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Growth of Mg2Si crystals shaped by {100} and {111} facets from Al–Mg–Si melts in the presence of calcium

Abstract

In this work, primary Mg2Si crystals shaped by {100} and {111} facets were successfully fabricated in Al–Mg–Si melts via the adsorption and poisoning of Ca element. The modifier Ca plays an important role in determining the morphologies of primary Mg2Si, which can be transformed from dendrite (0 wt.%) to crystals with a combination of eight {111} and four {100} facets (0.08 wt.%), then to truncated cube (0.1 wt.%), and finally to a cube fully bounded by {100} facets (0.2 wt.%) with increasing Ca contents. The growth processes of cubic primary Mg2Si have been revealed. As the growth rates of {100} surfaces are diminished by adsorption of Ca element, primary Mg2Si tends to form perfect cube with exposed {100} facets. Moreover, by prudently adjusting the concentration of Ca element, complex polyhedral crystals enclosed by {111} and {100} surfaces were designed and prepared. The results offer valuable insights in designing the modification effect of different modifying elements, which are critical to promoting industrial application of light alloys with improved morphology and refined size of microstructures.

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Publication details

The article was received on 26 Feb 2017, accepted on 15 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7CE00404D
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Growth of Mg2Si crystals shaped by {100} and {111} facets from Al–Mg–Si melts in the presence of calcium

    L. Chen, H. Wang, K. Liu, C. Wang, D. Luo and Q. Jiang, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00404D

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