Journal Article

FZJ-2020-03228

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of interface proximity on precipitation thermodynamics

Wang, K.FZJ* ; Weikamp, M. ; Lin, M. ; Zimmermann, C. ; Schwaiger, R.FZJ* ; Prahl, U. ; Hunkel, M. ; Spatschek, R. (Corresponding author)FZJ*

2020
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/25795  doi:10.3390/met10101292

Abstract: 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.

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)
2. JARA-ENERGY (JARA-ENERGY)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)

Appears in the scientific report 2020

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