Composition dependence of the microstructure and mechanical behavior of Ti–Zr–Cu–Pd–Sn–Nb bulk metallic glass composites. (November 2017)

• Record Type: Journal Article
• Authors: Yang, S.; Li, D.; Li, X.C.; Zhang, Z.Z.; Zhang, S.F.; He, L.
• Is Part Of: Intermetallics. Volume 90(2017)
• Page Start: 1
• Page End: 8
• Publication Date: 2017-11
• Subjects: A. Metallic glasses -- B. Brittleness and ductility -- Mechanical properties -- Plastic deformation mechanisms -- D. Microstructure; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2017.06.006
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: Ti-based bulk metallic glass composite alloys Ti56 Zr6 Cu19.8 Pd8.4 Sn1.8 Nb8, Ti64 Zr4 Cu13.2 Pd5.6 Sn1.2 Nb12 and Ti68 Cu13.2 Pd5.6 Sn1.2 Nb12 were designed to obtain the microstructure composing of β-Ti dendrites and glassy matrix. The compressive and three-point bending properties were investigated. It was found that the actual microstructure of the Nb-added alloys consisted of primarily precipitated β-Ti dendrites, network-like glassy matrix, and extra island-like Ti2 Cu intermetallic phase with different volume fractions. Under compressive loading, all the Nb-added alloys presented higher yield strength combined with remarkably increased plasticity. Under bending condition, however, the alloys Ti56 Zr6 Cu19.8 Pd8.4 Sn1.8 Nb8 and Ti64 Zr4 Cu13.2 Pd5.6 Sn1.2 Nb12 with higher Ti2 Cu volume fractions became completely brittle. The alloy Ti68 Cu13.2 Pd5.6 Sn1.2 Nb12 could keep its plastic deformability due to the decreased Ti2 Cu volume fraction. Compressive deforming behavior of the Nb-added alloys was determined by the ductile β-Ti phase and glassy matrix, nevertheless, bending deforming behavior of the alloys was determined by the volume fraction and distribution of the brittle intermetallics. Graphical abstract: Highlights: Ti–Zr–Cu–Pd–Sn–Nb bulk metallic glass composites were prepared. The composites consisted of dendritic β-Ti, glassy matrix and Ti2 Cu phase. All the composites presented excellent compressive plasticity. Only the composite containing 8% Ti2 Cu exhibited enhanced bending plasticity.