Tailoring the Mechanical Properties of Al-Sn-Alloys for Tribological Applications

Schouwenaars, Rafael; Torres, Jorge; Jacobo, Víctor H.; Ortíz, A.

doi:10.4028/www.scientific.net/msf.539-543.317

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…The microstructural evolution of Al-Sn alloys during annealing above the melting temperature of Sn is definitely more complex than suggested by the simple microstructural observations used in earlier works [1,3,4]. Few studies have been dedicated to the study of recrystallisation in alloys with a contiguous second phase [11] and even less data are available on recrystallisation and grain growth in the presence of a liquid phase [17,18].…”

Section: Discussionmentioning

confidence: 98%

“…Recent results [2] have shown that the retention of elongated Sn-ribbons has a detrimental effect on wear properties, as these ribbons are the site for subsurface crack nucleation. Earlier work [3,4] has focused mainly on the optimisation of mechanical properties by cold working and annealing; microstructure, beyond the aspect of redistribution of Sn, has not been studied into detail, due to the problem that most observations of cold-rolled an partially recrystallised Al-alloys rely on electrochemical surface etching, which is difficult for the present products due to the significant difference in electrochemical behaviour of the constituent phases. This paper is the first work in open literature to report texture measurement on Al-Sn alloys.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Texture and Recrystallisation Mechanisms of an Al-20%Sn Deformation Processed Metal-Metal Composite

Schouwenaars

Durán

Jacobo

et al. 2012

MSF

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Al-Sn alloys for tribological applications are industrially important alloys which have attracted little attention over their history. Being cold rolled directly from thin cast slabs and consisting of two ductile phases, their processing and physical behaviour are distinct from classical Al-Alloys. During cold rolling, the coarse-grained, random texture of the slab is transformed into the classical rolling texture of a fine-grained Al-alloy, with elongated Al-grains delimited by thin Sn-ribbons. During annealing at 300°C, the interior of the Al-grains recrystallises rapidly while the liquid Sn-phase migrates toward Al-grain triple lines to form a reticular structure. A weak texture, dominated by Goss and P is produced. Grain growth within the original cold-rolled grains is fast, but once the recrystallised grain size reaches the length scale of the second-phase distribution, it slows down and both phases coarsen simultaneously, accompanied by a significant texture change.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Microstructure, Texture and Recrystallisation Mechanisms of an Al-20%Sn Deformation Processed Metal-Metal Composite

Schouwenaars

Durán

Jacobo

et al. 2012

MSF

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“…Durante o resfriamento da liga formada, os elementos de liga adicionados podem ser retidos na solução sólida substitucional ou precipitados na forma de segunda fase. Distorções provocadas por esses elementos em solução sólida ou na forma de precipitados finos, com interface coerente/semicoerente com a matriz, criam tensões que favorecem o aumento do perfil de endurecimento da liga, sendo este um dos principais objetivos dessas adições [3][4][5][6]. O Si, quando adicionado em teores mais elevados, além de proporcionar o endurecimento por solução sólida da matriz Al também aumenta a fluidez do Al fundido, favorecendo o melhor preenchimento da matriz e reduz a ocorrência de trincas a quente.…”

Section: Introductionunclassified

“…A fase rica em Sn funde em temperaturas muito baixas (na faixa de 227,7ºC) e caso as buchas e rolamentos sejam superaquecidas durante o trabalho, esse elemento pode se liquefazer atuando como um lubrificante. Ligas quaternárias de Al-Si-Cu-Sn podem ser endurecidas por precipitação e são facilmente tratadas termicamente [4,5,7,8,9,10]. A realização de tratamentos térmicos em ligas de alumínio simplesmente fundidas permite modificar as propriedades mecânicas.…”

