Cluster evolution mechanisms during aging in Al–Mg–Si alloys

Fallah, Vahid; Langelier, Brian; Ofori-Opoku, Nana; Raeisinia, Babak; Provatas, Nikolas; Esmaeili, Shahrzad

doi:10.1016/j.actamat.2015.09.027

Cited by 139 publications

(50 citation statements)

References 41 publications

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“…The resulting phases after casting, like Al 5 FeSi, are well-known and investigated by several authors [21][22][23]. The process of precipitation and the hardening phases during NA and AA have been investigated by Mondolfo [24] and other authors [25][26][27][28][29]. To analyze the different phases in detail, using another etching and a TEM is irreplaceable for further investigations.…”

Section: Discussionmentioning

confidence: 99%

Influence of Short-Term Heat Treatment on the Mechanical Properties of Al–Mg–Si Profiles

Kernebeck

Weber

2018

Metals

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Aluminum profiles-for instance, profiles made of precipitation-hardenable alloys-are increasingly used for decorative details in the automotive industry. Typically, after hot extrusion and at least two to three days of natural aging (NA), the aluminum profiles are artificially aged. A commercial EN AW-6060 alloy of high purity was used for this investigation. Tensile tests were used as the main measurement method. This article focuses on the effect of short-term heat treatment on the point in time at which a significant increase of the ultimate tensile strength (UTS) during NA can be measured. Short-term heat treatment is shown to delay this point in time by almost four days, but it increases the variation of UTS. A heterogeneous temperature profile during short-term heat treatment was identified as one reason for this result. Finally, a strategy for minimizing variations in mechanical properties of artificially-aged aluminum alloys was developed, based on the experimental results of this study.

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Section: Discussionmentioning

confidence: 99%

Influence of Short-Term Heat Treatment on the Mechanical Properties of Al–Mg–Si Profiles

Kernebeck

Weber

2018

Metals

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“…17 Analysis of clusters´ energy shows that the Mg-enrichment is a condition for clusters stabilization [33].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The relative stability of NA clusters leads to less solute availability for clustering or precipitation under subsequent aging at temperatures below 483K [7,22,30]. The high Mg/Si ratio reached by clusters under aging at 373K leads to their relative stabilization, and subsequent transformation to β" phase [33]. First-principle calculations of formation enthalpies have shown that they monotonically decrease in the order of the observed phase transformation: ∆H(SS) ≥ ∆H(pre-β") ≥ ∆H(β") [4].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Solute clustering behavior between 293K and 373K in a 6082 Aluminum alloy

Grau

Cuniberti

Tolley

et al. 2016

Journal of Alloys and Compounds

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“…Precipitation hardening is one of the key mechanisms that enable Al-Mg-Si-Cu alloys to provide better properties [3,4]. …”

Section: Introductionmentioning

confidence: 99%

Aging Response and Precipitation Behavior after 5% Pre-Deformation of an Al-Mg-Si-Cu Alloy

Jin

Ngai

et al. 2018

Materials

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In this study, Al-1.00 Mg-0.65 Si-0.24 Cu alloy was solution heat-treated, water-quenched, and then pre-deformed for 5% before aging. The peak hardness and yield strength of the pre-deformed sample with subsequent artificial aging were similar to that of a T6 condition sample. It was also found that the pre-deformation treatment could inhibit the negative influence of natural aging to some degree. After seven days of natural aging, the pre-deformed sample obtained better peak hardness and yield strength upon artificial aging than the sample without pre-deformation. In addition, the pre-deformation treatment could reduce 50% of the artificial aging time to reach the peak aging condition compared with T6 treatment. For the peak aged condition in the pre-deformed sample, transmission electron microscopy (TEM) observation found two types of precipitates exhibited along the dislocations besides the β″ precipitates in the Al matrix. Both precipitates had disordered atomic arrangements on the ordered subcell (Si network). The disordered precipitates occupied a number of Mg and Si atoms, resulting in less β″ precipitates formed during artificial aging at 180 °C.

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Cluster evolution mechanisms during aging in Al–Mg–Si alloys

Cited by 139 publications

References 41 publications

Influence of Short-Term Heat Treatment on the Mechanical Properties of Al–Mg–Si Profiles

Influence of Short-Term Heat Treatment on the Mechanical Properties of Al–Mg–Si Profiles

Solute clustering behavior between 293K and 373K in a 6082 Aluminum alloy

Aging Response and Precipitation Behavior after 5% Pre-Deformation of an Al-Mg-Si-Cu Alloy

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