Now showing items 21-40 of 63

  • Element-Resolved Corrosion Analysis of Stainless-Type Glass-Forming Steels 

    Duarte, Maria Jazmin; Klemm, J.; Klemm, S.O.; Mayrhofer, K. J. J.; Stratmann, M.; Borodin, S.; Romero, A.H.; Madinehei, Seyed Milad; Crespo Artiaga, Daniel; Serrano, J.; Gerstl, S. S. A.; Choi, Pyuck-Pa; Raabe, D.; Renner, Frank U. (2013-07-26)
    Article
    Restricted access - publisher's policy
    Ultrathin passive films effectively prevent the chemical attack of stainless steel grades in corrosive environments; their stability depends on the interplay between structure and chemistry of the constituents iron, chromium, ...
  • Fatigue life analysis of un-repaired and repaired metallic substrate using FRANC2D 

    Pitta, Siddharth; Rojas Gregorio, José Ignacio; Crespo Artiaga, Daniel; Wahab, Magd Abdel (2018)
    Conference lecture
    Restricted access - publisher's policy
    We present numerical investigations on fatigue life analysis of un-re-paired and repaired metallic substrate. Most of the engineering structures fail due to fatigue under dynamic loading. While research is mostly focused ...
  • Formation and deposition of stable silver nanoparticles encapsulated in solid spheres 

    Sue, S. H.; Popa, Mónica Mihaela; Torres Padrosa, Víctor; Crespo Artiaga, Daniel; Shin, H. K.; Calderon Moreno, José Maria (2014-08-01)
    Article
    Restricted access - publisher's policy
    We prepared solid spheres, with diameters between 100 and 400 nm, encapsulating silver nanocrystallites (about 20 +/- 10 nm in diameter), by heating colloidal solutions of silver in methoxyethanol at 120 degrees C. Stable ...
  • Fragility measurement of Pd-based metallic glass by dynamic mechanical analysis 

    Pineda Soler, Eloi; Serrano Gutiérrez, Jorge; Bruna Escuer, Pere; Crespo Artiaga, Daniel (2010-08)
    Article
    Restricted access - publisher's policy
    The measurement of fragility of glass-forming liquids involves either the determination of viscosity at different temperatures above the glass transition or the measurement of the dynamic glass–liquid transition by ...
  • Influence of carbon content on microstructure and properties of a steel matrix cermet 

    Alvaredo Olmos, Paula; Bruna Escuer, Pere; Crespo Artiaga, Daniel; Gordo Odériz, Elena (2018-09-01)
    Article
    Restricted access - publisher's policy
    There is a marked correlation between the composition, microstructure and properties in TiCN-based cermets. In the case of using iron alloys as metallic matrix the carbon content is of particular significance, as not only ...
  • Innovative NDT technique based on ferrofluids for detection of surface crack 

    Rojas Gregorio, José Ignacio; Cabrera, Blai; Musterni Girbau, Gerard; Nicolas, Jorge; Tristancho Martínez, Joshua; Crespo Artiaga, Daniel (2015-11)
    Article
    Open Access
    An innovative NDT technique is proposed for surface inspection of materials not necessarily magnetic or conductive, based on local magnetic field variations due to ferrofluid deposited in the cracks. The feasibility of the ...
  • Innovative NDT technique for detection of surface cracks based on ferrofluids excited with DC and AC magnetic fields 

    Rojas Gregorio, José Ignacio; Cabrera, Blai; Musterni, Gerard; Nicolas, Jorge; Tristancho Martínez, Joshua; Crespo Artiaga, Daniel (2015-03-31)
    External research report
    Open Access
    An innovative NDT technique is proposed for surface inspection of materials not necessarily magnetic or conductive, based on local magnetic field variations due to ferrofluid deposited in the cracks. The feasibility of the ...
  • Investigation on repairs of aircraft composite structures made with various joining techniques 

    Pitta, Siddharth; Roure Fernández, Francisco; Crespo Artiaga, Daniel; Rojas Gregorio, José Ignacio (2018)
    Conference lecture
    Restricted access - publisher's policy
    In the race for developing aircraft with lighter airframe, aiming at increasing aircraft payload and/or fuel efficiency, the shift from conventional metal structures to light-weight composite structures has attracted ...
  • Kinetics and crystallization path of a Fe-based metallic glass alloy 

    Duarte, Maria Jazmin; Kostka, Aleksander; Crespo Artiaga, Daniel; Jiménez Rodríguez, José Antonio; Dippel, A. C.; Renner, Frank U.; Dehm, G. (2017-04-01)
    Article
    Open Access
    The thermal stability and the quantification of the different transformation processes involved in the overall crystallization of the Fe50Cr15Mo14C15B6 amorphous alloy were investigated by several characterization techniques. ...
  • Mechanical relaxation of metallic glasses: an overview of experimental data and theoretical models 

    Liu, Chaoren; Pineda Soler, Eloi; Crespo Artiaga, Daniel (2015-06)
    Article
    Open Access
    Relaxation phenomena in glasses are a subject of utmost interest, as they are deeply connected with their structure and dynamics. From a theoretical point of view, mechanical relaxation allows one to get insight into the ...
  • Microstructural characterization and kinetics modelization of vermicular cast irons. 

