Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys
Ternary Al-11wt %Si-(xwt %)Cu alloys are highly recommended as commercial filler metals for aluminum brazing alloys. However, very little is known about the functional inter-relations controlling the solidified microstructures characterizing processes such as torch and furnace brazing. As such, we e...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-09-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2075-4701/8/10/784 |
| _version_ | 1818535749694259200 |
|---|---|
| author | Bruno Monti Carmelo Donadoni Leonardo Fernandes Gomes Amauri Garcia José Eduardo Spinelli |
| author_facet | Bruno Monti Carmelo Donadoni Leonardo Fernandes Gomes Amauri Garcia José Eduardo Spinelli |
| author_sort | Bruno Monti Carmelo Donadoni |
| collection | DOAJ |
| description | Ternary Al-11wt %Si-(xwt %)Cu alloys are highly recommended as commercial filler metals for aluminum brazing alloys. However, very little is known about the functional inter-relations controlling the solidified microstructures characterizing processes such as torch and furnace brazing. As such, we evaluated two commercial brazing alloys, which are the Al-11wt %Si-3.0wt %Cu and Al-11wt %Si-4.5wt %Cu alloys: Cu contents typically trend in between the suitable alloying spectrum. We analyzed the effects of solidification kinetics over features such as the dendrite arm spacing and the spacing between particles constituting the eutectic mixture. Also, tensile properties were determined as a function of the dendrite microstructure dimensions. The parameters concerned for translating the solidification kinetics were either the cooling rate, or growth velocity related to the displacement of the dendrite tip, or the eutectic front. The relevant scaling laws representing the growth of these brazing alloys are outlined. The experimental results demonstrated that a 50% increase in Cu alloying (from 3.0 to 4.5 wt %) could be operated in order to obtain significant variations in the dendritic length-scale of the microstructure across the produced parts. Overall, the microstructures were constituted by an α-Al dendritic matrix surrounded by a ternary eutectic consisting of α-Al + Al2Cu + Si. The scale measurements committed to the Al2Cu eutectic phase pointed out that the increase in Cu alloying has a critical role on refining the ternary eutectic. |
| first_indexed | 2024-12-11T18:29:04Z |
| format | Article |
| id | doaj.art-b38c4df01d5d420a9ccd3a2bf9a0b324 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-11T18:29:04Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-b38c4df01d5d420a9ccd3a2bf9a0b3242022-12-22T00:54:58ZengMDPI AGMetals2075-47012018-09-0181078410.3390/met8100784met8100784Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing AlloysBruno Monti Carmelo Donadoni0Leonardo Fernandes Gomes1Amauri Garcia2José Eduardo Spinelli3Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, BrazilDepartment of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, BrazilDepartment of Manufacturing and Materials Engineering, University of Campinas—UNICAMP, Campinas, SP 13083-860, BrazilDepartment of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, BrazilTernary Al-11wt %Si-(xwt %)Cu alloys are highly recommended as commercial filler metals for aluminum brazing alloys. However, very little is known about the functional inter-relations controlling the solidified microstructures characterizing processes such as torch and furnace brazing. As such, we evaluated two commercial brazing alloys, which are the Al-11wt %Si-3.0wt %Cu and Al-11wt %Si-4.5wt %Cu alloys: Cu contents typically trend in between the suitable alloying spectrum. We analyzed the effects of solidification kinetics over features such as the dendrite arm spacing and the spacing between particles constituting the eutectic mixture. Also, tensile properties were determined as a function of the dendrite microstructure dimensions. The parameters concerned for translating the solidification kinetics were either the cooling rate, or growth velocity related to the displacement of the dendrite tip, or the eutectic front. The relevant scaling laws representing the growth of these brazing alloys are outlined. The experimental results demonstrated that a 50% increase in Cu alloying (from 3.0 to 4.5 wt %) could be operated in order to obtain significant variations in the dendritic length-scale of the microstructure across the produced parts. Overall, the microstructures were constituted by an α-Al dendritic matrix surrounded by a ternary eutectic consisting of α-Al + Al2Cu + Si. The scale measurements committed to the Al2Cu eutectic phase pointed out that the increase in Cu alloying has a critical role on refining the ternary eutectic.http://www.mdpi.com/2075-4701/8/10/784Al alloysmechanical propertiesmicrostructurebrazingsolidification |
| spellingShingle | Bruno Monti Carmelo Donadoni Leonardo Fernandes Gomes Amauri Garcia José Eduardo Spinelli Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys Metals Al alloys mechanical properties microstructure brazing solidification |
| title | Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys |
| title_full | Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys |
| title_fullStr | Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys |
| title_full_unstemmed | Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys |
| title_short | Tailoring of Microstructures and Tensile Properties in the Solidification of Al-11Si(-xCu) Brazing Alloys |
| title_sort | tailoring of microstructures and tensile properties in the solidification of al 11si xcu brazing alloys |
| topic | Al alloys mechanical properties microstructure brazing solidification |
| url | http://www.mdpi.com/2075-4701/8/10/784 |
| work_keys_str_mv | AT brunomonticarmelodonadoni tailoringofmicrostructuresandtensilepropertiesinthesolidificationofal11sixcubrazingalloys AT leonardofernandesgomes tailoringofmicrostructuresandtensilepropertiesinthesolidificationofal11sixcubrazingalloys AT amaurigarcia tailoringofmicrostructuresandtensilepropertiesinthesolidificationofal11sixcubrazingalloys AT joseeduardospinelli tailoringofmicrostructuresandtensilepropertiesinthesolidificationofal11sixcubrazingalloys |