Modification of horizontal continuous casting Al–12%Si alloy using FSM master alloy

Zhang, Jing; Yu, Huashun; Kang, Suk Bong; Cho, Jae Hyung; Min, Gao

doi:10.1016/j.matchar.2012.10.010

Cited by 12 publications

(6 citation statements)

References 30 publications

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“…At a certain Al concentration, entrapment of this Al-rich layer in small pockets of high Al concentration can occur [34,36]. Moreover, Si clusters which were not completely dissolved in the melt can also be incorporated at the solidifying growth front resulting in interstitial lattice defects [37]. Such interstitials may aggregate and produce a strain field towards which Al will diffuse.…”

Section: Al and Sr Concentrations In Simentioning

confidence: 99%

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Barrirero

Engstler

Ghafoor

et al. 2014

Journal of Alloys and Compounds

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Comparison of segregations formed in unmodified and Sr-modified Al-Si alloys studied by atom probe tomography and transmission electron microscopy, 2014, Journal of Alloys and Compounds, (611) AbstractThe mechanical properties of Al-7 wt.% Si can be enhanced by structural modifications of its eutectic phase. Addition of low concentrations of certain elements, in this case 150 wt-ppm Sr, is enough to cause a transition from a coarse plate-like Si structure to a finer coralline one. To fully understand the operating mechanism of this modification, the composition of the eutectic Si phase in unmodified and Sr-modified alloys was analysed and compared by Atom Probe Tomography and (Scanning) Transmission Electron Microscopy. The unmodified alloy showed nanometre sized Al-segregations decorating defects, while the Sr-modified sample presented three types of Al-Sr segregations: (1) rod-like segregations that promote smoothening of the Al-Si boundaries in the eutectic phase, (2) particle-like segregations comparable to the ones seen in the unmodified alloy, and (3) planar segregations favouring the formation of twin boundaries. Al and Sr solubilities in Si after solidification were determined to be 430 ± 160 at-ppm and 40 ± 10 at-ppm, respectively. Sr predominantly segregates to the Si phase confirming its importance in the modification of the eutectic growth.

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Section: Al and Sr Concentrations In Simentioning

confidence: 99%

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Barrirero

Engstler

Ghafoor

et al. 2014

Journal of Alloys and Compounds

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“…However, we can analyze from the experimental data of eutectic Si and the correlative theories. 3 The eutectic temperatures of A390 alloys with different amounts of Sr From the previous studies [22][23][24], alloy melt shows microscopic stratification when it approaches to its liquidus temperature. This can be seen as metastable micro-emulsion layer consisting of a group of suspended particles or clusters certain elements enriched.…”

Section: Discussionmentioning

confidence: 99%

Effect of Strontium Modification on the Morphology of Primary Si in Hypereutectic Al-Si Alloys

Pang

Sun

Liu

et al. 2020

MSF

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In the present study, hypereutectic Al-Si alloys were modified by strontium and the effect of the strontium content and holding time on the morphology of primary Si was investigated. Primary Si is modified to imperfect octahedron with primary dendrites or secondary dendrites when the amount of Sr exceeds 0.04wt.%. With extending the holding time, there is no significant difference with the morphology of primary Si. However, the size of primary Si decreases remarkably when the holding time prolongs to 120min. Further analysis reveals that the Sr content has a considerable impact on the morphology of primary Si due to growth mechanism influence, while the modifying time mainly influences the size of primary Si.

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“…The morphologies of eutectic Si in Al-17%Si alloys convert from plate-like to coral-like shape in three-dimensions after modification, which is shown in Figure 13. The modification mechanism has been investigated in our former work [23]. The modification mechanisms can be concluded to: the Si-Si bonded nanoclusters are the genetic factors of the FSM master alloys which inherit the fine-grained structure to the HCC Al-12%Si alloy billet.…”

Section: Sem Analysesmentioning

confidence: 99%

Study on Dual Modification of Al-17%Si Alloys by Structural Heredity

Zhang

Chen

et al. 2015

Metals

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Abstract:In this study, Al-17%Si alloys were dual modified by fine-grained structural materials (FSM) according to structural heredity. Microstructure and thermal analyses were undertaken to study the modification effect of the FSM master alloy on primary and eutectic Si. Primary Si is refined to a smaller size and eutectic Si is modified from needle-like to fibrous shape after FSM master alloy addition. The optimal content of FSM master alloy is 20% and the holding time is 15min. Finer FSM master alloy leads to finer Al-17%Si alloy microstructure and more area percentage of α-Al. DSC analyses results show that FSM master alloy can raise the precipitation temperatures of primary and eutectic Si, meanwhile it can reduce the latent heat of Si solidification process.

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Modification of horizontal continuous casting Al–12%Si alloy using FSM master alloy

Cited by 12 publications

References 30 publications

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Comparison of segregations formed in unmodified and Sr-modified Al–Si alloys studied by atom probe tomography and transmission electron microscopy

Effect of Strontium Modification on the Morphology of Primary Si in Hypereutectic Al-Si Alloys

Study on Dual Modification of Al-17%Si Alloys by Structural Heredity

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