You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 5, Issue 5 (December 2016)

    Special Issue Paper

    Quantitative Characterization of Hypoeutectic Aluminum–Silicon–Copper As-Cast Alloy Microstructures

    (Received 16 March 2016; accepted 30 June 2016)

    Published Online: 22 December 2016

    CODEN: MPCACD

      Format Pages Price  
    PDF (2.0M) 13 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    There are only two kinds of qualitative methods for the estimation of aluminum alloy structures: (1) bar charts (degree of eutectic fineness, porosity content, etc.), and (2) atlases of microstructures, mainly for rejection (overheating, for example). In this paper, the development of quantitative methods for the characterization of hypoeutectic Al-Si-Cu as-cast alloy microstructures using panoramic image analysis is described. As-cast and solution-annealed Al-6Si-2Cu alloy microstructures were studied. Parameters for monitoring the quality of the structure of this alloy were proposed. New algorithms for automatic estimation of eutectic fineness and its volume fraction were developed. Correlations among different microstructural parameters were found and interpreted using thermodynamic simulation. The grade of porosity according to GOST 1583-93 versus pore volume fraction, calculated by ASTM E1245, was defined. Bar charts for estimation of the average length of eutectic silicon particles were proposed. The eutectic modification grade, according to the American Foundry Society chart for microstructure control of hypoeutectic alloys, versus both the length and the elongation of eutectic silicon particles was determined. The relationships between alloy hardness and tensile elongation versus the proposed microstructural parameters for Al-6Si-2Cu alloy were defined. These relationships describe various grades of hypoeutectic Al-Si-Cu alloys in both the as-cast and as-solution-annealed conditions.


    Author Information:

    Kazakov, A.
    Peter the Great Saint Petersburg Polytechnic Univ., St. Petersburg,

    Kur, A.
    Peter the Great Saint Petersburg Polytechnic Univ., St. Petersburg,

    Kazakova, E.
    Peter the Great Saint Petersburg Polytechnic Univ., St. Petersburg,

    Kiselev, D.
    Thixomet Ltd., St. Petersburg,


    Stock #: MPC20160025

    ISSN:2165-3992

    DOI: 10.1520/MPC20160025

    Author
    Title Quantitative Characterization of Hypoeutectic Aluminum–Silicon–Copper As-Cast Alloy Microstructures
    Symposium ,
    Committee E04