    Laneri, Karina; Bruna Escuer, Pere; Crespo Artiaga, Daniel (2007)
    Article
    Open Access
    Several experimental techniques are used for phase identification and microstructure characterization of austempered vermicular cast irons (XRD, SEM, TEM and Mössbauer spectroscopy). Acicular structures were found to be ...
  • Microstructural characterization & viscoelastic properties of AlZnMgCu alloys for aerospace applications 

    Rojas Gregorio, José Ignacio; Crespo Artiaga, Daniel (2010-07)
    Doctoral thesis proposal
    Open Access
    The mechanical properties of materials (and particularly the viscoelastic properties) are intimately linked to their microstructure. Thereby, microstructural transformations are reflected on the viscoelastic behaviour. ...
  • Modeling of the effect of temperature, frequency, and phase transformations on the viscoelastic properties of AA 7075-T6 and AA 2024-T3 Aluminum Alloys 

    Rojas Gregorio, José Ignacio; Crespo Artiaga, Daniel (2012-12-01)
    Article
    Open Access
    The viscoelastic response of commercial aluminum alloys 7075-T6 and 2024-T3 as a function of temperature is presented. Experimental data are obtained with a dynamic-mechanical analyzer (DMA) at different loading frequencies ...
  • Modeling of the Sub-Tg Relaxation Spectrum of Pd42.5Ni7.5Cu30P20 Metallic Glass 

    Liu, Chaoren; Pineda Soler, Eloi; Crespo Artiaga, Daniel; Qiao, Jichao (2016-03-17)
    Article
    Open Access
    In this work we study the mechanical relaxation spectrum of Pd42.5Ni7.5Cu30P20 metallic glass. The effect of aging on the relaxation behavior is analyzed by measuring the internal friction during consecutive heating runs. ...
  • Onset frequency of fatigue effects in pure aluminum and 7075 (AlZnMg) and 2024 (AlCuMg) alloys 

    Rojas Gregorio, José Ignacio; Crespo Artiaga, Daniel (2016-03)
    Article
    Open Access
  • On the static strength of aluminium and carbon fibre aircraft lap joint repairs 

    Pitta, Siddharth; de la Mora Carles, Victor; Roure Fernández, Francisco; Crespo Artiaga, Daniel; Rojas Gregorio, José Ignacio (2018-10-01)
    Article
    Restricted access - publisher's policy
    The behaviour of various aircraft lap joint repair configurations is investigated experimentally and numerically under static loading. The lap joints consist of aluminium alloy (AA) 2024-T3 substrates repaired with twin ...
  • On the validity of Avrami formalism in primary crystallization 

    Bruna Escuer, Pere; Crespo Artiaga, Daniel; González Cinca, Ricardo; Pineda Soler, Eloi (American Institute of Physics, 2006-09-30)
    Article
    Open Access
    Calorimetric data of primary crystallization is usually interpreted in the framework of the Kolmogorov Dokl. Akad. Nauk SSSR 1, 355 1937 , Johnson and Mehl Trans. AIME 135, 416 1939 , and Avrami J. Chem. Phys. 7, ...
  • Phase-field modeling of microstructural evolution in primary crystallization 

    Bruna Escuer, Pere; Pineda Soler, Eloi; Rojas Gregorio, José Ignacio; Crespo Artiaga, Daniel (2014)
    Conference lecture
    Open Access
  • Phase-field modelling of microstructural evolution in primary crystallization 

    Bruna Escuer, Pere; Pineda Soler, Eloi; Crespo Artiaga, Daniel (2007)
    Article
    Open Access
    One of the main routes to obtain nanostructured materials is through the primary crystallization of metallic glasses. In such transformations, crystallites with a different composition than the amorphous precursor grow with ...
  • Phonon dispersion relation of metallic glasses 

    Crespo Artiaga, Daniel; Bruna Escuer, Pere; Vallés Sales, Araceli; Pineda Soler, Eloi (American Physical Society, 2016-10-13)
    Article
    Open Access
    Experimental data on the phase sound speed of metallic glasses show anomalies in the terahertz range, reflecting an underlying complex behavior of their phonon dispersion spectrum not yet explained. We determine the phonon ...