Forming-Limit Diagrams for Hot-Forming of AA5083 Aluminum Sheet: Continuously Cast Material

Kulas, Mary Anne; Krajewski, Paul E.; Bradley, John R.; Taleff, Eric M.

doi:10.1007/s11665-007-9057-8

Cited by 19 publications

(11 citation statements)

References 6 publications

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“…Aluminium sheets are extensively used in automobile industries next to steel (Mary-Anne Kulas et al, 2007) due to its light weight and good resistance to corrosion. Among the Aluminium alloys of various grades, Al 8011 possesses good strength.…”

Section: Specimen Preparationmentioning

confidence: 99%

Application of Taguchi approach on investigation of formability for perforated Al 8011 sheets

Elangovan¹,

Narayanan²

2010

Int. J. Eng. Sci. Tech

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Sheet metal forming is a vital manufacturing process used in the automobile, aerospace, agriculture and architecture industries. The sheet metal is formed to various shapes to make useful components. The perforated sheets replace the solid sheet in some applications because of aesthetic appearance and low weight compared to solid sheet metal. The ability of the sheet metals to be formed into various shapes without failure is termed as formability. The formability of perforated sheet depends on chemistry of the material, the forming parameters, dimensions of the perforations and ligament width. In this paper, the forming limit diagram for perforated Al 8011 sheet of 1mm thickness has been evaluated and the influences of the diameters of perforations and ligament widths on the forming limit strains have been studied. The ligament width is the most influencing factor which has the percentage contribution of 70.04 and 72.55 in Tension-Compression, 69.65 in Plane strain and 51.49 and 71.84 in Tension-Tension conditions. This work gives reasonable forming limit plastic strains of the perforated sheets with various combinations of the diameters of perforations and ligament widths and also gives the prediction of these strains by varying it.

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Section: Specimen Preparationmentioning

confidence: 99%

Application of Taguchi approach on investigation of formability for perforated Al 8011 sheets

Elangovan¹,

Narayanan²

2010

Int. J. Eng. Sci. Tech

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“…[5][6][7] For SPF, grain-boundary-sliding (GBS) creep is widely recognized to be the dominant deformation mechanism in fine-grained AA5083 sheet. [5,[8][9][10][11][12][13] Under GBS creep, the dominant failure mechanism of AA5083 is cavitation.…”

Section: Superplastic Forming (Spf) Is a Traditional Hot-mentioning

confidence: 99%

“…[5,6] Under SD creep, cavitation can still lead to failure, but flow localization (e.g., necking) becomes the controlling failure mechanism in some geometries. [6,7] Differences in cavitation evolution with strain, including cavitation growth rate and cavity morphology, have been observed between deformation controlled by GBS creep and deformation controlled by SD creep. [6] However, the initiation strains for cavitation are quite similar between GBS and SD creep deformation, [6] suggesting that cavitation initiates in a similar manner under both deformation mechanisms.…”

Section: Superplastic Forming (Spf) Is a Traditional Hot-mentioning

confidence: 99%

Effect of Microstructure on Cavitation during Hot Deformation of a Fine-Grained Aluminum-Magnesium Alloy as Revealed through Three-Dimensional Characterization

Chang

Taleff

Krajewski

2009

Metall Mater Trans A

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The effect of microstructure on cavitation developed during hot deformation of a fine-grained AA5083 aluminum-magnesium alloy is investigated. Two-point correlation functions and threedimensional (3-D) microstructure characterization reveal that cavitation depends strongly on the mechanism that controls plastic deformation. Grain-boundary-sliding (GBS) creep produces large, interconnected cavities rapidly during plastic straining. Solute-drag (SD) creep produces isolated cavities with less total volume fraction at a given strain. The 3-D microstructure data reveal adjacency between various microstructural features. Cavities are observed to be preferentially adjacent to large Al 6 (Mn,Fe) particles and to Mg-Si particles of all observed sizes. These data suggest that cavities preferentially nucleate at Mg-Si particles and at large Al 6 (Mn,Fe) particles. This result may be applied to reduce cavitation in commercial hot-forming operations utilizing aluminum-magnesium alloys.

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“…The testing approach, recently referred to as the pneumatic stretching test, 21,22 has been successfully used to construct the FLCs for several alloys, including the AA5083, at temperatures as high as 550°C. [21][22][23][24][25][26][27][28][29] The only drawback though is that FLCs produced by this test are "incomplete", in the sense that they are always confined to the right quadrant of an FLD (negative minor strains are not attainable).…”

Section: Introductionmentioning

confidence: 99%

The development of a forming limit surface for 5083 aluminum alloy sheet

Abu-Farha

2011

JOM

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How would you……describe the overall significance of this paper? This article addresses the current limitation of forming limit curves in satisfying the needs of warm/hot sheet metal forming operations; particularly the ones carried out at non-isothermal conditions. The concept of a "Forming Limit Surface" is introduced as the means to resolve the latter limitation through a comprehensive map that describes material formability over wide-ranging temperatures.…describe this work to a materials science and engineering professional with no experience in your technical specialty? Formability of a 5083 aluminum alloy sheet is investigated at different temperatures ranging between 250 and 550°C. The results are expressed in the form of a continuous three-dimensional surface: the x-axis represents the biaxial strain ratio, while the y-axis represents the forming temperature; the z-axis provides the maximum strain the material can undergo before failure. …describe this work to a layperson?Testing is performed on a selected aluminum sheet to evaluate its "ability-to-stretch" at different temperatures. The results are presented in a unique way using a 3D plot.A custom mechanical stretching setup based on the Nakazima method was designed and built for testing sheet metals at elevated temperatures. Specimens from a fine-grained 5083 aluminum alloy sheet were deformed at various temperatures, spanning between those associated with warm forming (250°C) and hot forming (550°C). Circle grid analysis of the deformed specimens produced the forming limit curves at each of the covered temperatures, hence revealing the great influences of forming temperature on the material's formability limits. Finally, all the curves were combined to construct a unique three-dimensional forming limit surface, which we present here as a more comprehensive map for describing material formability limits at wide-ranging temperatures.

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Forming-Limit Diagrams for Hot-Forming of AA5083 Aluminum Sheet: Continuously Cast Material

Cited by 19 publications

References 6 publications

Application of Taguchi approach on investigation of formability for perforated Al 8011 sheets

Application of Taguchi approach on investigation of formability for perforated Al 8011 sheets

Effect of Microstructure on Cavitation during Hot Deformation of a Fine-Grained Aluminum-Magnesium Alloy as Revealed through Three-Dimensional Characterization

The development of a forming limit surface for 5083 aluminum alloy sheet

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