Segregation to and structure of [001] twist grain boundaries in Cu-Ni alloys

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90123-A· OSTI ID:6052761

Wang, H Y; Najafabadi, R; Srolovitz, D J ^[1]; Lesar, R ^[2]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
2. Los Alamos National Lab., NM (United States). Theoretical Div.

The segregation, thermodynamic, and structural properties of [001] twist boundaries in Cu-Ni alloys have been examined within a wide range of misorientations and temperatures. Cu always segregates to the boundary. The concentration of the first layer adjacent to the boundary increases monotonically with misorientation and no obvious cusps are observed. All other thermodynamic properties vary smoothly with the misorientation, with the exception of the vibrational entropy of the boundaries without segregation. The unsegregated vibrational entropy shows a large peak at the misorientation corresponding to the [Sigma]17 boundary and two minima around the [Sigma]13 and [Sigma]5 boundary orientations. The concentration distribution within the plane of the grain boundaries can be described by the same structural unit model established for [001] twist boundaries in pure materials. Regions of large tensile stress show greater segregation than do regions of compressive stress. Regions of large shear stress tend to show reduced segregation compared with regions of small shear stress.

• OSTI ID: 6052761
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:9; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
COPPER ALLOYS
DATA
ENERGY
FREE ENERGY
GRAIN BOUNDARIES
GRAIN ORIENTATION
INFORMATION
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
ORIENTATION
PHYSICAL PROPERTIES
SEGREGATION
STRESSES
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THEORETICAL DATA
THERMODYNAMIC PROPERTIES