Testing the Superplastic Flow Characteristics of Advanced Aluminum Alloys

    Volume 21, Issue 1 (January 1993)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 8


    Goforth, RE
    Associate professors, Texas A & M University, College Station, TX

    Srinivasan, MN
    Associate professors, Texas A & M University, College Station, TX

    (Received 18 September 1991; accepted 18 February 1992)

    Abstract

    Special test equipment is required in order to determine the superplastic flow characteristics of advanced aluminum alloys such as the low-density aluminum-lithium alloys and the high-temperature intermetallics (processed by rapid solidification, mechanically alloying, powder metallurgy techniques). The superplastic flow characteristics under optimum conditions of strain race and temperature are necessary as input data to the computer process model weed to predict optimum pressure-time cycles for the SPF process. Most published tensile flow stress data for superplastic deformation was developed under constant crosshead speeds and at atmospheric pressure. In order to establish accurate flow characteristics, testing must be conducted: (1) at a closely controlled temperature, (2) at a controlled constant true strain rate, and (3) under hydrostatic pressure (to prevent cavitation). This paper discusses the design and development of a test system with these capabilities and also highlights typical results for three aluminum-lithium alloys.


    Paper ID: JTE11739J

    DOI: 10.1520/JTE11739J

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    Author
    Title Testing the Superplastic Flow Characteristics of Advanced Aluminum Alloys
    Symposium , 0000-00-00
    Committee B07