel Al alloy composite reinforced with Fe-based metallic glass was developed. ► Full densification was achieved by eliminating porosity. ► The mechanical strength of the composite was significantly improved. ► Good combination of high strength and plasticity, attractive for applications. ► The glassy particles deform elastically upon plastic deformation of the composite. A new Al 6061 alloy composite reinforced with [(Fe 1/2Co 1/2) 75B 20Si 5] 96Nb 4 metallic glass was produced by sintering at a temperature between the glass transition ( T g ) and crystallization temperature ( T x ) of the metallic glass and close to the melting temperature of the Al alloy. At this temperature range (Δ T x = T x − T g ), 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.