Interplay between diffusive and displacive phase transformations: time-temperature-transformation diagrams and microstructures

Materials which can undergo extremely fast displacive transformations as well as very slow diffusive transformations are studied using a Ginzburg-Landau framework. This simple model captures the essential physics behind microstructure formation and time-temperature-transformation diagrams in alloys...

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Bibliographic Details
Published in:Physical review letters 2006-08, Vol.97 (5), p.055701-055701, Article 055701
Main Authors: Bouville, Mathieu, Ahluwalia, Rajeev
Format: Article
Language:English
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Summary:Materials which can undergo extremely fast displacive transformations as well as very slow diffusive transformations are studied using a Ginzburg-Landau framework. This simple model captures the essential physics behind microstructure formation and time-temperature-transformation diagrams in alloys such as steels. It also predicts the formation of mixed microstructures by an interplay between diffusive and displacive mechanisms. The intrinsic volume changes associated with the transformations stabilize mixed microstructures such as martensite-retained austenite (responsible for the existence of a martensite finish temperature) and martensite-pearlite.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.97.055701