Microstructure and microhardness in horizontally solidified Al–7Si–0.15Fe–(3Cu; 0.3Mg) alloys

Souza, Fabrício; Lima, J. O.; Rizziolli, C.; Magno, Igor A.; Barros, André; Moreira, Antonio Luciano Seabra; Rocha, Otávio Fernandes Lima da

doi:10.1080/02670836.2018.1444923

Cited by 10 publications

(12 citation statements)

References 51 publications

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“…It is observed that higher HV values were obtained in the interdendritic regions, in which Si + π + θ particles of high hardness are present. Vasconcelos et al 48 , Araújo et al 28 and Souza et al 40 have found higher HV values for Al-Si multicomponent alloys with addition of Cu and Mg and the authors have attributed to the presence of intermetallic phases (Al 2 Cu and Mg 2 Si) of high hardness in the interdendritic region of the as-solidified samples. In contrast to the procedure adopted in the present study, these authors did not perform HV measurements in the Al-rich and eutectic phases, the HV values reported by them were the means of 20 measurements obtained directly in the casting samples.…”

Section: Resultsmentioning

confidence: 96%

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

et al. 2018

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An experimental study with an A356-AlSiMgFe alloy was developed to evaluate the microhardness performance in the microstructure resulting of an unsteady-state horizontal solidification process. The Al-7wt%Si-0.3wt%Mg-0.15wt%Fe alloy was elaborated and directionally solidified in a water-cooled horizontal solidification device. In order to experimentally determine the cooling and growth rates (V L and T R , respectively), a thermal analysis was also conducted during solidification. Microstructural characterization by optical microscopy, SEM/EDS elemental mapping and microanalysis of the punctual EDS compositions allowed to observe the presence of an Al-rich dendritic phase (Al (α)) with interdendritic phases second composed of an eutectic mixture: Al (α-eutectic) + Si + Al 8 Mg 3 FeSi 6(π) + Mg 2 Si (θ). Furthermore, the dendritic microstructure was characterized by measuring the secondary dendritic spacings (λ 2) along the horizontally solidified ingot. Higher HV values were observed within the eutectic mixture.

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Section: Resultsmentioning

confidence: 96%

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

et al. 2018

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“…Microstructural scale, phases morphology and heat treatment are conducive to change the properties of automotive AlSiMg alloy separately or in conjunction with each other, to develop desired and optimum properties in the casting. In this regard, a series of works were recently developed with the automotive casting Al7Si0.3Mg (wt.%) alloy, which in a rst stage aimed to analyze the effects of solidi cation conditions on the microstructure and mechanical properties [20][21][22][23]. In this step, the in uence of the thermal solidi cation parameters, such as growth and cooling rates on the length of the dendritic microstructure as well as on the size, distribution and morphology of the Mg 2 Si/Fe intermetallic compounds (ICMs) and, in turn, on the hardness and tensile properties were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…In this step, the in uence of the thermal solidi cation parameters, such as growth and cooling rates on the length of the dendritic microstructure as well as on the size, distribution and morphology of the Mg 2 Si/Fe intermetallic compounds (ICMs) and, in turn, on the hardness and tensile properties were investigated. In a second stage [6, 19,24], T6 heat treatment under different conditions has been applied to the as-cast samples resulting from the work of References [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…From the as-cast samples obtained by Lima et al [21], Souza et al [22] and Barbosa et al [23], analyzes on the in uence of the solidi cation parameters on the microhardness (HV) of the aforementioned alloy have been performed. In addition, Souza et al [22] evaluated the Mg and Cu addition in the Al-7Si alloy (wt.%), depicted higher HV values for the ternary Al-7Si-(0.3Mg;3Cu) alloys (wt.%), while Barbosa et al [23] noted higher HV values on ICMs and Si crystals in relation to the Al-rich primary phase (Al α ).…”

Section: Introductionmentioning

confidence: 99%

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Solidification and Heat-treatment Conditions Affecting the Tensile Properties and Fracture Feature of an Automotive AlSiMg Alloy

