Plane stress fracture behaviour was measured for magnesium alloys AM60B, AM50A, and AZ91D produced by high-pressure die casting. Compact Tension (CT) specimens were obtained from plate samples with approximately 2-5 mm thickness. The compliance unloading technique was used to record crack extension for each specimen. The AM50A and AM60B specimens exhibited stable crack extension beyond ASTM E 1820 limits for Jmax (33 kJ m(exp-2) and 22 kJ m(exp-2), respectively delta a max (2.1 mm and 1.3 mm, respectively). The data were in good agreement with a power law fit for J vs. delta a. The AZ91D samples had unstable crack extension, with a flat R-curve and a critical fracture energy Jc of 7.5 kJ m(exp-2). All fractures were by microvoid coalescence, initiated between the primary Mg grains and the brittle Mg17Al12 phase. Microstructure was typical of high pressure die casting, with small diameter primary Mg grains plus divorced eutectic of Mg + Mg17Al12. Uniaxial tension properties were in agreement with handbook values for elastic modules, yield strength, ultimate tensile strength, and fracture strain.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Plane stress fracture toughness testing of die cast magnesium alloys


    Additional title:

    Bruchzähigkeitsprüfung für Magnesium-Druckgußlegierungen bei Flächenspannung


    Contributors:


    Publication date :

    2002


    Size :

    6 Seiten, 14 Bilder, 3 Tabellen, 14 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Plane Stress Fracture Toughness Testing of Die Cast Magnesium Alloys

    Padfield, Cory J. / Padfield, Toby V. | SAE Technical Papers | 2002


    Plane stress fracture toughness testing of die cast magnesium alloys

    Padfield,C.J. / Padfield,T.V. / General Motors,US et al. | Automotive engineering | 2002


    2002-01-0077 Plane Stress Fracture Toughness Testing of Die Cast Magnesium Alloys

    Padfield, C. J. / Padfield, T. V. / Society of Automotive Engineers | British Library Conference Proceedings | 2002


    Fracture toughness-strength relationships in aluminum-zinc-magnesium-copper alloys.

    Zinkham, R. E. / Liebowitz, H. / Jones, D. J. | NTRS | 1972


    Fracture toughness testing

    Srawley, John E. / Brown, William F. | TIBKAT | 1965