Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573362 | Materials Science and Engineering: A | 2016 | 7 Pages |
Abstract
High temperature tensile creep tests were conducted on AZ31 Magnesium alloy at low stress range of 1-13Â MPa to clarify the existence of grain boundary sliding (GBS) mechanism during creep deformation. Experimental data within the GBS regime shows the stress exponent is ~2 and the activation energy value is close to that for grain boundary diffusion. Analyses of the fracture surface of the sample revealed that the GBS provides many stress concentrated sites for diffusional cavities formation and leads to premature failure. Scanning electron microscopy images show the appearances of both ductile and brittle type fracture mechanism. X-ray diffraction line profile analysis (based on Williamson-Hall technique) shows a reduction in dislocation density due to dynamic recovery (DRV). A correlation between experimental data and Langdon's model for GBS was also demonstrated.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Peiman Shahbeigi Roodposhti, Apu Sarkar, Korukonda Linga Murty, Harold Brody, Ronald Scattergood,