Publication: Síntesis de las aleaciones Ti4522 y Ti4522XD vía aleación mecánica
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2011-07-29
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2011-07-29
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Abstract
Los compuestos intermetálicos se erigen como una nueva clase de materiales cada vez más importante. Entre las distintas familias, los aluminuros de titanio resultan atractivos para la industria aeronáutica debido a su bajo peso y gran resistencia a altas temperaturas. La aleación mecánica es una técnica de procesado de polvos en estado sólido que involucra repetidas fases de soldadura y fractura de partículas de polvo mediante choques de alta energía en un molino de bolas. Es precisamente la característica de realizarse en estado sólido lo que le confiere la ventaja competitiva, al eliminar problemas asociados a puntos de fusión y solubilidades relativas. En el presente proyecto se ha estudiado la síntesis de las aleaciones Ti45Al2Nb2Mn (Ti4522) y Ti45Al2Nb2Mn + 0.8 % vol. TiB2 (Ti4522XD) vía aleación mecánica seguida de tratamiento térmico aplicado mediante calorimetría diferencial de barrido. Para ello se analizó y caracterizó el polvo mediante ensayos de densidad aparente, difracción de rayos X, estudios de la morfología y tamaño de partícula; así como análisis de transiciones de fases del material. El objetivo principal de este estudio es el análisis del procesado mediante aleación mecánica de las aleaciones Ti4522 y Ti4522XD. Para ello se optimizarán las condiciones de molienda del procesado del intermetálico -TiAl y se procederá a la caracterización del polvo procesado. _______________________________________________________________________________________________
Intermetallic compounds have become a very important new materials class as time goes by. Titanium aluminides result attractive among the different families considering their low weight and high-temperature resistance. Mechanical alloying is a solid-state powder processing technique involving repeated welding and fracturing of powder particles in a high-energy ball mill. Solid-state development is what confers it a competitive advantage due to the avoiding of problems associated to melting temperatures and relative solubility. Ti45Al2Nb2Mn (Ti4522) and Ti45Al2Nb2Mn + 0.8 % vol. TiB2 (Ti4522XD) synthesis by mechanical alloying followed by thermal treatment (applied through Differential Scanning Calorimetry) have been studied. The powder was analyzed and characterized by bulk density essays, X-ray diffraction, morphology and size particle analysis; as well as phases´ transition analysis. The main objective of this project is studying mechanical alloying process for Ti4522 and Ti4522XD alloys. Milling conditions will be optimized and an exhaustive characterization of the resulting powder will be done in order to achieve it.
Intermetallic compounds have become a very important new materials class as time goes by. Titanium aluminides result attractive among the different families considering their low weight and high-temperature resistance. Mechanical alloying is a solid-state powder processing technique involving repeated welding and fracturing of powder particles in a high-energy ball mill. Solid-state development is what confers it a competitive advantage due to the avoiding of problems associated to melting temperatures and relative solubility. Ti45Al2Nb2Mn (Ti4522) and Ti45Al2Nb2Mn + 0.8 % vol. TiB2 (Ti4522XD) synthesis by mechanical alloying followed by thermal treatment (applied through Differential Scanning Calorimetry) have been studied. The powder was analyzed and characterized by bulk density essays, X-ray diffraction, morphology and size particle analysis; as well as phases´ transition analysis. The main objective of this project is studying mechanical alloying process for Ti4522 and Ti4522XD alloys. Milling conditions will be optimized and an exhaustive characterization of the resulting powder will be done in order to achieve it.
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Materiales compuestos, Compuestos intermetálicos, Aleaciones metálicas