Influence of Interface Proximity on Precipitation Thermodynamics

Metals

Marc Weikamp¹  Kai Wang¹  Ruth Schwaiger¹  Robert Spatschek¹  Ulrich Prahl²  Carina Zimmermann³  Martin Hunkel³  Mingxuan Lin⁴ 

[1] Institut für Energie- und Klimaforschung IEK-2, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany;Institut für Metallformung, Technische Universität Bergakademie Freiberg, 09599 Freiberg, Germany;Leibniz-Institut für Werkstofforientierte Technologien—IWT, 28359 Bremen, Germany;Steel Institute, RWTH Aachen University, 52062 Aachen, Germany;

关键词: precipitation;    interfaces;    grain boundaries;    bainite;   

DOI  :  10.3390/met10101292

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown