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Rosario, Argentina

Ciarlo N.C.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano | De Rosa H.,Laboratorio Of Materiales | Elkin D.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano | Svoboda H.,University of Buenos Aires | And 3 more authors.
Historical Metallurgy | Year: 2011

The results of morphological and microstructural examination of an anchor found near the site of the shipwreck (1770) of the British sloop-of-war HMS Swift during the enlargement of Puerto Deseado pier are presented. The following analyses were performed: Microstructural characterization, determination of chemical composition, and microhardness testing. Some aspects of the manufacturing process and the material used were determined. The characteristics of the anchor are consistent with those of 18th-century English anchors. According to these results, the anchor's possible link with the wreck of the Swift is examined. Source


Gargicevich D.,Laboratorio Of Materiales | Gargicevich D.,CONICET | Josa V.M.G.,CONICET | Josa V.M.G.,National University of Cordoba | And 5 more authors.
Journal of Physics: Conference Series | Year: 2015

We studied the crystalline structure of Fe - 8at.%Al - 4at.%Ge alloy between 300 and 1300 K and its relation to the mechanical response by means of neutron diffraction and mechanical spectroscopy. At room temperature we observe a Fe3Al-type ordered structure with a deficiency of Al in the 8c sites. The Ge atoms are distributed in the 4a and Al atoms in 8c sites. At high temperature we observe an order-disorder transformation when the crystal structure becomes Fe-α type. This loss of order gives rise to the hysteresis behavior of damping between the heating and cooling runs. © Published under licence by IOP Publishing Ltd. Source


Burgos R.E.,Laboratorio Of Materiales | Bruera F.A.,Laboratorio Of Materiales | Ares A.E.,Laboratorio Of Materiales | Mendez C.M.,Laboratorio Of Materiales
Revista Materia | Year: 2015

Passivity of the stainless steel is attributed to the development of a protector film, formed by oxides on the metal surface. This film has semiconductor properties, and it is important for the understanding of corrosion phenomena.The objective of this work is to study the passive films formed in stainless steels samples solidified unidirectionally. The composition of the alloying elements in the samples are Fe-18Cr-10Ni-2Mo- 0,08C (sample A), Fe-18Cr-14Ni-8Mo-0,03C (sample C) y Fe-18Cr-10Ni-8Mo-0,08C (sample F), and determine the influence of the structure (equiaxed, columnar and columnar-to-equiaxed transition, CET) in the corrosion resistance, as well as investigate the relationship between the corrosion resistance and the size of the secondary dendritic arm spacing. For this are used potentiodynamic and galvanostatic techniques, Mott Schottky analysis and electrochemical impedance spectroscopy.The measurements were performed in Na2HPO40,5 M (pH = 9,2), at room temperature (25ºC).Potentiodynamic measurements indicate a passive region and a maximum current in the transpassive region. The galvanostatic measurements of the passive films indicate two plain of potential, due to chromium oxide and iron oxide, in which two transition times occur. The greater thickness of the iron oxide is in the equiaxed structures of sample F, which has the smallest dendritic spacing with respect to other two samples, given the same structure. Mott Schottky analysis shows that the passive film behaves as an n-type semiconductor in the potential range of -0.45 V to 0 V, with a density of-donor that varies according to the composition of stainless steel. It is also observed that the density-donor varies according to the type of structure for the same material. © 2015, Universidade Federal do Rio de Janeiro. All rights reserved. Source

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