The precipitation sequence in Al–Mg–Si alloys

Edwards, Geoffrey A.; Stiller, Krystyna Marta; Dunlop, G. L.; Couper, Malcolm J.

doi:10.1016/s1359-6454(98)00059-7

Cited by 1,208 publications

(713 citation statements)

References 24 publications

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“…4) and tensile strength increase significantly [18]. During ageing, annihilation of dislocations and formation of strainfree grains reduces the strength, while the formation of nanosized precipitates increases the strength [34][35][36][37]. The cumulative effect is that all aged samples have better properties compared to as-rolled samples, as shown in Figs.…”

Section: Strength Of As-rolled and Aged Sheetsmentioning

confidence: 89%

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

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An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 degrees celcius. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-Cr-Mn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm. An asymmetric cryorolling technique was used to reduce the thickness of an Al-Mg-Si alloy sheet from 1.5 mm to 0.19 mm. The samples were subsequently aged for 48 h at 100 1C. The hardness and tensile strength of both rolled and aged sheets increased with the number of passes up to the sixth pass, but the tensile stress decreased after the seventh pass. Investigation of the microstructure of the sheets showed that the grain size after seven passes was about 235 nm and revealed the presence of Fe-CrMn-Si particles in the samples. The deformation of Fe-Cr-Mn-Si particles and sheet thickness affects the ductility when the sheet thickness is less than 0.4 mm, and the strength when the thickness is less than 0.2 mm.

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Section: Strength Of As-rolled and Aged Sheetsmentioning

confidence: 89%

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Tieu

Lü

et al. 2013

Materials Science and Engineering: A

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“…Since the nominal content of each of these elements is well below the solubility limit at all relevant solution temperatures, permanent solute loss by precipitation of constituent phases like pure Si, Al 3 Mg 2. Al 12 Mn etc., can be ignored. However, because Si and Mn will react with Fe to form the intermetallic compound a-Al 15 (Fe,Mn) 3 Si 2 during solidification and homogenisation, [61,62] it is necessary to correct for this when calculating their matrix concentrations and subsequent contribution to solid solution hardening.…”

Section: Framework For Calculating the Macroscopic Yield Strengthmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19] In the past, the relevant structure-property relationships have been captured mathematically in the combined precipitation, yield strength (YS), and work-hardening (WH) model being developed by two of the authors. [20][21][22] Later, it has been renamed the nanostructure model (NaMo) in order to reach out to a wider audience and make the work accessible to people with a background in finite element simulations and advanced structural analyses as well.…”

Section: Introductionmentioning

confidence: 99%

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

Myhr

Grong

Schäfer

2015

Metall Mater Trans A

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In this article, a new age-hardening model for Al-Mg-Si alloys is presented (named NaMo-Version 2), which takes into account the combined effect of cold deformation and prolonged room-temperature storage on the subsequent response to artificial aging. As a starting point, the original physical framework of NaMo-Version 1 is revived and used as a basis for the extension. This is permissible, since a more in-depth analysis of the underlying particle-dislocation interactions confirms previous expectations that the simplifying assumption of spherical precipitates is not crucial for the final outcome of the calculations, provided that the yield strength model is calibrated against experimental data. At the same time, the implementation of the Kampmann-Wagner formalism means that the different microstructure models can be linked together in a manner that enforces solute partitioning and competition between the different hardening phases which form during aging (e.g., clusters, b¢¢ and b¢). In a calibrated form, NaMo-Version 2 exhibits a high degree of predictive power, as documented by comparison with experiments, using both dedicated nanostructure and yield strength data as a basis for the validation. Hence, the model is deemed to be well-suited for simulation of thermomechanical processing of Al-Mg-Si alloys involving cold-working operations like sheet forming and stretch bending in combination with heat treatment and welding.

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“…As mentioned above, the peak temperature experienced in the weld centre would be expected to be over 400 C. The softening behaviour seen immediately after welding in the hardness profiles can, therefore, be attributed to the dissolution of solute clusters and fine GPZs (Guinier-Preston zones) present in the T4* temper parent sheet [10], because the GP solvus temperature (~ 210 C) was greatly exceeded [20]. As further precipitation was largely suppressed, owing to the rapid welding cycle, this resulted in a supersaturated solid solution within the weld centre that could fully respond to post-weld ageing.…”

Section: Weld Zone Precipitationmentioning

confidence: 97%

The effect of a paint bake treatment on joint performance in friction stir spot welding AA6111-T4 sheet using a pinless tool

Chen

Liu

Bakavos

et al. 2013

Materials Chemistry and Physics

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It has been previously shown that it is possible to produce friction stir spot welds (FSSW) in thin (1 mm thick) aluminium sheet, when using a tool without a probe, which has the significant advantage of not leaving a keyhole in the weld. The aim of this paper was to investigate the effect of a post-weld paint bake cycle on the performance and precipitation behaviour of FSSW joints produced using a pinless tool, in the heat-treatable Al automotive alloy AA6111-T4, with rapid, industrially relevant, weld cycle times. It has been demonstrated that strong joints could be obtained within < 1 second, that exhibited a nugget pull-out failure mode, and the weld strength increased further after the paint bake treatment. After the paint bake cycle the weld zone was found to be considerably harder than the parent material and this behaviour has been attributed to 2 the shorter delay time between welding and artificial ageing, relative to the longer pre-natural ageing time experienced by the parent sheet. With a rapid (< 1 sec) weld cycle, no hardness minima were observed in the heat affected zone (HAZ) after the paint-bake treatment.

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The precipitation sequence in Al–Mg–Si alloys

Cited by 1,208 publications

References 24 publications

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

Mechanical properties of Al–Mg–Si alloy sheets produced using asymmetric cryorolling and ageing treatment

An Extended Age-Hardening Model for Al-Mg-Si Alloys Incorporating the Room-Temperature Storage and Cold Deformation Process Stages

The effect of a paint bake treatment on joint performance in friction stir spot welding AA6111-T4 sheet using a pinless tool

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