2026-07-29T05:50:24Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/81832023-12-06T01:05:13Zcom_10259_6214com_10259_5086com_10259_2604com_10259_8139com_10259_3808com_10259.4_106col_10259_6215col_10259_8140

Preciado Calzada, Mónica Bravo Díez, Pedro Miguel Cárdenas Gonzalo, David 2023-12-05T10:26:46Z 2023-12-05T10:26:46Z 2016-10 0094-4289 http://hdl.handle.net/10259/8183 10.1115/1.4033466 1528-8889 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. This work was supported by the project MAGNO CENIT (2011) application/pdf eng American Society of Mechanical Engineers Journal of Engineering Materials and Technology. 2016, V. 138, n. 4, 041006 https://doi.org/10.1115/1.4033466 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Fatigue Materials processing Fracture (Materials) High pressure (Physics) Magnesium alloys High pressure (Physics) Magnesium alloys Porosity Resistencia de materiales Ingeniería Strength of materials Engineering Influence of Porosity in the Fatigue Behavior of the High-Pressure Die-Casting AZ91 Magnesium Alloys info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Journal of Engineering Materials and Technology 138 4