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Plane Stress Fracture Toughness Testing of Die Cast Magnesium Alloys
Technical Paper
2002-01-0077
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Plane stress fracture behavior 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-2 and 22 kJ m-2, respectively) and Δamax (2.1 mm and 1.3 mm, respectively). The data were in good agreement with a power law fit for J vs. Δa. The AZ91D samples had unstable crack extension, with a flat R-curve and a critical fracture energy Jc of ∼ 7.5 kJ m-2. All fractures were by microvoid coalescence, initiated between the primary Mg grains and the brittle Mg17Al12 phase.
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Citation
Padfield, C. and Padfield, T., "Plane Stress Fracture Toughness Testing of Die Cast Magnesium Alloys," SAE Technical Paper 2002-01-0077, 2002, https://doi.org/10.4271/2002-01-0077.Also In
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