Core shift controls grain boundary energy scaling in Cu and Al
Citation:
Zhang, X. and Boland, J.J., Core shift controls grain boundary energy scaling in Cu and Al, Acta Materialia, 265, 119606, 2024Download Item:
Abstract:
Grain boundary energies in different elements are correlated. The proportional scaling constants relating the
energies of crystallography-equivalent boundaries in any two f.c.c. elements are nearly constant, with the notable
exception of aluminum where these constants are known to vary significantly. However, the origins of the
exceptional behavior of aluminum are not understood. Previously, we reported that for fcc metals there is a
preference for tilt boundaries to shift their tilt axis across the (110) plane towards [112] and to ultimately form
low energy [112] core shifted boundaries (CSBs). By comparing grain boundary energies in copper and
aluminum with different tilt axes in (110) plane, we now report the existence of a well-defined scaling behavior
for the case of low angle boundaries. In contrast, the scaling constant for high angle boundaries is essentially
fixed regardless of their tilt axis shift. This results in a gradual change in the scaling constants from low angle to
high angle boundaries, which is responsible for the apparent exceptional scaling behavior found in aluminum. An
analysis of structure evolution during core shifting points to the significance of boundary-core dissociation, a
form of correlated relaxation of individual atoms at boundaries, in controlling the scaling of boundary energies.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
16/IA/4462
Science Foundation Ireland (SFI)
12/RC/2278_P2
Author's Homepage:
http://people.tcd.ie/jboland
Author: Boland, John
Type of material:
Journal ArticleCollections
Series/Report no:
Acta Materialia265
119606
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Full text availableDOI:
http://dx.doi.org/10.1016/j.actamat.2023.119606Metadata
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