Faceting of {sigma}3 and {sigma}9 grain boundaries in Cu-Bi alloys

Journal Article · Mon Jan 10 00:00:00 EST 2005 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2004.08.015· OSTI ID:20637115

Straumal, B B ^[1]; Polyakov, S A ^[1]; Bischoff, E ^[2]; Gust, W ^[2]; Baretzky, B ^[2]

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1. Laboratory of Interfaces in Metals, Institute of Solid State Physics, Institutskii prospect 15, 142432 Chernogolovka, Moscow District (Russian Federation)
2. Max-Planck-Institut fuer Metallforschung and Institut fuer Metallkunde, Heisenbergstr. 3, 70569 Stuttgart (Germany)

The faceting of {sigma}3 and {sigma}9 tilt grain boundaries (GBs) has been studied in bicrystals of pure Cu and Cu-Bi alloys containing 2.5 x 10{sup -3}, 10 x 10{sup -3} and 16 x 10{sup -3} at.% Bi. The {sigma}3(1 0 0), {sigma}9(1 0 0), {sigma}9(-1 1 0), and {sigma}9(-1 2 0) facets and non-CSL {sigma}3 82 deg 9R facet were observed, where {sigma} is the inverse density of coincidence sites. The ratio between GB energy, {sigma}{sub GB}, and surface energy, {sigma}{sub sur}, was measured by atomic force microscopy using the GB thermal-groove method. The GB energy and thermal-groove deepening rate increased slightly between 0 and 10 x 10{sup -3} at.% Bi for all facets studied. However, between 10 x 10{sup -3} and 16 x 10{sup -3} at.% Bi the GB energy increased dramatically [from a factor 2 for the {sigma}9(1 1 0) facet to 15 times larger for the {sigma}3(1 0 0) facet]. The thermal-groove deepening rate also increased by a factor of 10 in this concentration range. This change corresponds well with the GB solidus line (i.e., the formation of a stable layer of a liquid-like GB phase called GB prewetting) observed previously. Wulff diagrams were constructed using measured {sigma}{sub GB}/{sigma}{sub sur} values.

• OSTI ID: 20637115
• Journal Information: Acta Materialia, Vol. 53, Issue 2; Other Information: DOI: 10.1016/j.actamat.2004.08.015; PII: S1359-6454(04)00493-8; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC FORCE MICROSCOPY
BICRYSTALS
BISMUTH ALLOYS
COPPER
COPPER ALLOYS
GRAIN BOUNDARIES
LAYERS
PHASE DIAGRAMS
SURFACE ENERGY