Yield Point Elongation in Al-Mg Alloys

Inagaki, Hirosuke; Komatsubara, Toshio

doi:10.4028/www.scientific.net/msf.331-337.1303

Cited by 10 publications

(7 citation statements)

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“…[49] A discussion of the intricacies of PLC banding lies outside this investigation; however, the aspect of this behavior that is germane to this particular study is the evolution of the macroscopically scaled planar bands that emerge in a periodic fashion on the specimen surface. [50,51] Even though recent research by Halim et al [52] suggests that failure and PLC band formation may be independent, it is generally believed that PLC banding enhances strain localization by focusing deformation into the regions surrounding the PLC bands. [53] The different widths of the uncertainty envelopes associated with the estimated Rt distributions in Figure 10 suggest that PLC banding may also have had an influence on the variability of the predicted Rt behavior by increasing the variability in the Weibull scale parameter a.…”

Section: Discussion Of Resultsmentioning

confidence: 97%

A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754

Stoudt

Hubbard

Iadicola

et al. 2009

Metall Mater Trans A

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Three-dimensional, matrix-based statistical analysis methods were developed and integrated with high-resolution topographical imaging, to assess how microstructural changes influence the evolution of plastic deformation and strain localization in a commercial AA5754-O aluminum sheet in three in-plane strain modes. Analysis of the raw surface data revealed that the general composition of the surface roughness was highly sensitive to strain mode and strain level. The microstructural conditions that promote strain localization were assessed by extending a profilebased surface roughness parameter (Rt) to matrix form. Both analyses revealed that different strain modes produce characteristic dissimilarities in the deformation at the grain level. The localization data can be well characterized with a two-parameter Weibull distribution, suggesting that strain localization is a stochastic process that can be modeled reliably with Weibull statistics. This study clearly demonstrates that an accurate and straightforward probabilistic expression that captures the microstructural subtleties produced by plastic deformation can be developed from rigorous analyses of raw topographic data. Because variations in surface morphology profoundly influence the reliability of the numerical models used to predict strain localization, incorporating expressions of this type could greatly enhance the accuracy of these models.

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Section: Discussion Of Resultsmentioning

confidence: 97%

A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754

Stoudt

Hubbard

Iadicola

et al. 2009

Metall Mater Trans A

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“…the cube {100} á 100 ñ , diminishes as silicon particle size and volume fraction increase. Koizumi et al 7 have shown that the overall texture begins to decrease for silicon contents as low as 0 . 4%.…”

Section: Texturementioning

confidence: 99%

Comparison of flow behaviour and microstructure and texture development of aluminium alloy A356 in semisolid state submitted to two different thermomechanical treatments

Kliauga¹,

Ferrante²

2002

Materials Science and Technology

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In the present work, an ingot of a commercial aluminium alloy, A356 (Al ± 7Si ± 0 . 3Mg), was deformed by rolling; a second ingot was extruded; and a third was cast in such a way as to obtain ® ne sized dendrites. All specimens were partially remelted in a salt bath, and water quenched. Microstructural examination indicated that the particle growth rate was reasonably similar for all specimens; however, while rolling gave an almost ideal microstructure of equiaxed particles, extrusion produced microstructural heterogeneities that led to abnormal grain growth and liquid segregation. Texture studies indicated that the rolled specimen recrystallised during heating to the semisolid state, while the extruded specimen recrystallised immediately after deformation. Simple compression experiments (parallel plates) showed that for high solid fractions (0 . 80) the extruded material exhibited the highest deformation response among specimens, but when the solid fraction was lower (0 . 60) the deformation behaviour of as cast, extruded, and rolled specimens was similar. Skeleton formation and liquid segregation were found to be associated with both non-spherical morphologies and high solid fractions.MST/5025

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“…The yield plateau (YP) phenomenon, which is also named yield point elongation, is a special yielding behavior during mechanical tests of many kinds of metals and alloys [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. It is characterized by a region of approximately constant stress in the stress-strain curve following the yield point.…”

Section: Introductionmentioning

confidence: 99%

Probing into the Yield Plateau Phenomenon in Commercially Pure Titanium During Tensile Tests

Shi

Cao

Fan

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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To explain the intrinsic mechanism of the yield plateau phenomenon in commercially pure titanium, the tensile behaviors of commercially pure titanium specimens after 91.6% cryorolling and subsequent annealing at 280 °C, 335 °C, 450 °C and 600 °C have been studied. The results show that the yield plateau phenomenon is a result of dislocation behaviors controlled by grain size and thus only exists within a given range of mean grain size. α grain boundaries are the main dislocation multiplication sources of commercially pure titanium. Fine-grained microstructure could offer numerous dislocation multiplication locations during deformation. Once the applied stress is above the yielding strength, dislocations multiply rapidly and the mobile dislocation density is high. To retrieve the imposed strain rate, the mean dislocation velocity is bound to be low. Therefore, it takes time for them to interact with each other. As a result, the movement of dislocations is hardly blocked and the deformation could continue at a nearly constant applied stress. Consequently, the so-called yield plateau behavior presents in the tensile curves. The disappearance of yield plateau phenomenon in coarse-grained and ultrafine-grained microstructures is attributed to the quick realization of the mutual interactions among dislocations at the initial stage of tensile test.

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Yield Point Elongation in Al-Mg Alloys

Cited by 10 publications

References 0 publications

A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754

A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754

Comparison of flow behaviour and microstructure and texture development of aluminium alloy A356 in semisolid state submitted to two different thermomechanical treatments

Probing into the Yield Plateau Phenomenon in Commercially Pure Titanium During Tensile Tests

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