Ag2Al plates in Al-Ag alloys

    Authors

    S. Senapati; B. Kabes;H. Heinrich

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    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

    Share

    COinS