Shear Deformation Properties of Extruded AlZnMg Alloys

Fjeldly, Alexander; Roven, Hans Jørgen; Rauch, E.F.

doi:10.1016/s1359-6462(97)00539-3

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…A transmission electron microscopy enhances the overall ductility of the material considerably. study of the present AlZnMg alloys [15] supports this observaIn Figure 18, the enhancement of the formability is visualtion. In Figure 17, slip localization is shown for the 7030 ized.…”

Section: Discussionsupporting

confidence: 76%

Effects of strain rate and anisotropy on the tensile deformation properties of extruded AlZnMg alloys

Fjeldly

Roven

2000

Metall Mater Trans A

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Two extruded AlZnMg alloys have been investigated in uniaxial tension, emphasizing the mechanical anisotropy and strain-rate effects. A strong mechanical anisotropy was found in the extruded profiles which had recrystallized and nonrecrystallized microstructures. The recrystallized alloy had a lower strength level and less variation in ductility and formability parameters than the nonrecrystallized alloy. Mg in solid solution causes dynamic strain aging (DSA) in both alloys. With increasing strain rate, the DSA became less effective and the strain localization caused by DSA vanished. Thus, the room-temperature formability, in the solution heat-treated and quenched condition, may be improved significantly by a sufficient increase of the strain rate. Additional tests on an as-cast sheet-ingot AlMg alloy were performed to isolate the effect of Mg from Zn in solid solution. These tests confirmed the effect of strain rate on the tensile behavior.

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Section: Discussionsupporting

confidence: 76%

Effects of strain rate and anisotropy on the tensile deformation properties of extruded AlZnMg alloys

Fjeldly

Roven

2000

Metall Mater Trans A

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“…The behaviour is different in the PA case. No significant change occurs between 220uC and room temperature, while a further increase to 60uC causes a large increase in the magnitude of S. One explanation of this may be that |Dg0 T |,k B in the peak aged temper as C 0,NA .C 0,PA in equation (12).…”

Section: Theoretical Aspects Of Strain Rate Sensitivitymentioning

confidence: 99%

“…The present study is aimed at characterisation of DSA properties of AA7030 aluminium alloy with respect to heat treatment, temperature and strain rate. Fjeldly and coworkers [10][11][12][13][14][15] have earlier investigated the extruded AA7030 with respect to SRS, PLC effect and anisotropy, however only in the solution treated condition at room temperature. In the present study also the peak aged temper is included, because this is the condition in which the material is used industrially.…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain rate dependence of the dynamic strain aging effect in an Al–Zn–Mg alloy

Hörnqvist¹,

Karlsson²

2006

Materials Science and Technology

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An AA7030 alloy (Al-5 . 4Zn-1 . 2Mg) was tested for evidence of dynamic strain aging in naturally aged and peak aged condition and under varying conditions in terms of strain rate and temperature. Clear evidence in terms of strain rate sensitivity, serrated yielding (Portevin-Le Chatelier effect) and propagative plastic instabilities was observed in the naturally aged temper while the peak aged temper only showed serrated yielding. Further evidence of dynamic strain aging was the temperature and strain dependence of the strain rate sensitivity, which can be explained by the additional dislocation activation energy resulting from solute pinning. Investigation of the specimen surfaces was carried out to reveal an orange peel structure with pronounced glide bands. Small cracks within individual grains rather than grain boundary cracking could be observed.

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“…O ensaio de cisalhamento foi realizado com uso de um dispositivo adaptado à máquina de ensaios Instron 5582. (7)(8)(9) A deformação cisalhante, γ, alcançada pelo corpo de prova ao término do ensaio foi calculada através da razão do deslocamento vertical (∆L) pela largura efetiva (b), como descrito pela Equação (2). Os valores de ∆L e de b foram obtidos com uso do projetor de perfis Mitutoyo modelo PJ 311.…”

Section: Laminação/tração/cisalhamentounclassified

Efeito De Mudanças Sucessivas Na Trajetória De Deformação No Comportamento Mecânico De Metais

Lopes,

Corrêa,

Campos

et al. 2009

ABM Proceedings

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ResumoMetais submetidos a diversos tipos de esforços mecânicos apresentam características de encruamento distintas das observadas em condições de deformação plástica simples (carregamento monotônico). As respostas exibidas pelos metais após uma rota de processamento mecânico dependem de diversas variáveis como o próprio modo de deformação e das características estruturais do material. A relação entre essas variáveis e os fenômenos detectados nos metais sob deformação plástica intensa não estão completamente compreendidos. Este trabalho estuda o comportamento mecânico apresentado por três materiais: o aço de baixo teor de carbono, o aço inoxidável AISI 430 e o latão CuZn34, após a imposição de três seqüências de carregamento mecânico. Os resultados obtidos confirmam a influência da estrutura cristalina no encruamento dos metais, mas a magnitude dos efeitos não pode ser explicada apenas por essa variável. Palavras-chave: Trajetória de deformação; Aço inoxidável AISI 430; Latão; Aço de baixo teor carbono. THE EFFECT OF SUCCESSIVE STRAIN-PATH CHANGES ON THE MECHANICAL BEHAVIOR OF METALS AbstractMetals submitted to various types of mechanical efforts present work-hardening characteristics distinct from those observed in conditions of simple straining (monotonic loading). The behavior of the metals after following a route of mechanical processing depends on several variables, such as the mode of deformation and the structural characteristics of the material. The relationship among these variables and the phenomena detected plastically deformed are not completely understood. This paper studies the mechanical behavior presented by three sheet materials: low carbon steel, AISI 430 stainless steel and CuZn34 brass, after a loading sequence composed by rolling followed by tension and shear. The results confirm the influence of the crystalline structure on the work-hardening of the metals, but the magnitude of the effects cannot be explained only by this variable.

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Shear Deformation Properties of Extruded AlZnMg Alloys

Cited by 10 publications

References 7 publications

Effects of strain rate and anisotropy on the tensile deformation properties of extruded AlZnMg alloys

Effects of strain rate and anisotropy on the tensile deformation properties of extruded AlZnMg alloys

Temperature and strain rate dependence of the dynamic strain aging effect in an Al–Zn–Mg alloy

Efeito De Mudanças Sucessivas Na Trajetória De Deformação No Comportamento Mecânico De Metais

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