Grain refinement of Ca addition in a twin-roll-cast Mg-3Al-1Zn alloy

Jiang, B, Liu, W, Qiu, D and Pan, F 2012, 'Grain refinement of Ca addition in a twin-roll-cast Mg-3Al-1Zn alloy', Materials Chemistry and Physics, vol. 133, no. 23, pp. 611-616.


Document type: Journal Article
Collection: Journal Articles

Title Grain refinement of Ca addition in a twin-roll-cast Mg-3Al-1Zn alloy
Author(s) Jiang, B
Liu, W
Qiu, D
Pan, F
Year 2012
Journal name Materials Chemistry and Physics
Volume number 133
Issue number 23
Start page 611
End page 616
Total pages 6
Publisher Elsevier S.A.
Abstract Addition of 0.08 wt% Ca into AZ31 melts significantly reduces the average grain size of thin strips produced by twin-roll-cast to 30 mu m from 100 mu m. Like Zr, due to the high chemical activity, the Ca added into the melts reacts with Al and forms Al2Ca intermetallic compound. X-ray diffraction result approves the existence of Al2Ca in the thin strips, which formed in the melts. Crystallographic examination of relationship between Al2Ca and Mg using the edge-to-edge matching model indicates that Al2Ca particles are effective inoculants for heterogeneous nucleation of Mg. It is considered that Al2Ca is a potential and effective grain refiner for Mg alloys and the grain refinement through addition of Ca in the AZ31 alloy is attributed to the inoculation effect of Al2Ca particles formed in the melts.
Subject Metals and Alloy Materials
Keyword(s) Alloy
Crystallography
Microstructure
Nucleation
DOI - identifier 10.1016/j.matchemphys.2011.12.087
Copyright notice © 2012 Elsevier B. V. All rights reserved.
ISSN 0254-0584
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