Compressive plasticity of a La-based glass-crystal composite at cryogenic temperatures. (5th July 2016)

• Record Type: Journal Article
• Authors: Madge, S.V.; Louzguine-Luzgin, D.V.; Kawashima, A.; Greer, A.L.; Inoue, A.
• Is Part Of: Materials & design. Volume 101(2016)
• Page Start: 146
• Page End: 151
• Publication Date: 2016-07-05
• Subjects: Bulk metallic glass -- Composites -- Toughness -- Cryogenic plasticity; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2016.03.149
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The La55 Al25 Cu10 Ni10 –10 vol.% Ti glassy composites have excellent compressive strength and plasticity at room temperature (RT). At cryogenic temperature (77 K), neither the glassy matrix, nor the Ti particles undergo embrittlement, and the composite retains appreciable toughness. Surprisingly, despite significant shear band plasticity at 77 K, failure occurs in a mixed mode manner, with large areas showing quasi-cleavage features that appear to initiate from cracks at the glass-Ti interfaces, which also limit the overall plastic strain. Interface engineering is the key to further alloy development for even better properties. Graphical abstract: Highlights: A La-based glass shows enhanced toughness at 77 K. Glass reinforced with Ti retains plasticity at 77 K. No ductile-brittle transition seen in glass and Ti particles. Composite plasticity is limited only by interfacial failure. Unusual combination of large plasticity and quasi-cleavage fracture.