RT info:eu-repo/semantics/article
T1 Influence of Porosity in the Fatigue Behavior of the High-Pressure Die-Casting AZ91 Magnesium Alloys
A1 Preciado Calzada, Mónica
A1 Bravo Díez, Pedro Miguel
A1 Cárdenas Gonzalo, David
K1 Fatigue
K1 Materials processing
K1 Fracture (Materials)
K1 High pressure (Physics)
K1 Magnesium alloys
K1 High pressure (Physics)
K1 Magnesium alloys
K1 Porosity
K1 Resistencia de materiales
K1 Strength of materials
K1 Ingeniería
K1 Engineering
AB The fatigue properties of high-pressure die-casting (HPDC) magnesium (Mg) alloys AZ91 exhibit a high variability, due primarily to the porosity that is inherent in the injection process. In the 94% of the studied samples, the porosity in which crack nucleation originates is at the surface or adjacent to the surface. The threshold stress intensity factor amplitude and the limit of fatigue have been calculated following the classical models of parameterization of defects. A new set of samples were prepared by machining the surface slightly, in order to conserve the microstructure, and the fatigue behavior at low level of stress was improved. All the samples were produced in molds with the final shape by HPDC process, which allowed a realistic study of the surface effect and the influence of grain size variation from the edge to the center of the samples.
PB American Society of Mechanical Engineers
SN 0094-4289
YR 2016
FD 2016-10
LK http://hdl.handle.net/10259/8183
UL http://hdl.handle.net/10259/8183
LA eng
NO This work was supported by the project MAGNO CENIT (2011)
DS Repositorio Institucional de la Universidad de Burgos
RD 09-may-2024