Microstructure and mechanical properties of Mg-Al alloys with in situ Al₄C₃ phase synthesised by CO₂ incorporation during liquid state processing
by S. Jayalakshmi; Q. Dezhi; S. Sankaranarayanan; M. Gupta
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 8, No. 4/5, 2013

Abstract: In this work, Mg-Al alloys containing 7 wt.% and 9 wt.% Al were synthesised by the incorporation of carbon dioxide during casting, using the disintegrated melt deposition technique and were characterised after extrusion. Microstructural studies revealed fine-grained structure and phase analyses of Mg-7Al-CO₂ and Mg-9Al-CO₂ showed the presence of Al₄C₃ phase formed in situ during processing. Evaluation of mechanical properties of these alloys phase showed improvements in hardness, yield strength and ultimate tensile strength when compared to those without the incorporation of CO₂. The observed enhancement in mechanical properties was attributed to the dispersion strengthening effect brought forth by the in situ Al₄C₃ phase. Based on the processing-structure-property correlation, the significant influence of CO₂ incorporation and the processing methods on the microstructural and mechanical properties of the alloys are discussed.

Online publication date: Mon, 07-Oct-2013

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