Evolution of dispersoids during multistep heat treatments and their effect on rolling performance in an Al-5% Mg-0.8% Mn alloy

Algendy, Ahmed Y.; Liu, Kun; Chen, X. Grant

doi:10.1016/j.matchar.2021.111487

Cited by 31 publications

(16 citation statements)

References 35 publications

(49 reference statements)

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“…In addition, an industrial high‐temperature heat treatment (HTH) (430 °C/2 h + 480 °C/2 h + 525 °C/2 h), which is a typical homogenization treatment, was performed as the base case for comparison. [ 14,26 ] After the heat treatments, the ingots were hot rolled to a plate with a thickness of 3.2 mm with an 88% reduction. Hot rolling was performed in multiple passes at a temperature of 500 °C ± 20 °C.…”

Section: Methodsmentioning

confidence: 99%

“…As shown in Figure 1d,e, numerous dispersoids appeared in the dendrite cells (dispersoid zone, DZ, marked with a dashed red line), whereas the areas adjacent to the intermetallic particles were almost dispersoid-free (thus forming DFZs, as marked with a dashed yellow line) owing to the depletion of the alloying elements (Mn, Fe, and Si) for dispersoid formation. [14,21] Owing to the higher homogenization temperature (525 °C) in the HTH treatment, the DFZs became wider and larger compared with that after LTH treatment (28 vol% vs 21.3 vol%).…”

Section: As-cast Microstructure and Its Evolution During Heat Treatmentmentioning

confidence: 99%

“…As shown in Figure 2, the size and number density of Mn-dispersoids are associated significantly with the heat treatment parameters, particularly temperature. [6,10,14] Owing to the higher temperature in the HTH treatment (525 °C), which was much higher than the formation temperature of Mn-bearing dispersoids (370-400 °C), [14,21] the Mn-dispersoids became coarser with a marked reduction in their number density (Figure 2b). By contrast, the LTH treatment resulted in a higher number of density and finer size of Mn dispersoids (Figure 2a).…”

Section: As-cast Microstructure and Its Evolution During Heat Treatmentmentioning

confidence: 99%

“…The results showed that a high‐volume fraction of Al 6 Mn dispersoids improved the flow stress during hot compression tests and effectively inhibited the growth of recrystallized grains. In our previous study, [ 14 ] we discovered that multistep heat treatments of Al‐5%Mg‐0.8%Mn alloy produced a high volume fraction of Mn‐bearing dispersoids and hence improved the alloy rolling performance and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that a high-volume fraction of Al 6 Mn dispersoids improved the flow stress during hot compression tests and effectively inhibited the growth of recrystallized grains. In our previous study, [14] we discovered that multistep heat treatments of Al-5%Mg-0.8%Mn alloy produced a high volume fraction of Mn-bearing dispersoids and hence improved the alloy rolling performance and mechanical properties.The final product of Al-Mg-Mn 5xxx alloys is generally delivered in sheet form with different thicknesses for various structural applications. Therefore, the cast materials are subjected to hot and cold rolling after homogenization to produce the final sheet products.…”

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confidence: 98%

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Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

2023

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Herein, the precipitation behavior of Mn‐bearing dispersoids in Al‐3Mg‐0.8Mn (AA5454) alloy subjected to different heat treatments is investigated. The effects of Mn‐bearing dispersoids on the tensile properties and recrystallization resistance of the abovementioned alloy during hot/cold rolling and postrolling annealing are evaluated. The results show that a low‐temperature three‐step heat treatment (275 °C/12 h + 375 °C/48 h + 425 °C/12 h) generates a higher number density of Mn‐bearing dispersoids with finer sizes compared with the typical high‐temperature heat treatment (430 °C/2 h + 480 °C/2 h + 525 °C/2 h), thus resulting in significantly improved tensile strengths of hot/cold‐rolled sheets. After annealing at 300 °C, the yield strength (YS) of the alloy reached 196 MPa after hot rolling and 237 MPa after cold rolling, showing an improvement of 30%–32% over samples subjected to high‐temperature heat treatment. In addition, the low‐temperature heat treatment provides a higher recrystallization resistance after hot and cold rolling owing to the higher number density of Mn‐bearing dispersoids and the lower fraction of dispersoid‐free zones. The YS contributions of various strengthening components after hot and cold rolling are discussed based on constitutive models. The predicted yield strengths agree well with the experimental values.

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Section: Methodsmentioning

confidence: 99%

Section: As-cast Microstructure and Its Evolution During Heat Treatmentmentioning

confidence: 99%

Section: As-cast Microstructure and Its Evolution During Heat Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 98%

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Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

2023

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Effect of Homogenization on Microstructure and Mechanical Properties of Al–Mg–Mn–Er Alloy

Shen,

Yao,

Yang

et al. 2024

Adv Eng Mater

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As a traditional nonage‐hardenable aluminum alloy, 5XXX aluminum alloy has a limited dispersion‐strengthening effect since it is challenging to obtain high‐density and fine‐sized dispersoids by a conventional homogenization treatment process. In this work, three different homogenization treatments, single‐stage homogenization, slope heating homogenization, and double‐stage homogenization are used in a new type Al–Mg–Mn–Er alloy to exploit the dispersion strengthening. The precipitation behavior of submicron‐sized Mn‐containing dispersoids and nanosized Al3Er precipitates is investigated. In single‐stage homogenization, the nucleation of the Mn‐containing dispersoid is completed within a span of 2 h at 460 °C, accompanied by noticeable coarsening and the Al3Er precipitate tended to nucleate at dislocation sites and form a chain‐like structure. In slope heating and double‐stage homogenization, during the initial phase of heat treatment, lower temperatures facilitate the nucleation of dispersoids. This leads to the uniform precipitation of Mn‐containing dispersoids within the grain interior and improves the chain distribution of the Al3Er precipitates. The double‐stage homogenization generates the finest dispersoids. The alloy reaches maximum strength in the double‐stage homogenization, and the yield strength is 177 MPa, representing a 22% increase compared to the single‐stage homogenization.

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Effect of Sc and Zr Additions on Dispersoid Microstructure and Mechanical Properties of Hot-Rolled AA5083

Algendy

Liu

Rometsch

et al. 2023

The Minerals, Metals &Amp; Materials Series

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Evolution of dispersoids during multistep heat treatments and their effect on rolling performance in an Al-5% Mg-0.8% Mn alloy

Cited by 31 publications

References 35 publications

Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

Effect of Mn‐Bearing Dispersoids on Tensile Properties and Recrystallization Resistance of Al‐3Mg‐0.8Mn Rolled Alloy

Effect of Homogenization on Microstructure and Mechanical Properties of Al–Mg–Mn–Er Alloy

Effect of Sc and Zr Additions on Dispersoid Microstructure and Mechanical Properties of Hot-Rolled AA5083

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