Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12104/42389
Title: Paleomagnetism of the Pleistocene Tequila volcanic field (Western Mexico)
Author: Alemon, B.
Flores, M.
Canto, C.
Andrade, E.
De Lucio, O.G.
Rocha, M.F.
Broitman, E.
Issue Date: 2014
Abstract: A novel TiAlCN/CNx multilayer coating, consisting of nine TiAlCN/CNx periods with a top layer 0.5 ?m of CNx, was designed to enhance the corrosion resistance of CoCrMo biomedical alloy. The multilayers were deposited by dc and RF reactive magnetron sputtering from Ti0.5Al0.5 and C targets respectively in a N 2/Ar plasma. The corrosion resistance and mechanical properties of the multilayer coatings were analyzed and compared to CoCrMo bulk alloy. Ion beam analysis (IBA) and X-ray diffraction tests were used to measure the element composition profiles and crystalline structure of the films. Corrosion resistance was evaluated by means of potentiodynamic polarization measurements using simulated body fluid (SBF) at typical body temperature and the nanomechanical properties of the multilayer evaluated by nanoindentation tests were analyzed and compared to CoCrMo bulk alloy. It was found that the multilayer hardness and the elastic recovery are higher than the substrate of CoCrMo. Furthermore the coated substrate shows a better general corrosion resistance than that of the CoCrMo alloy alone with no observation of pitting corrosion. " 2014 Elsevier B.V. All rights reserved.",,,,,,"10.1016/j.nimb.2013.12.040",,,"http://hdl.handle.net/20.500.12104/42389","http://www.scopus.com/inward/record.url?eid=2-s2.0-84902545944&partnerID=40&md5=f07b470207fbbea31c9cd55a2f0979e3",,,,,,,,"Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",,"134
139",,"331",,"Scopus
WOS",,,,,,"Corrosion; Ion beam analysis; Nanoindentation",,,,,,"Ion beam analysis, corrosion resistance and nanomechanical properties of TiAlCN/CNx multilayer grown by reactive magnetron sputtering",,"Article" "45249","123456789/35008",,"Ceja, M.R., Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico; Goguitchaichvili, A., Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico, Laboratorio Interinstitucional de Magnetismo Natural, Instituto de Geofísica, Universidad Nacional Autónoma de México, Coeneo, Michoacán, Mexico, Departamento de Geología y Mineralogía, Universidad Michoacana San Nicolás de Hidalgo, Morelia-Michoacan, Mexico; Calvo-Rathert, M., Dpto. de Física, E. P. S., Universidad de Burgos, Av. Cantabria, s/n, Burgos, Spain; Morales-Contreras, J., Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico; Alva-Valdivia, L., Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico; Elguera, J.R., Centro de Ciencias de la Tierra, Universidad de Guadalajara, 44840 Guadalajara, Mexico; Urrutia-Fucugauchi, J., Laboratorio de Paleomagnetismo, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico; Granados, H.D., Departamento de Vulcanología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n, 04510 Mexico D.F., Mexico",,"Ceja, M.R.
Goguitchaichvili, A.
Calvo-Rathert, M.
Morales-Contreras, J.
Alva-Valdivia, L.
Elguera, J.R.
Urrutia-Fucugauchi, J.
Granados, H.D.",,"2006",,"This paper presents new paleomagnetic results from 24 independent cooling units in Tequila area (western Trans-Mexican Volcanic Belt). These units were recently dated by means of state-of-the-art 40Ar-39Ar method (Lewis-Kenedy et al., 2005) and span from 1130 to 150 ka. The characteristic paleodirections are successfully isolated for 20 cooling units. The mean paleodirection, discarding intermediate polarity sites, is 1 = 29.6 , D = 359.2 , k = 26, ?95 = 7.1 , n = 17, which corresponds to the mean paleomagnetic pole position Plat = 85.8 , Plong = 84.3 , K = 27.5, A95 = 6.9 . These directions are practically undistinguishable from the expected Plestocene paleodirections, as derived from reference poles for the North American polar wander curve and in agreement with previously reported directions from western Trans-Mexican Volcanic Belt. This suggests that no major tectonic deformation occurred in studied area since early-middle Plestocene to present. The paleosecular variation is estimated trough the study of the scatter of virtual geomagnetic poles giving SF = 15.4 with SU = 19.9 and SL = 12.5 (upper and lower limits respectively). These values are consistent with those predicted by the latitude-dependent variation model of McFadden et al. (1991) for the last 5 Myr. The interesting feature of the paleomagnetic record obtained here is the occurrence of an intermediate polarity at 671 13 ka which may correspond the worldwide observed Delta excursion at about 680-690 ka. This gives the volcanic evidence of this event. Two independent lava flows dated as 362 13 and 354 5 ka respectively, yield transitional paleodirections as well, probably corresponding to the Levantine excursion. Copyright " The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.
URI: http://hdl.handle.net/20.500.12104/43470
http://www.scopus.com/inward/record.url?eid=2-s2.0-33846111783&partnerID=40&md5=e5772f127690b153104cd822a48164a1
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