Title

Ag2Al plates in Al-Ag alloys

Authors

Authors

S. Senapati; B. Kabes;H. Heinrich

Comments

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Abbreviated Journal Title

Z. Metallk.

Keywords

Al-Ag alloys; precipitates; scanning transmission electron microscopy; atomic number contrast; GUINIER-PRESTON ZONES; THERMODYNAMIC PROPERTIES; DIFFUSE-SCATTERING; INTERNAL STRUCTURE; AT.PERCENT AG; GAMMA-PLATES; GP-ZONES; SILVER; GROWTH; STEM; Metallurgy & Metallurgical Engineering

Abstract

The late stages of precipitation in aluminum-rich Al-Ag alloys with silver contents from 3 at.% to 22 at.% were studied with transmission electron microscopy. Shapes, sizes, and arrangements of plates of the stable hexagonal Ag2Al phase forming on {111} planes of the f.c.c. matrix were analysed. The high-angle annular dark-field contrast in scanning transmission electron microscopy is calibrated. This calibration allows for the quantitative measurement of plate thicknesses from high-angle annular dark-field scanning transmission electron micrographs of Ag2Al plates inclined to the electron beam. Results from these measurements are in good agreement with direct bright-field micrographs of plates viewed edge-on. For samples with silver contents above 12 at.% a parallel lamellar arrangement of fine gamma-plates and Al-rich matrix is found after extended heat treatments.

Journal Title

Zeitschrift Fur Metallkunde

Volume

97

Issue/Number

3

Publication Date

1-1-2006

Document Type

Article

Language

English

First Page

325

Last Page

328

WOS Identifier

WOS:000236671700019

ISSN

0044-3093

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