| dc.date | 2015 | |
| dc.date | 2016-06-03T20:15:27Z | |
| dc.date | 2016-06-03T20:15:27Z | |
| dc.date.accessioned | 2018-03-29T01:34:06Z | |
| dc.date.available | 2018-03-29T01:34:06Z | |
| dc.identifier | | |
| dc.identifier | Revista Materia. Universidade Federal Do Rio De Janeiro, v. 20, n. 4, p. 1 - 16, 2015. | |
| dc.identifier | 15177076 | |
| dc.identifier | 10.1590/S1517-707620150004.0103 | |
| dc.identifier | http://www.scopus.com/inward/record.url?eid=2-s2.0-84951929353&partnerID=40&md5=6b55dcdb054023e1f4f09cde99f3dbfa | |
| dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/238422 | |
| dc.identifier | 2-s2.0-84951929353 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1305083 | |
| dc.description | Al-Cu alloys are used in several industrial applications, such as automotive and aerospace manufacturing, which demand mechanical strength and toughness performances. The Al-Cu-Ag ternary alloy system has been investigated to obtain a better understanding on ternary eutectic alloys besides its inherent applications. However, studies concerning the effects on microstructure and hardness due to Ag addition on Al-Cu alloys solidified under transient conditions, are not found in literature. In this sense, the main objective of this work consists in investigating the solidification parameters such as growth (VL) and cooling (Ṫ) rate, microstructure and microhardness regarding the effects of adding 4wt% Ag on a Al-4wt%Cu alloy unidirectionally solidified vertically upwards under unsteady-state solidification conditions. Experimental growth laws correlating the primary (λ1) and secondary (λ2) dendritic spacings with growth and cooling rate are proposed for Al-4wt%Cu and Al-4wt%Cu-4wt%Ag alloys. X-Ray Diffraction (XRD) analyses were performed in order to determine the crystalline phases of the compounds present in the alloys microstructure. The diffractogram of the binary alloy showed the presence of θ-Al2Cu, Al-Cu, Al4Cu9 and Al6Fe intermetallics and, for the case of the ternary alloy, the μ-Ag3Al intermetallic was detected. Chemical compositions at the boundary regions of the dendrite as also inside the dendrite were obtained using scanning electron microscope (SEM) connected to an Energy-Dispersive Spectrometer (EDS) system. Several positions along the ingot were analyzed through the X-Ray Fluorescence (XRF) technique permitting the detection of macrosegregation occurrence. It is shown that the microhardness is not influenced by both spacing patterns of the Al-rich matrix. The ρ-Ag2Al and μ-Ag3Al intermetallics are responsible for the increase in hardness due to the interaction with ternary dendrite arm spacing and other intermetallics. © 2015, Universidade Federal do Rio de Janeiro. All rights reserved. | |
| dc.description | 20 | |
| dc.description | 4 | |
| dc.description | 1 | |
| dc.description | 16 | |
| dc.description | D'elia, F., Ravindran, C., Sediako, D., Solidification analysis of Al-5 wt-%Cu alloy using in situ neutron diffraction (2015) Canadian Metallurgical Quarterly, 54 (1), pp. 9-15. , Jan | |
| dc.description | Totten, G.E., Mackenzie, D.S., (2003) Handbook of aluminum: Physical metallurgy and processes, 1. , New York, Marcel Dekker, Inc | |
| dc.description | Spinelli, J.E., Rosa, D.M., Ferreira, I.L., Influence of melt convection on dendritic spacings of downward unsteady-state directionally solidified Al-Cu alloys (2004) Materials Science and Engineering A, 383, pp. 271-282. , Oct | |
| dc.description | Horita, Z., Ohashi, K., Fujita, T., Achieving high strength and high ductility in precipitation-hardened alloys (2005) Advanced Materials, 17, pp. 1599-1602. , Jul | |
| dc.description | Hutchinson, C.R., Fan, X., Pennycook, S.J., On the origin of the high coarsening resistance of Ω plates in Al-Cu-Mg-Ag alloys (2001) Acta Materialia, 49, pp. 2827-2841. , Aug | |
| dc.description | Brillo, J., Plevachuk, Y., Egry, I., Surface tension of liquid Al-Cu-Ag ternary alloys (2010) Journal of Materials Science, 45, pp. 5150-5157. , Oct | |
| dc.description | Bouchard, D., Kirkaldy, J.S., Prediction of dendrite arm spacings in unsteady-and steady-state heat flow of unidirectionally solidified binary alloys (1997) Metallurgical and Materials Transactions B, 28 B, pp. 651-663. , Aug | |
| dc.description | Garcia, A., (2007) Solidificação: Fundamentos e aplicações, , 2 ed., Campinas, Editora da Unicamp | |
