Now showing items 1-20 of 22

    • Effect of minor Co additions on the crystallization and magnetic properties of Fe(Co)NbBCu alloys 

      Torrens Serra, Joan; Bruna Escuer, Pere; Roth, Segmar; Rodríguez Viejo, Javier; Clavaguera Mora, Maria Teresa (2010)
      Article
      Open Access
      The effect of partial replacement of Fe by Co (up to 8 %) on thermal stability, structure and magnetic properties of FeNbBCu alloys has been explored in this paper. The results indicate that Co reduces the stability against ...
    • Fe in P-doped basaltic melts: a Mössbauer spectroscopy study 

      Tarragó Aymerich, Mariona; García-Vallès, Maite; Méndez Martínez, Salvador; Pradell Cara, Trinitat; Bruna Escuer, Pere (2018-10-01)
      Article
      Open Access
      The addition of P to a basalt causes a change in the environment of Fe. At low P contents iron is located in the glass structure and the Fe3+/Fe2+ ratio is about 80/20. Further addition of P causes a collapse of the glass ...
    • 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 ...
    • Glass-formation and corrosion properties of Fe-Cr-Mo-C-B glassy ribbons with low Cr content 

      Madinehei, Seyed Milad; Bruna Escuer, Pere; Duarte Correa, María Jazmín; Pineda Soler, Eloi; Klemm, Julia; Renner, Frank U. (2014-12-05)
      Article
      Open Access
      The effect of low amounts of Cr on glass forming ability and corrosion behavior of Fe(65-x)CrxMo14C15B6 (x = 0, 2, 4, 6, 8,10 at.%) ribbons have been studied. It was found that the reduced glass transition temperature ...
    • Glass-forming ability and microstructural evolution of [(Fe0.6Co0.4)0.75Si0.05B0.20]96-xNb4Mx metallic glasses studied by Mössbauer spectroscopy 

      Torrens Serra, Joan; Bruna Escuer, Pere; Stoica, Mihai; Eckert, Jurgen (2017-05-15)
      Article
      Open Access
      The effect of minor transition metals and rare earths on glass-forming ability, thermal stability and crystallization of [(Fe0.6Co0.4)0.75Si0.05B0.20]96-xNb4Mx alloys was investigated. The thermodynamic parameters traditionally ...
    • Influence of a magnetic field applied during the quenching process on the spin density and nanoscale structure of an amorphous Fe-B ribbon 

      Bonastre, J.; Suñol Martinez, Juan Jose; Bruna Escuer, Pere; Sato, K.; Santos, J.D.; Hernando, B. (2012-11-15)
      Article
      Restricted access - publisher's policy
      The application of a magnetic field to the melt in the transverse direction of the wheel rotation during the solidification process induces magnetic anisotropy in amorphous magnetic ribbons. This procedure is here applied ...
    • 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
      Open Access
      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 ...
    • 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 and modelling in primary crystallization 

      Bruna Escuer, Pere (Universitat Politècnica de Catalunya, 2007-11-15)
      Doctoral thesis
      Open Access
      L'objectiu de la tesi és estudiar la cinètica de les cristal·litzacions primàries en vidres metàl·lics mitjançant simulacions de tipus phase field. Una cristal·lització primària és una transició de fase sòlid-sòlid on la ...
    • New (FeCoCrNi)-(B,Si) high-entropy metallic glasses, study of the crystallization processes by X-ray diffraction and Mössbauer spectroscopy. 

      Panahi, Seyedeh Leila; Garcia-Ramón, María; Pineda Soler, Eloi; Bruna Escuer, Pere (2020-07-16)
      Article
      Restricted access - publisher's policy
      The role of B and Si in the formation of (FeCoCrNi) 100-x-y B x Si y high-entropy metallic glasses is studied. It is found that a content of B between 10 and 20 at% and of Si between 5 and 15 at% is able to produce a ...
    • 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 ...
    • Polyamorphic transitions in Ce-based metallic glasses by synchrotron radiation 

      Duarte Correa, María Jazmín; Bruna Escuer, Pere; Pineda Soler, Eloi; Crespo Artiaga, Daniel; Garbarino, Gaston; Verbeni, Roberto; Zhao, Kun; Wang, Wei Hua; Romero Castro, Aldo Humberto; Serrano Gutiérrez, Jorge (2011-12-01)
      Article
      Open Access
      We report here on a polyamorphic-phase transition upon application of pressure on a Ce-based metallic glass, Ce70Al10Ni10Cu10, investigated by x-ray diffraction and inelastic x-ray scattering. This alloy is found to display ...
    • Quantum computing : problems and exercises 

      Torres Gil, Santiago; Bruna Escuer, Pere; Massignan, Pietro Alberto (Iniciativa Digital Politècnica. Oficina de Publicacions Acadèmiques Digitals de la UPC, 2020-07)
      Book
      Restricted access to the UPC academic community
      Quantum technology is one of the most promising and challenging fields in contemporary science. Quantum computing, quantum cryptography, and more generally quantum information technologies claim that they, in the short ...
    • Role of Mo in the local configuration and structure stabilization of amorphous steels, a Synchrotron X-ray diffraction and Mossbauer study 

      Pineda Soler, Eloi; Bruna Escuer, Pere; Serrano Gutiérrez, Jorge; Torrens Serra, Joan; Crespo Artiaga, Daniel (2011-07)
      Article
      Restricted access - publisher's policy
      Amorphous steels are promising materials with potential structural applications. The glass-forming ability (GFA) and mechanical properties of metallic glasses are intimately related to the local structure. In Fe-based ...
    • Structural evolution of metallic glasses during annealing through in-situ Synchrotron X-ray diffract 

      Pineda Soler, Eloi; Boneu, Francesc; Bruna Escuer, Pere; Pradell Cara, Trinitat; Labrador, Ana; Crespo Artiaga, Daniel (2008-05)
      Article
      Open Access
      In this work we study the structural evolution of Al and Fe based metallic glass compositions. The samples were obtained as ribbons by melt-spinning, their glass stability and crystallization were analyzed by calorimetry ...
    • Structural study of conventional and bulk metallic glasses during annealing 

      Pineda Soler, Eloi; Hidalgo, I.; Bruna Escuer, Pere; Pradell Cara, Trinitat; Labrador, Ana; Crespo Artiaga, Daniel (2007)
      Article
      Open Access
      Metallic glasses with conventional glass-forming ability (Al-Fe-Nd, Fe-Zr-B, Fe-B-Nb compositions) and bulk metallic glasses (Ca-Mg-Cu compositions) were studied by synchrotron X-ray diffraction during annealing throughout ...
    • Structure and Mössbauer analysis of melt-spun Fe-Pd ribbons containing Ni and Co 

      Rekik, Hanen; Chemingi, Mahmoud; Bachaga, Tarek; Cherif, Amal; Bruna Escuer, Pere; Suñol Martinez, Juan Jose; Khitouni, Mohamed (2015-06-05)
      Article
      Open Access
      Fe68.45Pd28.21Co1.66Ni1.66 alloy in ribbon geometry was produced by melt spinning. The microstructure of the samples was examined using scanning electron microscopy. The structural identification of the as-spun ribbon ...