Effect of Cooling Rates during Solidification of Al-5.5%Mg-2.3%Si-0.6%Mn and Al-13%Mg&lt;SUB&gt;2&lt;/SUB&gt;Si Pseudo-Binary Alloys on Their Secondary-Particle Morphology and Tear Toughness

Shimosaka, Daisuke; Kumai, Shinji; Casarotto, Federico; Watanabe, Shuichiro

doi:10.2320/matertrans.l-mz201125

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…Suzuki et al 7) estimated the cooling rate of HSTRC A356 alloy strip using dendrite arm spacing (DAS) of primary ¡-Al dendrite. Shimosaka et al 8) estimated the cooling rate of HSTRC AlMgSiMn alloy strip by DAS and inter lamellar spacing (ILS) of its eutectic structure. In contrast to that, it is difficult to observe the clear DAS or ILS in solidified structure of AlMn based alloys including 3003 aluminum alloy.…”

Section: Effect Of Cooling Rates On Grain Size In As-cast 3003mentioning

confidence: 99%

Solidification Structure and Secondary Particles in Vertical-Type High-Speed Twin-Roll Cast 3003 Aluminum Alloy Strip

Sasisekharan

Kumai

2019

Mater. Trans.

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The effect of cooling rate on microstructure of vertical-type high-speed twin-roll cast 3003 aluminum alloy strip was investigated. The solidification structure was characterized in terms of grain size and kinds, size, morphology and chemical composition of secondary particles. The 3003 aluminum alloy strip consisted of cell structure, dendritic structure, globular grains and eutectic structure along the strip thickness direction. From the relationship between the cooling rates and as-cast grain size, the cooling rate of high-speed twin-roll cast strip surface area was estimated as 3.1 © 10 3 K/s. Significant differences in the formation of secondary particles were found between direct chill (DC)-casting and the high-speed twin-roll casting as a result of the different cooling rates; Al 6 (Mn,Fe) and ¡-Al(Mn,Fe)Si phase were identified in the DC-cast sample, whereas only ¡-Al(Mn,Fe)Si was predominant in the high-speed twin-roll cast strip. The Al 6 (Mn,Fe) particles in DC-cast sample were script-like morphology with high aspect-ratio. In contrast, ¡-Al(Mn,Fe)Si particles in the high-speed twin-roll cast strip was spore-like morphology. Most ¡-Al(Mn,Fe)Si particles in the strip were considered to be formed as one of the eutectic components from the liquid droplets trapped in the inter-dendrite regions. In particular, Fe-rich ¡-Al(Mn,Fe)Si phase was formed at strip central area due to the increase in Fe segregation at the growth front. [

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Section: Effect Of Cooling Rates On Grain Size In As-cast 3003mentioning

confidence: 99%

Solidification Structure and Secondary Particles in Vertical-Type High-Speed Twin-Roll Cast 3003 Aluminum Alloy Strip

Sasisekharan

Kumai

2019

Mater. Trans.

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“…It has been reported that the eutectic Mg 2 Si in as-cast Al-Mg-Si alloys have a variety of morphologies. Li [11] and Shimosaka [12] reported two typical morphologies: lamella and rod. Zhang [13,14], Li [15] and Li [16] also reported the other typical morphology: flake.…”

Section: Solidification and Microstructural Evolution Of Al-mg 2 Si Ementioning

confidence: 99%

“…However, there is no a sharp boundary between three typical morphologies; many observed morphologies are actually the mixture of typical morphologies. For example, a common morphology named as fibre [12][13][14] is the mixture of lamella and rod. Besides, depending on the detailed solidification conditions, the morphology of eutectic Mg 2 Si phase often deviates from the typical morphologies, exhibiting an irregular lamellar morphology or curved flake-like morphology.…”

Section: Solidification and Microstructural Evolution Of Al-mg 2 Si Ementioning

confidence: 99%

“…So, the morphological evolution of Al-Mg 2 Si eutectics arouses the interest of researchers. Li [11] and Shimosaka [12] found that increasing the cooling rate could transform eutectic Mg 2 Si from lamellae to rod. The literatures also reported that alloying elements could induce morphological change of eutectic Mg 2 Si phase.…”

