Now showing items 21-40 of 89

    • Deformation mechanism induced under high cycle fatigue test in a metaestable austenitic stainless steel 

      Roa Rovira, Joan Josep; Fargas Ribas, Gemma; Jiménez Piqué, Emilio; Mateo García, Antonio Manuel (2014)
      Article
      Restricted access - publisher's policy
      Advanced techniques were used to study the deformation mechanisms induced by fatigue tests in a metastable austenitic stainless steel AISI 301LN. Observations by Atomic Force Microscopy were carried out to study the evolution ...
    • Deformation mechanisms induced under high cycle fatigue tests in a metastable austenitic stainless steel 

      Roa Rovira, Joan Josep; Fargas Ribas, Gemma; Jiménez Piqué, Emilio; Mateo García, Antonio Manuel (2014)
      Article
      Restricted access - publisher's policy
      Advanced techniques were used to study the deformation mechanisms induced by fatigue tests in a metastable austenitic stainless steel AISI 301LN. Observations by Atomic Force Microscopy were carried out to study the evolution ...
    • Deformation of polycrystalline TRIP stainless steel micropillars 

      Roa Rovira, Joan Josep; Wheeler, J.M.; Trifonov, T.; Fargas Ribas, Gemma; Mateo García, Antonio Manuel; Michler, J; Jiménez Piqué, Emilio (2015)
      Article
      Open Access
      The deformation mechanisms of the metastable austenite phase of a transformation induced plasticity (TRIP) stainless steel, AISI 301LN, have been investigated by compression of multicrystalline micropillars of different ...
    • Dependence of nanoindentation hardness with crystallographic orientation of austenite grains in metastable stainless steels 

      Roa Rovira, Joan Josep; Fargas Ribas, Gemma; Mateo García, Antonio Manuel; Jiménez Piqué, Emilio (2015-10-01)
      Article
      Restricted access - publisher's policy
      The mechanical behaviour of a metastable austenitic stainless steel has been studied by means of nanoindentation of individual grains. Hardness, elastic modulus and estimation of wear resistance were determined as a function ...
    • Determinación de propiedades de interés estructural de materiales de titanato de circonio 

      López López, Emilio; Botero Vega, Carlos Alberto; Jiménez Piqué, Emilio; Llanes Pitarch, Luis Miguel; Moreno, Rodrigo; Baudín, Carmen (2009)
      Article
      Restricted access - publisher's policy
      El titanato de circonio presenta anisotropía cristalográfica en su coeficiente de expansión térmica, lo que hace que tenga un alto interés como componente de materiales con bajo coeficiente de expansión. Por tanto, los ...
    • Efecto de la morfología de grietas generadas por nanoindentación y su efecto en el cálculo de la tenacidad de fractura 

      Cuadrado, Núria; Jiménez Piqué, Emilio; Casellas Padró, Daniel; Anglada Gomila, Marcos Juan (2011)
      Conference report
      Open Access
      En el presente trabajo se ha utilizado la técnica de nanoindentación para inducir grietas en diferentes materiales cerámicos y estudiar la morfología de grieta generada por la aplicación de un indentador tipo Berkovich. ...
    • Enhanced hydrothermal resistance of Y-TZP ceramics through colloidal processing 

      Rayón Encinas, Emilio; Moreno, R.; Alcázar, C.; Salvador Moya, Maria Dolores; Manjon Herrera, Francisco Javier; Jiménez Piqué, Emilio; Llanes Pitarch, Luis Miguel (2013-02-28)
      Article
      Restricted access - publisher's policy
      Two commercial zirconia powders with 3 mol% of yttria (TZ3YE and TZ3YS, labeled as ZE and ZS, respectively) sup- plied by Tosoh (Japan) were used for this study. Maximum colloidal stability for ZE was achieved by ...
    • Enhancement of mechanical properties of ceria-calcia stabilized zirconia by alumina reinforcement 

      Tovar Vargas, Daniela; Turon Viñas, Miquel; Anglada Gomila, Marcos Juan; Jiménez Piqué, Emilio (Elsevier, 2020-01-01)
      Article
      Restricted access - publisher's policy
      Zirconia ceramics stabilized using 10 mol% CeO2 and 1 mol% CaO were studied with the addition of small amounts of a-alumina. The elaboration process of five different compositions was done by wet mixing of powders using ...
    • Estudio de la morfologia de grietas generadas por nanoindentación y su efecto en el cálculo de la tenacidad de fractura 

      Anglada Gomila, Marcos Juan; Jiménez Piqué, Emilio; Cuadrado Lafoz, Núria (2011)
      Conference report
      Open Access
      En el presente trabajo se ha utilizado la técnica de nanoindentación para inducir grietas en diferentes materiales cerámicos y estudiar la morfología de grieta generada por la aplicación de un indentador tipo Berkovich . ...
    • Estudio de los mecanismos de deformación plástica inducidos por nanoindentación en materiales superconductores de YBCO 

      Roa Rovira, Joan Josep; Tromas, Christophe; Jiménez Piqué, Emilio; MARTÍN, V; Morales Comas, Miguel; Segarra Rubi, Merce (2016)
      Conference lecture
      Open Access
    • Estudio por nanoindentación de 3Y-TZP envejecida por degradación hidrotérmica 