| dc.description | Cruz, K.A.S., Cheung, N., Garcia, A., Parâmetros térmicos, macroestrutura e microestrutura na solidificação direcional da liga Al-20%Sn (2008) Tecnologia em Metalurgia e Materiais, 4 (4), pp. 21-26. , Abr | |
| dc.description | Reis, B.P., França, R.P., Spim, J.A., The effects of dendritic arm spacing (as-cast) and aging time (solution heat-treated) of Al-Cu alloy on hardness (2013) Journal of Alloys and Compounds, 549, pp. 324-335. , Feb | |
| dc.description | Hunt, J.D., Lu, S.Z., Numerical modeling of cellular/dendritic array growth: Spacing and structure predictions (1996) Metallurgical and Materials Transactions A, 27 A, pp. 611-623. , Mar | |
| dc.description | Çadirli, E., Effect of solidification parameters on mechanical properties of directionally solidified Al-rich Al-Cu alloys (2013) Metals and Materials International, 19 (3), pp. 411-422. , May | |
| dc.description | Böyük, U., Maraşli, N., Çadirli, E., Variations of microhardness with solidification parameters and electrical resistivity with temperature for Al-Cu-Ag eutectic alloy (2012) Current Applied Physics, 12, pp. 7-10. , Jan | |
| dc.description | (2008) THERMO-CALC Software, , Version 4, Stockolm, Thermo-Calc Inc., 1 CD-ROM | |
| dc.description | Piwonka, T.S., Woodburry, K.A., Wiest, J.M., Modeling casting dimensions: Effect of wax rheology and interfacial heat transfer (2000) Materials and Design, 21, pp. 365-372. , Aug | |
| dc.description | Gündüz, M., Çadirli, E., Directional solidification of aluminium-copper alloys (2002) Materials Science and Engineering A, 327, pp. 167-185. , Apr | |
| dc.description | Spinelli, J.E., Cheung, N., Garcia, A., On array models theoretical predictions versus measurements for the growth of cells and dendrites in the transient solidification of binary alloys (2011) Philosophical Magazine, 91 (12), pp. 1705-1723. , Apr | |
| dc.description | Carvalho, D.L.B., Costa, T.A.P.S., Moreira, A.L.S., Solidification thermal parameters and dendritic growth during the horizontal directional solidification of Al-7wt.%Si alloy (2014) Revista Escola de Minas, 67 (3), pp. 265-270. , Jul | |
| dc.description | Vasconcelos, A.J., Silva, C.V.A., Moreira, A.L.S., Influence of thermal parameters on the dendritic arm spacing and the microhardness of Al-5.5wt.%Sn alloy directionally solidified (2014) Revista Escola de Minas, 67 (2), pp. 173-179. , Apr | |
| dc.description | Canté, M.V., Spinelli, J.E., Ferreira, I.L., Microstructural development in Al-Ni alloys directionally solidified under unsteady-state conditions (2008) Metallurgical and Materials Transactions A, 39 A, pp. 1712-1726. , Jul | |
| dc.description | Castanho, M.A.P., Goulart, P.R., Brito, C., Steady and unsteady state peritectic solidification (2015) Materials Science and Technology, 31 (1), pp. 105-114. , Jan | |
| dc.description | Souza, E.N., Cheung, N., Garcia, A., The correlation between thermal variables and secondary dendrite arm spacing during solidification of horizontal cylinders of Sn-Pb alloys (2005) Journal of Alloys and Compounds, 399, pp. 110-117. , Aug | |
| dc.description | Bertelli, F., Brito, C., Ferreira, I.L., Cooling thermal parameters, microstructure, segregation and hardness in directionally solidified Al-Sn-(Si;Cu) alloys (2015) Materials and Design, 72, pp. 31-42. , Feb | |
| dc.description | Goulart, P.R., Spinelli, J.E., Cheung, N., The effects of cell spacing and distribution of intermetallic fibers on the mechanical properties of hypoeutectic Al-Fe alloys (2010) Materials Chemistry and Physics, 119, pp. 272-278. , Jan | |
| dc.description | Callister, W.D., Jr., Rethwisch, D.G., (2012) Ciência e engenharia de materiais: Uma introdução, , 8 ed., Rio de Janeiro, Editora LTC | |
| dc.description | Kaya, H., Çadirli, E., Böyük, U., Variation of microindentation hardness with solidification and microstructure parameters in the Al based alloys (2008) Applied Surface Science, 255, pp. 3071-3078. , Dec | |
| dc.description | | |
| dc.description | | |
| dc.language | pt | |
| dc.publisher | Universidade Federal do Rio de Janeiro | |
| dc.relation | Revista Materia | |
| dc.rights | fechado | |
| dc.source | Scopus | |
| dc.title | Influence On Microstructure And Hardness Resulting From The Addition Of 4% Ag In The Alloy Al-4% Cu Solidified Unidirectionally [influência Na Microestrutura E Na Microdureza Decorrente Da Adição De 4%ag Na Liga Al-4%cu Solidificada Unidirecionalmente] | |
| dc.type | Artículos de revistas | |