Section: Solidification and Microstructural Evolution Of Al-mg 2 Si Ementioning

confidence: 99%

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The effects of varying Mg and Si levels on the microstructural inhomogeneity and eutectic Mg2Si morphology in die-cast Al–Mg–Si alloys

et al. 2018

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The effects of varying Mg and Si levels on the microstructural inhomogeneity and eutectic Mg 2 Si morphology in die-cast Al-Mg-Si alloys have been investigated. It was found both Mg and Si additions decreased the microstructural inhomogeneity by producing more well distribution of primary a-Al and Al-Mg 2 Si eutectics, but had contrary effects on eutectic Mg 2 Si morphology. The increasing Mg level transformed eutectic Mg 2 Si from rod or lamellae to curved flake with larger eutectic spacing k, while the increasing Si level promoted the formation of rod-like or lamellar eutectic Mg 2 Si with smaller k. The reason for the above evolutions can be traced back to alloys' solidification behaviour. Thermodynamic calculation indicates that both Mg and Si decrease the liquidus temperature and suppress the precipitation of coarse primary a-Al grains (which tend to agglomerate in centre zone of samples) during the first solidification in shot sleeve, thus reducing the microstructural inhomogeneity. Mg addition shifts the eutectic point to lower Mg 2 Si concentration and induces a slower eutectic growth rate, causing a lower Mg 2 Si volume fraction in Al-Mg 2 Si eutectic cell. On the contrary, Si addition increased the Mg 2 Si volume fraction in eutectic cell by raising the Mg 2 Si eutectic concentration and the eutectic growth rate. To minimize the interfacial energy, Al-Mg 2 Si eutectics with different Mg 2 Si volume fractions exhibit various morphologies. The tensile test results show that both Mg and Si improved the strength at the cost of ductility. However, due to the formation of fine Al-Mg 2 Si eutectics, Si induced less ductility sacrifice than Mg when achieving the same strength improvement.

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“…Recently, high-speed twin-roll casting (HSTRC) has attracted attention as a casting procedure for producing aluminum strip with high productivity [9][10][11][12][13][14][15][16] . The HSTRC can fabricate thin aluminum alloy strips from the melt, directly.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cooling Rate on Primary Particle and Solute Distribution in High-Speed Twin-Roll Cast Al-Mn Based Alloy Strip

2018

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Binary Al-Mn, ternary Al-Mn-Fe and Al-Mn-Si alloys were prepared by different cooling rates during solidi cation using direct chill-casting and high-speed twin-roll casting. Mn concentration and solute distribution in Al matrix were examined. The Mn concentration in solid solution was considered almost equivalent in as-cast condition. In contrast, much amount of decomposition of supersaturated Mn in solid solution occurred in high-speed twin-roll cast alloys after homogenization. In high-speed twin-roll cast strips, ne distribution of constituent particles in Al-Mn-Fe alloy and homogeneous solute distribution in Al matrix in Al-Mn-Si alloy were obtained due to the high cooling rate of the high-speed twin-roll casting. After homogenization treatment, coarsening and spheroidization of the constituent particles were mainly observed in Al-Mn-Fe alloy, while formation of ne dispersoids was predominantly observed in Al-Mn-Si alloy. Such differences in microstructure resulted from the decomposition behavior of supersaturated Mn in solid solution.

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Effect of Cooling Rates during Solidification of Al-5.5%Mg-2.3%Si-0.6%Mn and Al-13%Mg<SUB>2</SUB>Si Pseudo-Binary Alloys on Their Secondary-Particle Morphology and Tear Toughness

Cited by 17 publications

References 7 publications

Solidification Structure and Secondary Particles in Vertical-Type High-Speed Twin-Roll Cast 3003 Aluminum Alloy Strip

Solidification Structure and Secondary Particles in Vertical-Type High-Speed Twin-Roll Cast 3003 Aluminum Alloy Strip

The effects of varying Mg and Si levels on the microstructural inhomogeneity and eutectic Mg2Si morphology in die-cast Al–Mg–Si alloys

Influence of Cooling Rate on Primary Particle and Solute Distribution in High-Speed Twin-Roll Cast Al-Mn Based Alloy Strip

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