%0 Journal Article
%T Trasformaci車n microestructural in situ y su correlaci車n con la resistividad el谷ctrica en la aleaci車n de aluminio AA-6061 Microstructural transformation in situ and its correlation with the electrical resistivity in aluminiun alloy A-6061
%A Jos谷 Luis Ochoa
%A Gema Gonz芍lez
%A Lisbeth Lozada
%J Revista Latinoamericana de Metalurgia y Materiales
%D 2012
%I Universidad Sim車n Bol赤var
%X En el presente trabajo se realiz車 el estudio comparativo entre la variaci車n de la resistividad el谷ctrica en funci車n de la temperatura din芍mica con las transformaciones de fase observadas mediante experimentos de envejecimientos ※in situ§ en el microscopio electr車nico de transmisi車n, en aluminio AA-6061. Las im芍genes obtenidas permiten apreciar el crecimiento de los precipitados. Para envejecimientos isot谷rmicos entre 200 y 350∼C se aprecia la formaci車n de las fases 汕∩∩, 汕∩, y a temperaturas m芍s altas la ulterior transformaci車n a la fase 汕, para posteriormente la redisoluci車n de fases a temperaturas superiores a 450∼C. Particularmente las fases metaestables 汕∩∩ y 汕∩ alcanzan sus m芍ximos tama os entre, aproximadamente, 220 y 350∼C. En otro tipo de experimento se midi車 la resistividad el谷ctrica, observ芍ndose que las variaciones experimentadas por 谷sta est芍n directamente asociadas con las transformaciones de fase, y son fuertemente influenciadas por la presencia de las fases 汕∩∩ y 汕∩. In the present work, a comparative study between the variation of electrical resistivity as a function of the dynamic temperature and the phase transformations observed in the aluminium AA-6061 alloy was carried out, during ※in situ§ TEM aging. By this method, it was possible observe the growth of precipitates. For isothermal aging between 200 y 350∼C the formation of the phases 汕∩∩ and 汕∩ was observed. At higher temperatures, the subsequent transformation to 汕 phase, and the redissolution of phases at temperatures above 450∼C was also observed. Particularly, the metastable phases 汕∩∩ and 汕∩ reached their maximum size between 220 and 350∼C. In another type of experiment, the electrical resistivity measured up, being observed that the variations shown by this parameter were directly associated with the phase transformations, and they were also strongly influenced by the presence of the phases 汕∩∩ and 汕∩.
%K AA-6061
%K Resistividad El谷ctrica
%K Precipitaci車n
%K Transformaci車n in situ
%K AA-6061
%K Electrical Resistivity
%K Precipitation
%K Transformation in situ
%U http://wwww.scielo.org.ve/scielo.php?script=sci_arttext&pid=S0255-69522012000200004