      Armas Sancho, Zamir de; García Marro, Fernando; Jiménez Piqué, Emilio; Anglada Gomila, Marcos Juan (2010)
      Conference report
      Open Access
      La circona tetragonal policristalina estabilizada con 3% molar de itria (3Y-TZP) puede transformarse espontáneamente a la fase monoclínica en presencia de vapor de agua a temperaturas relativamente bajas, lo cual conlleva ...
    • Evaluation of fracture toughness of small volumes by means of cube-corner nanoindentation 

      Cuadrado Lafoz, Núria; Casellas Padró, Daniel; Anglada Gomila, Marcos Juan; Jiménez Piqué, Emilio (2012-03)
      Article
      Open Access
      In this work, the applicability of the two most commonly used equations for calculating the fracture toughness by nanoindentation is discussed in terms of the indenter geometry and the indentation crack morphology. These ...
    • Fatigue susceptibility under contact loading of hardmetals coated with ceramic films 

      Llanes Pitarch, Luis Miguel; Tarrés, E.; Ramírez, Giselle; Botero Vega, Carlos Alberto; Jiménez Piqué, Emilio (2010-04)
      Article
      Restricted access - publisher's policy
      The contact fatigue behavior of a fine-grained hardmetal coated with two distinct ceramic films, either a TiN monolayer or a WC/C multilayer, is studied by means of indentation testing techniques. Spherical indentation ...
    • FIB/FESEM experimental and analytical assessment of R-curve behavior of WC-Co cemented carbides 

      Tarragó Cifre, Jose María; Jiménez Piqué, Emilio; Schneider, Ludwig; Casellas Padró, Daniel; Torres, Y.; Llanes Pitarch, Luis Miguel (2015-10-01)
      Article
      Open Access
      Exceptional fracture toughness levels exhibited by WC-Co cemented carbides (hardmetals) are due mainly to toughening derived from plastic stretching of crack-bridging ductile enclaves. This takes place due to the development ...
    • Focused ion beam tomography of WC-Co cemented carbides 

      Jiménez Piqué, Emilio; Turón Viñas, Miquel; Chen, H.; Todorov Trifonov, Trifon; Fair, Jonathan; Tarrés, E.; Llanes, Angels (2017-09-01)
      Article
      Open Access
      The microstructure of three different grades of WC-Co cemented carbides (hardmetals) has been reconstructed in three dimensions after sequential images obtained by focused ion beam. The three dimensional microstructual ...
    • Focused ion beam tomography of zirconia degraded under hydrothermal conditions 

      Jiménez Piqué, Emilio; Ramos, A.; Muñoz Tabares, José Alejandro; Hatton, A.; Soldera, Flavio; Mucklich, F.; Anglada Gomila, Marcos Juan (Elsevier, 2012-08)
      Article
      Restricted access - publisher's policy
      Three-dimensional tomography was performed on hydrothermal degraded zirconia by sequential focussed ion beam (FIB) sectioning and field emission scanning electron microscopy (FE-SEM) observation. By means of image analysis ...
    • Fractura por contacto en recubrimientos feldespáticos sobre circona dental 

      Rueda Arango, Astrid Oasis; Anglada Gomila, Marcos Juan; Jiménez Piqué, Emilio (2011)
      Conference report
      Restricted access - publisher's policy
      Las restauraciones dentales de circona con recubrimientos feldespáticos se están empleando de manera creciente en aplicaciones dentales debido a su estabilidad química, buena respuesta mecánica y apariencia externa. Sin ...
    • Fracture and fatigue behavior of cement carbides:3D focused ion beam tomography of crack-microstructure interactions 

      Tarragó Cifre, Jose María; Jiménez Piqué, Emilio; Turón Viñas, Miquel; Rivero, Lorenzo; Al-Dawery, Ihsan; Schneider, Ludwig; Llanes Pitarch, Luis Miguel (2014-09-01)
      Article
      Open Access
      The fracture and fatigue phenomena in WC-cobalt cemented carbides (hard-metals) have been subjects extensively investigated in the last 30 years. From these studies, it is well established that the metallic binder phase ...
    • Fracture micromechanisms and mechanical behavior of YBCO bulk superconductors at 77 and 300 K 

      Konstantopoulou, K; Roa Rovira, Joan Josep; Jiménez Piqué, Emilio; Segarra Rubi, Merce; Pastor, J. Y. (2014-09-01)
      Article
      Restricted access - publisher's policy
      In this study two YBa2Cu3O7-delta bulk superconductors were evaluated, with the aim of analyzing the influence of the processing method (TSMG and Bridgman) and the test temperature on their mechanical behavior. The ...
    • Geometry of nanoindentation cube-corner cracks observed by FIB tomography: Implication for fracture resistance estimation 

      Cuadrado Lafoz, Núria; Seuba, J.; Casellas Padró, Daniel; Anglada, M.; Jiménez Piqué, Emilio (Elsevier, 2015-09-01)
      Article
      Open Access
      When indenting a brittle material with a sharp indenter, cracks can be generated at the corners of the imprint. From the length of these cracks, the fracture resistance can be estimated. This technique is simple and allows ...