Section: Introductionunclassified

SOLUBILIZAÇÃO E ENDURECIMENTO POR PRECIPITAÇÃO EM LIGAS QUATERNÁRIAS DE Al-Si-Cu-Sn *

Nunes¹,

Pelegrini²,

Balthazar³

et al. 2019

ABM Proceedings

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Resumo Tratamentos térmicos de solubilização seguido de envelhecimento têm por finalidade elevar as propriedades mecânicas, em termos de resistência mecânica, das ligas de alumínio através da precipitação controlada. Este trabalho objetivou estudar a relação de duas composições químicas de ligas quaternárias de alumínio submetidas a diferentes condições de tratamentos térmicos de solubilização e envelhecimento artificial. A sequência de tratamentos térmicos aplicados consistiu em: solubilização em dois estágios sendo o primeiro realizado por 5 h e o segundo pelos tempos de 5 h, 6 h, 7 h e 8 h, ambos na temperatura de encharque de 520 ºC ± 10 ºC com resfriamento em água a 20 ºC e envelhecimento na temperatura de 160 ºC para os tempos de 2 h, 4 h, 8 h, 12 h, 18 h e 24 h. Através da análise dos resultados observou-se que as amostras da liga com maior fração de silício apresentaram o maior perfil de endurecimento para o tempo de envelhecimento de 4 h. Enquanto a outra liga apresentou constância no perfil de endurecimento para os tempos de envelhecimento de 8 h e 12 h. Palavras-chave: Ligas de Alumínio; Endurecimento por precipitação; Microestrutura. SOLUTION AND PRECIPITATION HARDENING OF QUATERNARY ALLOYS OF Al-Si-Cu-Sn Abstract Solution heat treatment followed by ageing aim to elevate the mechanical properties in terms of mechanical strength of aluminum alloys by controlled precipitation. This work aimed to study the relationship of two chemical compositions of aluminum quaternary alloys subjected to different conditions of solution heat treatments and artificial ageing. The heat treatments applied consisted of: solution in two stages, the first being directed by 5 h and the second by 5 h, 6 h, 7 h and 8 h, both at the soaking temperature 520 ºC ± 10 ºC with cooling in water at 20 ºC and ageing at 160 ºC for 2 h, 4 h, 8 h, 12 h, 18 h and 24 h. Through the analysis of the results was observed that the samples of the alloy with a higher fraction of silicon showed the greatest hardening profile for ageing for 4 h. While the other alloy presented constancy in the hardening profile for ageing for 8 h and 12 h.

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“…Due to their good antifriction properties [1][2][3] and improvement of mechanical properties with additional alloying elements [4], engineering applications of the Al-Sn alloys have been increased. These alloys are usually related to plain bearing materials, internal combustion engine pistons, cylinder liners [1,3,5] and also as advanced lead-free materials [6].…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of the Al-Sn-Cu Bearing Alloy under Different Cold Rolling Conditions

Nassar¹,

Taha²,

Labeeb³

et al. 2015

JMSE-B

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This study was focused on the investigation of the effect of cold rolling reduction mechanism at rates of 24%, 40%, 56% and 72% on the structure, microhardness (Hv), TEC (Thermal expansion coefficient) and electrical resistivity of the Al-20wt.%Sn-1wt.%Cu bearing alloy. The results showed that the structure and properties of the Al-Sn-Cu alloy have been strongly affected by the cold rolling mechanism. The crystallite size of Al-matrix decreased continuously with increasing cold rolling reduction till 56% then slightly increased at 72% reduction. Microhardness of the alloy increased continually with cold rolling deformation till 56% due to strain hardening followed by a reduction at 72% due to the natural softening. The TEC curves of the cold rolled samples showed the lowest TEC obtained for 56% cold rolling reduction at 230 º C. Electrical resistivity increased continuously with increasing cold rolling reduction.

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Tailoring the Mechanical Properties of Al-Sn-Alloys for Tribological Applications

Cited by 12 publications

References 15 publications

Microstructure, Texture and Recrystallisation Mechanisms of an Al-20%Sn Deformation Processed Metal-Metal Composite

Microstructure, Texture and Recrystallisation Mechanisms of an Al-20%Sn Deformation Processed Metal-Metal Composite

SOLUBILIZAÇÃO E ENDURECIMENTO POR PRECIPITAÇÃO EM LIGAS QUATERNÁRIAS DE Al-Si-Cu-Sn *

Structure and Properties of the Al-Sn-Cu Bearing Alloy under Different Cold Rolling Conditions

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