Negentropic stabilization of metastable β-Ti in bulk metallic glass composites

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....

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Bibliographic Details
Published in:Scripta materialia 2016-12, Vol.125, p.19-23
Main Authors: Zhang, L., Zhang, H.F., Li, W.Q., Gemming, T., Zhu, Z.W., Fu, H.M., Eckert, J., Pauly, S.
Format: Article
Language:English
Subjects:
Amorphous materials
Interfaces
Liquids
Metallic glass composite
Metallic glasses
Phase transformations
Precipitates
Precipitation
Solidification
Stabilization
Titanium alloys
Transformations
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Summary: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. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.07.031