Crystallographic Analysis of Nucleation at Hardness Indentations in High-Purity Aluminum

• Nucleation at Vickers hardness indentations has been studied in high-purity aluminum cold-rolled 12 pct. Electron channeling contrast was used to measure the size of the indentations and to detect nuclei, while electron backscattering diffraction was used to determine crystallographic orientations. It is found that indentations are preferential nucleation sites. The crystallographic orientations of the deformed grains affect the hardness and the nucleation potentials at the indentations. Higher hardness gives increased nucleation probabilities. Orientation relationships between nuclei developed at different indentations within one original grain are analyzed and it is found that the orientation distribution of the nuclei is far from random. It is suggested that it relates to the orientations present near the indentation tips which in turn depend on the orientation of the selected grain in which they form. Finally, possible nucleation mechanisms are briefly discussed. © 2016, The Minerals, Metals & Materials Society and ASM International.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

Aluminum

Backscattering

Cold rolling

Metal cladding

Nucleation

Vickers hardness

Crystallographic analysis

Crystallographic orientations

Electron backscattering diffraction

Electron channeling contrasts

Nucleation probabilities

Orientation distributions

Orientation relationship

Vickers hardness indentation

Indentation

Materials Science

Materialvetenskap

Materialteknik

Materials Engineering

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