Barbosa

Azevedo

Costa

et al. 2023

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In this work, a study on the interrelationship between the solidi cation and heat-treatment processes parameters with tensile properties and fracture feature was performed with an automotive AlSiMg alloy. For that, samples of the horizontally solidi ed Al7Si0.3Mg (wt.%) alloy were subjected to the T6-heat treatment as well as tensile tests were performed on both investigated samples, under conditions established from the literature. The solidi cation conditions such as growth and cooling rates and the secondary dendritic spacing (V L and T R and λ 2 , respectively) and their effects on the ultimate tensile strength (σ UTS ) and elongation (E%) were evaluated. It was observed higher σ UTS values in the heat-treated samples and ner microstructures have inherited a better E% performance. Analysis by SEM/EDS fractography on both samples showed a mix between brittle and ductile fractures, constituted by cleavage facets, secondary cracks, facets covered with micro-voids, tear ridges and dimples. It has allowed deducing on the occurrence of a transition from ductile to brittle fracture along the solidi ed ingot as well as the predominance of brittle fracture in the heat-treated samples.

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“…Portanto, uma interessante característica adicional do sistema horizontal é o gradiente de concentração de soluto bem como os efeitos de densidade na direção vertical, uma vez que o líquido enriquecido de soluto, dependendo de sua densidade, pode decantar ou não, ao passo que o solvente tende a emergir devido as forças de flutuabilidade. Além disso, devido os efeitos impostos pela convecção termossolutal, sempre vai ocorrer um gradiente de temperaturas na direção vertical [14,[29][30][31][32][33]. Na literatura, observa-se que a grande maioria dos estudos desenvolvidos dedicam-se a investigar a formação de estruturas dendríticas obtidas durante a solidificação unidirecional de materiais metálicos somente nos sistemas verticais considerando o regime estacionário de extração de calor.…”

Section: Introductionunclassified

Liga hipoeutética Al-11%Si: coeficiente de transferência de calor interfacial, variáveis térmicas, parâmetros microestruturais e microdureza

Rodrigues¹,

Júnior²,

Barros³

et al. 2021

Matéria (Rio J.)

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RESUMO Este artigo apresenta um estudo teórico-experimental com o objetivo de determinar o coeficiente de transferência de calor interfacial, as variáveis térmicas de solidificação, os espaçamentos dendríticos primários e secundários bem como a microdureza Vickers da liga Al-11%Si solidificada direcionalmente, sob condições transientes de fluxo de calor, em um dispositivo de configuração horizontal refrigerado a água. Para o monitoramento dos perfis de temperatura utilizou-se um conjunto de termopares tipo K localizados em diferentes posições a partir da interface metal-molde, considerando a linha central correspondente ao eixo longitudinal do lingote. Uma técnica numérica, que compara perfis térmicos teóricos e experimentais, foi utilizada no cálculo do coeficiente de transferência de calor na interface metal/molde durante a solidificação cuja condição transiente é representada por uma equação analítica na forma de potência. Foram aplicadas técnicas experimentais para o cálculo das variáveis térmicas de solidificação, ou seja, deslocamento da frente de solidificação, velocidade da isoterma liquidus e taxa de resfriamento. Os resultados experimentais e simulados apresentaram uma concordância muito boa e possibilitaram estabelecer correlações analíticas entre tais variáveis térmicas e os espaçamentos dendríticos primários e secundários obtidos, por meio de equações na forma de potência representadas por expoentes característicos. Finalmente, são também apresentadas expressões experimentais capazes de correlacionar os valores dos espaçamentos dendríticos estudados com o comportamento da microdureza Vickers da referida liga.

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Microstructure and microhardness in horizontally solidified Al–7Si–0.15Fe–(3Cu; 0.3Mg) alloys

Cited by 10 publications

References 51 publications

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

Solidification and Heat-treatment Conditions Affecting the Tensile Properties and Fracture Feature of an Automotive AlSiMg Alloy

Liga hipoeutética Al-11%Si: coeficiente de transferência de calor interfacial, variáveis térmicas, parâmetros microestruturais e microdureza

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