CHARACTERIZATION OF STRUCTURAL AND THERMAL MULTISLICE CU / MG FLOODS THROUGH EBDAuthor:
GONZALEZ SILVEIRA MARTA.
Year:
2005.
University:
AUTÓNOMA DE BARCELONA [
www.uab.es].
Place of defense: UNIVERSITAT AUTONOMA DE BARCELONA.
Place of preparation: UNIVERSIDAD AUTONOMA DE BARCELONA.
Summary: Systems multilayers are high scientific interest in the field of materials science because of the large number of potential applications that show these systems, including applications in microelectronics, resistive coatings or optoelectronic devices. Depending on the application, the characterization of thermal layers is crucial. In this work we have characterized the different reactions that take place in the system of multi-Cu / Mg to submit the same to various heat treatments. Through different characterization techniques has been obtained that regardless of estequimetría submit layers, the first phase has been formed in the intermetálico CuMg2, while the intermetálico Cu2Mg was formed when the layers have produced a surplus of Cu respect to estequiometría 1 Cu: 2Mg. During heat treatment in which the sample is heated at a constant speed, the training of intermetálico CuMg2 takes place in two distinct stages: firstly nucleation and growth side of this stage along the intercaras, and the increase temperature, growth vertical intermetálico at the expense of the layers of pure Cu and Mg. In addition to this separation between these two modes of growth, there has been a distinct unit of the first phase of transformation with the thickness of the layers. When the layers of Mg exceed a certain thickness, this stage of transformation does not occur simultaneously on both types of intercara. Specifically, the reaction occurs in the first instance on intercaras type Mg on Cu while in intercaras type Cu Mg on the intermetálico appears to higher temperatures. This asymmetry may be related to the microstructure of the layers of Mg. Moreover, the samples have been subjected to hydrogenation treatments, after which it has been observed the formation of hydride Mg. In this work has been qualitatively studied the catalytic effect of intermetálico CuMg2 in the diffusion and absorption of hydrogen by Mg system multilayers.
