Negentropic stabilization of metastable β-Ti in bulk metallic glass composites. (December 2016)

• Record Type: Journal Article
• Authors: Zhang, L.; Zhang, H.F.; Li, W.Q.; Gemming, T.; Zhu, Z.W.; Fu, H.M.; Eckert, J.; Pauly, S.
• Is Part Of: Scripta materialia. Volume 125(2016)
• Page Start: 19
• Page End: 23
• Publication Date: 2016-12
• Subjects: Metallic glass composite -- Phase transformations -- Interfaces -- Titanium alloys; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.07.031
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In order to obtain metastable β-type bulk metallic glass composites (BMGCs), understanding the thermodynamic stability of the β phase is crucial. The interface between β-Ti and the supercooled liquid in BMGCs is revealed to play an important role on stabilizing metastable β-Ti during solidification. Additional interfacial energy hampers the formation of α-Ti laths at the interface, and the critical cooling rate required to suppress the transformation from β-Ti to α-Ti in BMGCs is reduced. The result implies that metastable β-Ti in BMGCs is prone to precipitate ω-Ti rather than α-Ti, which is significant on understanding the microstructures of β-type BMGCs. Graphical abstract: