Plane Stress Fracture Toughness Testing of Die Cast Magnesium Alloys General Motors Corporation

Format:

Conference/Event

Author/Creator:

Padfield, Cory J., author.

Conference Name:

SAE 2002 World Congress & Exhibition (2002-03-04 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2002

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

2002-01-0077

Access Restriction:

Restricted for use by site license