Microstructure and properties of high strength aluminium alloys for structural applications

Mukhopadhyay, A. K.

doi:10.1007/s12666-009-0015-z

Cited by 45 publications

(21 citation statements)

References 26 publications

(30 reference statements)

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“…Various researchers have shown that [19][20][21][22] a change in temper condition can change the Cu content along the grain boundary precipitates and adversely affect the intergranular corrosion resistance. RRA alloy has more Cu in the grain boundaries than the PA alloy.…”

Section: Discussionmentioning

confidence: 99%

Influence of Retrogression and Re-aging on the Exfoliation Corrosion Behavior of AA 7085 Sheets

Krishnan¹,

Raja²,

Mukhopadhyay³

2016

Corrosion Science and Technology

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An attempt has been made to understand the influence of retrogression and re-aging (RRA) on the exfoliation corrosion behaviour of AA 7085 alloy in comparison with the peak aged condition (PA). Immersion tests using ASTM G34 and studies involving electrochemical impedance spectroscopy showed that the RRA treated alloy provided higher resistance to exfoliation corrosion than the PA treated alloy. The improved resistance was attributed to the enhanced Cu content and the discontinuous nature of the grain boundary precipitate, which was revealed through transmission electron microscopy.

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Section: Discussionmentioning

confidence: 99%

Influence of Retrogression and Re-aging on the Exfoliation Corrosion Behavior of AA 7085 Sheets

Krishnan¹,

Raja²,

Mukhopadhyay³

2016

Corrosion Science and Technology

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“…The alloy was prepared in an induction furnace under argon atmosphere, homogenized and scalped. [2]. The reason for the selection of this 3-step over aging treatment is that it gives rise to an excellent combination of 0.2% PS and stress corrosion cracking resistance in alloy sheets and plates [2,3].…”

Section: Methodsmentioning

confidence: 99%

“…[2]. The reason for the selection of this 3-step over aging treatment is that it gives rise to an excellent combination of 0.2% PS and stress corrosion cracking resistance in alloy sheets and plates [2,3]. Following solution treatment, the plates were also naturally aged for 2 months in order to examine the nature of the precipitates present within the microstructure and to detect precipitate, if any, at the grain boundary.…”

Section: Methodsmentioning

confidence: 99%

Influence of microstructure on the subzero temperature tensile properties of heat treated AA7010 plates

Prasad

Murali

Prasad

et al. 2010

Trans Indian Inst Met

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The influence of variation in test temperature i.e. ambient and subzero (-50 o C) on the tensile properties of aluminium alloy 7010 plates, heat treated to varying aging conditions (i.e. naturally aged, under aged, peak aged and over aged), have been examined. It is shown that the maximum increase in strength properties (both yield and ultimate tensile strengths) upon changing the test temperature from ambient to subzero is obtained in the case of naturally aged samples. Whilst, there is a minimal increase in the strength properties of the under aged samples when tested at -50 o C. These results are discussed in light of changes in the work hardening behaviour of the materials with aging. It is further observed, irrespective of the test temperature, that there is a distinct change in the mode of fracture on tensile loading from a combination of predominantly shear together with partial ductile dimple fracture in the naturally aged samples to predominantly ductile dimple fracture in the over aged samples. This is correlated with the significant increase in the number density of void nucleating precipitates with artificial aging.

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“…Duas características obrigatórias devem ser exibidas pelos diagramas de fases dos sistemas das ligas para haver endurecimento por precipitação: i) deve haver uma solubilidade máxima apreciável de um componente do outro, na ordem de vários pontos percentuais; ii) deve haver um limite de solubilidade que diminua rapidamente com a concentração do componente principal com uma redução na temperatura (Mukhopadhyay, 2009).…”

Section: Tratamentos Térmicosunclassified

Comportamento Mecânico da Liga de Alumínio 2024 Submetida a Diferentes Tempos de Envelhecimento

Cavalcante

Silva²

2017

HOLOS

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RESUMOLigas de alumínio tratáveis termicamente podem sofrer significativas alterações em suas propriedades mecânicas dependendo do tratamento realizado. Estudos recentes apontam que algumas ligas de alumínio subenvelhecidas podem experimentar o fenômeno do autorreparo ou autocura (self healing). Ou seja, quando solicitados mecanicamente, podem apresentar o fechamento ou a redução na velocidade de crescimento de trincas devido à introdução de tensões compressivas locais associadas à precipitação dinâmica de fases intermetálicas. Isso abre um leque de condições que podem ampliar novos conceitos de projetos de engenharia relacionados aos materiais metálicos principalmente no que se aplica à indústria aeronáutica. O objetivo deste trabalho é avaliar a relação entre as propriedades mecânicas e os tratamentos térmicos de uma liga de alumínio 2024 quando submetida a solubilização (480°C e 2,5h) e envelhecimento artificial (190°C por 1h, 3h, 5h, 8h e 12h), obtendo amostras em condições de subenvelhecimento, máximo de resistência e superenvelhecimento. Esses materiais foram caracterizados mecanicamente em relação ao ensaio de tração uniaxial (ASTM E8/E8M); do ponto de vista estrutural, através das microscopias óptica (MO), eletrônica de varredura (MEV) e microanálise por espectroscopia de energia dispersiva (EDS). Nos resultados da liga 2024 subenvelhecida esse fenômeno de autocura tornou-se palpável, pois verificou-se a ocorrência de envelhecimento dinâmico nas amostras no estado de entrega e subenvelhecidas associado a pequenos serrilhados nas curvas tensão x deformação. Isso traz uma excelente perspectiva para a investigação do fenômeno do autorreparo nas condições de subenvelhecimento, proporcionando o emprego de novos projetos mecânicos. PALAVRAS-CHAVE:liga de alumínio 2024, autorreparo, precipitação dinâmica, comportamento mecânico. Mechanical Behavior of 2024 Aluminum Alloy Submitted for Different Aging Times ABSTRACTHeat treatable aluminum alloys may experience significant changes in mechanical properties depending on heat treatment developed. Recently, some researches showed that some aluminum alloys in underaged conditions may indicate the self-healing phenomenon, in other words, when stretched mechanically, the material could present a closure, or a reduction in crack growth rate due local compressive stress associated to dynamic precipitation. In this context, its valued the relationship between mechanical properties and heat treatment in 2024 aluminum alloy when submitted to solubilization (480° C for 2,5h) and artificial aging (190° C for 1h, 3h, 5h, 8h and 12h), obtaining underaged, peak hardness and overaged conditions. The samples were mechanically featured using a tensile test (ASTM E8/E8M); in structural aspects, using optical microscopy, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). In underaged 2024 aluminum alloy, the phenomenon of self-healing has become tangible, because occurred dynamic precipitation on samples as received and underaged conditions, associated ...

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Microstructure and properties of high strength aluminium alloys for structural applications

Cited by 45 publications

References 26 publications

Influence of Retrogression and Re-aging on the Exfoliation Corrosion Behavior of AA 7085 Sheets

Influence of Retrogression and Re-aging on the Exfoliation Corrosion Behavior of AA 7085 Sheets

Influence of microstructure on the subzero temperature tensile properties of heat treated AA7010 plates

Comportamento Mecânico da Liga de Alumínio 2024 Submetida a Diferentes Tempos de Envelhecimento

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