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Síntesis y caracterización de Fe40Ni40Ag20 y (FeNi)80Ag20 mecánicamente aleados
BONYUET,D; GONZáLEZ,G; OCHOA,J; GONZáLEZ-JIMéNEZ,F; D′ONOFRIO,L;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: mechanical alloying (ma) is a process that has shown to be a versatile tool to produce nanostructured composites and alloys from normally immiscible elements. it has the advantage that the parameters of the process can be varied in order to control the grade of the alloy and the microstructure characteristics. in this form, it is possible to produce magnetic materials with new properties. the phase diagrams of ni-ag and fe ag show that mutual solubility is very low in the liquid state as in the solid state. however, it has been able to obtain partial solid solutions in these systems by mechanical alloying and other techniques. because the ball milling process is a non equilibrium technique, it is possible to force the mixture of immiscible elements. in this work we present a study of the ternary system fe-ag-ni, preparing by mechanical alloying fe40ni40ag20 and (feni)80ag20 in a spex 8000 mixer/mill. then we characterized the samples by x-ray diffraction (xrd), transmission electron microscopy (tem) and m?ssbauer spectroscopy. the nanometric size grain is confirmed by xrd. m?ssbauer spectroscopy indicates the grade of alloying after different milling times.
STUDY OF THE Fe-75%Ag SYSTEM OBTAINED BY MECHANICAL ALLOYING
Bonyuet,D; González,G; Ochoa,J; Gonzalez-Jimenez,F; D′Onofrio,L;
Revista Latinoamericana de Metalurgia y Materiales , 2002,
Abstract: mechanical alloying (ma) is a powder processing technique, which allows us to induce solid state reactions in binary systems immiscible in equilibrium. fe and ag have a mutually repulsive nature that makes them completely immiscible under thermodynamically stable conditions. the ball milling process being a non-equilibrium technique seems promising in obtaining at least a partial solid solution in this system. mixtures of fe and ag powders with 75 wt% ag were studied by x-ray diffraction (xrd), scanning electron microscopy (sem) and transmission electron microscopy (tem). we have found that it is possible to obtain a small mutual solid solution in this system by ma. this is also confirmed by m?ssbauer spectroscopy.
STUDY OF THE Fe-75%Ag SYSTEM OBTAINED BY MECHANICAL ALLOYING
D Bonyuet,G González,J Ochoa,F Gonzalez-Jimenez
Revista Latinoamericana de Metalurgia y Materiales , 2002,
Abstract: Mechanical alloying (MA) is a powder processing technique, which allows us to induce solid state reactions in binary systems immiscible in equilibrium. Fe and Ag have a mutually repulsive nature that makes them completely immiscible under thermodynamically stable conditions. The ball milling process being a non-equilibrium technique seems promising in obtaining at least a partial solid solution in this system. Mixtures of Fe and Ag powders with 75 wt% Ag were studied by x-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We have found that it is possible to obtain a small mutual solid solution in this system by MA. This is also confirmed by M ssbauer spectroscopy. Aleación Mecánica (AM) es una técnica de procesamiento de polvos, la cual nos permite inducir reacciones de estado sólido en sistemas binarios inmiscibles en el equilibrio. Fe y Ag tienen una naturaleza mutuamente repulsiva que las hace completamente inmiscibles bajo condiciones termodinámicamente estables. El proceso de molienda por bolas, siendo una técnica fuera del equilibrio, parece prometedor para obtener al menos una solución sólida parcial en este sistema. Mezclas de polvos de Fe y Ag con 75 % en peso de Ag fueron estudiados mediante difracción de rayos x (DRX), microscopía electrónica de barrido (MEB), y microscopía electrónica de transmisión (MET). Hemos encontrado que es posible obtener una peque a solución sólida parcial en este sistema mediante AM. Esto es confirmado mediante espectroscopia M ssbauer.
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