|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||The Small Fatigue Crack Growth Behavior of an AM60 Magnesium Alloy
||Zhe Chen, Amit Shyam, Jack Huang, Ray S. Decker, Steve E. LeBeau, Carl J. Boehlert
|On-Site Speaker (Planned)
The small fatigue crack growth behavior of a nanoMAG AM60 magnesium alloy was investigated. The effect of microstructure and texture, which resulted from thermomechanical processing and subsequent heat treatment, on the small fatigue crack growth behavior was evaluated. The effect of mechanical loading parameters such as maximum stress and load-ratio was also determined. Artificial notches with size of few hundreds of microns were machined on test specimens and the growth behavior of physically small fatigue cracks emanating from notches was directly measured with the aid of a long working distance optical microscope. A maximum stress effect for the propagation rate of small cracks was identified. Fracture surface characterization suggested that the fatigue crack propagation mechanism was a mixture of transgranular and intergranular crack growth. Porosity and other material defects were found to determine the fatigue crack initiation and propagation behavior, while the role of grain size was secondary.
||Definite: A CD-only volume