Preparación de muestras

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Aleaciones Pb-Ca-Sn ricas en Plomo : diagrama de fases y fenómenos de precipitación

Tesis Univ. Complutense de Madrid, 1980.Fac. de Ciencias FísicasTRUEProQuestpu

Aleaciones Pb-Ca-Sn ricas en Plomo : diagrama de fases y fenómenos de precipitación

Tesis Univ. Complutense de Madrid, 1980.Fac. de Ciencias FísicasTRUEProQuestpu

Influence of the processing route on the mechanical properties at high temperatures of Mg-Ni-Y-RE alloys containing LPSO-phases

The mechanical properties at high temperatures of two Mg-Ni-Y-RE alloys prepared by conventional or powder metallurgy routes have been evaluated. All alloys exhibit high-strength up to 250°C but their strength depends more on the composition of the alloy rather than on the processing route. High strength of the alloys arises from their fine grain size but there is an additional contribution of load transfer from the magnesium matrix towards the second phases in the alloys processed by the conventional route while additional hardening in the alloys prepared by powder metallurgy is due to Orowan mechanism. Above 250°C, the strength drops to very low values but all alloys exhibit high elongations and grain boundary sliding is the controlling mechanism. Grain boundary sliding also induces cracking of the coarse second phases into smaller pieces during the initial stages of plastic deformation of conventionally processed alloys

Plasticity analysis by synchrotron radiation in a Mg97Y2Zn1 alloy with bimodal grain structure and containing LPSO phase

© 2015 Acta Materialia Inc. All rights reserved. Deformation behaviour has been examined by synchrotron radiation diffraction in an extruded magnesium - long-period-stacking-order phase alloy comprising three components of microstructure. The variation of internal strains and intensities of the important crystallographic planes of the two phases has been examined during compression at several temperatures. The long-period-stacking-order phase remains elastic to stresses beyond the macroscopic yield stress while deformation in the magnesium matrix is dominated by twinning and basal slip, with the coarse-grained regions deforming plastically at stresses well below the macroscopic yield stress while regions with fine grain size deform plastically only at much higher stresses.We would like to acknowledge financial support of the Spanish Ministry of Education and Science under project number MAT2012-34135. We would like to acknowledge the expert support of Miguel Acedo and Edurne Laurin for assistance with the extrusion processing and the metallographical preparation, respectively.Peer Reviewe

Mantenimiento de equipos. Apéndice 1

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Materiales intermetálicos para aplicaciones estructurales a altas temperaturas

La investigación en el campo de los materiales intermetálicos ha recibido un fuerte impulso a partir de los años 80 debido principalmente a las demandas por parte del sector aeronáutico, de materiales resistentes, tenaces y dúctiles a elevadas temperaturas que puedan sustituir a las superaleaciones.En este trabajo se analizan las propiedades más características de estos compuestos tales como la estructura ordenada, los elevados valores de límite elástico y resistencia a rotura,que mantienen hasta temperaturas elevadas. etc.Peer reviewe

Curso de Metrologia dimensional para la Fábrica Nacional de Moneda y Timbre

72 diapositivas.-- Curso enmarcado en el Programa: Microscopia Electrónica de Barrido y de Transmisión.Peer reviewe

Aplicaciones del MEB y de la MSE en metalurgia

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