Grain Refinement of AZ91D Magnesium Alloy by In Situ Al₄C₃ Particles

Abstract:

Experiments were conducted to fabricate the Al₄C3 particles by powder in-situ synthesis process under argon atmosphere and examine the grain refinement of AZ91D magnesium alloy with the addition of 0.6%Al₄C₃(hereafter in mass fraction,%). By means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), the results show the successful fabrication of Al₄C₃ particles. After adding 0.6%Al₄C₃, the average grain size of AZ91D magnesium alloy decreased from 360μm to 243μm. Based on the differential thermal analysis (DTA) results and calculations of the planar disregistry between Al₄C3 and α-Mg, Al₄C3 particles located in the central regions of magnesium grains can act as the heterogeneous nucleus of primary α-Mg phase.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 429-432
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.429
• Online since: August 2011
• Authors: Hui Han, Hua Ming Miao, Sheng Fa Liu, Yang Chen
• Keywords: Al₄C₃, AZ91D Magnesium Alloy, Grain Refinement, Nucleus

References

[1] M.B. Yang, F.S. Pan, R.J. Chen and A.T. Tang, Effects of solutionized Al–10Sr master alloys on grain refinement of AZ31 magnesium alloy, J. Alloys Compd. 461 (2008) 298-303.

DOI: 10.1016/j.jallcom.2007.06.124

[2] J. Du, J. Yang, M. Kuwabara, W.F. Li and J.H. Peng, Improvement of grain refining efficiency for Mg–Al alloy modified by the combination of carbon and calcium, J. Alloys Compd. 470 (2009) 134-140.

DOI: 10.1016/j.jallcom.2008.02.052

[3] M. Kimy, L. Wang and B.S. You, Grain refinement of Mg–Al cast alloy by the addition of manganese carbonate, J. Alloys Compd. 490 (2010) 695-699.

DOI: 10.1016/j.jallcom.2009.10.141

[4] E. Yano, Y. Tamura and T. Motegi, Effect of carbon powder on grain refinement of an AZ91E magnesium alloy, J. JILM, 51 (2001) 599-603.

DOI: 10.2320/matertrans.44.107

[5] Y.H. Liu, X.F. Liu and X.F. Bian, Grain refinement of Mg-Al alloys with Al4C3-SiC/Al master alloy, Mater. Lett. 58 (2004) 1282-1287.

DOI: 10.1016/j.matlet.2003.09.022

[6] G. Han, X.F. Liu and H.M. Ding, Grain refinement of Mg–Al based alloys by a new Al–C master alloy, J. Alloys Compd. 467 (2009) 202-207.

DOI: 10.1016/j.jallcom.2007.12.013

[7] M.A. Easton, A. Schiffl, J.Y. Yao and H. Kaufmann, Grain refinement of Mg–Al(–Mn) alloys by SiC additions, Scripta Mater. 55 (2006) 379-382.

DOI: 10.1016/j.scriptamat.2006.04.014

[8] S. Nimityongskul, M. Jones, H. Choi, R. Lakes, S. Kou and X.C. Li, Grain refining mechanisms in Mg–Al alloys with Al4C3 microparticles, Mater. Sci. Eng. A 527 (2010) 2104-2111.

DOI: 10.1016/j.msea.2009.12.030

[9] M.A. Easton and D.H. Stjohn, A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particles, Acta Mater. 49 (2001) 1867-1878.

DOI: 10.1016/s1359-6454(00)00368-2

[10] S.F. Liu, Y. Zhang and H. Han, Role of manganese on the grain refining efficiency of AZ91D magnesium alloy refined by Al4C3, J. Alloys Compd. 491 (2010) 325-329.

DOI: 10.1016/j.jallcom.2009.10.161

[11] B.L. Bramffit, The effect of carbide and nitride additions on the heterogeneous nucleation behavior of liquid iron, Metall. Trans. 1 (1970) 1987-1995.

DOI: 10.1007/bf02642799