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.
Plane stress fracture toughness testing of die cast magnesium alloys
Bruchzähigkeitsprüfung für Magnesium-Druckgußlegierungen bei Flächenspannung
2002
6 Seiten, 14 Bilder, 3 Tabellen, 14 Quellen
Conference paper
English
Plane Stress Fracture Toughness Testing of Die Cast Magnesium Alloys
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