Influence of Interface Proximity on Precipitation Thermodynamics

The formation of coherent precipitates is often accompanied by large elastic mismatch stresses, which suppress phase separation. We discuss the presence of interfaces as a mechanism for stress relaxation, which can lead to preferred zones of precipitation. In particular, we discuss the proximity of...

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Bibliographic Details
Published inMetals (Basel ) Vol. 10; no. 10; p. 1292
Main Authors Wang, Kai, Weikamp, Marc, Lin, Mingxuan, Zimmermann, Carina, Schwaiger, Ruth, Prahl, Ulrich, Hunkel, Martin, Spatschek, Robert
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2020
Subjects
bainite
Bainitic transformations
Carbon
Energy
Free surfaces
Grain boundaries
Influence
Interfaces
Mechanical properties
Phase separation
Phase transitions
Precipitates
precipitation
Precipitation hardening
Solid solutions
Stress relaxation
Thermodynamics
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Summary:The formation of coherent precipitates is often accompanied by large elastic mismatch stresses, which suppress phase separation. We discuss the presence of interfaces as a mechanism for stress relaxation, which can lead to preferred zones of precipitation. In particular, we discuss the proximity of free surfaces and shear-coupled grain boundaries, for which we can obtain a substantial local energy reduction and predict the influence on the local precipitation thermodynamics. The latter case is accompanied by morphological changes of the grain boundary, which are less suitable for large-scale descriptions. For that purpose, we develop an effective description through an elastic softening inside the grain boundary and map the microscopic grain boundary relaxation to a mesoscopic elastic and phase field model, which also allows generalizing the description to multi-phase situations.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10101292