Solid–Liquid Diffusion and Phase Growth Kinetics in Mg-Ca Binary System

Abstract:

The solid–liquid diffusion between Mg and Mg-10 at.% Ca alloy was studied at a temperature range of 570°C to 630°C for 10, 20, 30min, respectively. Only one compound, Mg₂Ca, was observed in the diffusion couples. As the diffusion time increased, the dendritic structure of the diffusion layer became coarser. The thickness of the diffusion layer had an exponential relation to the experimental temperature. The Mg₂Ca phase was observed to follow parabolic growth with diffusion time, which suggested that the growth of the Mg₂Ca phase was controlled by diffusion mechanism. The activation energy was determined to be 111.28 kJ/mol.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 418-423
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.418
• Online since: April 2015
• Authors: Xin Li, Bin Jiang*, Hong Yang, Xiang Sheng Xia, Jia Hong Dai, Fu Sheng Pan
• Keywords: Calcium, Growth Kinetics, Magnesium, Microstructure, Solid–Liquid Diffusion

References

[1] P. Fusheng, H. Enhou, High Performance Wrought Magnesium Alloys and their processes, China Science Press, (2007).

[2] Q.S. Yang, B. Jiang, X. Li, H.W. Dong, W.J. Liu and F.S. Pan, Microstructure and mechanical behavior of the Mg-Mn-Ce magnesium alloy sheets, J. Magnes. Alloy. 2(2014) 8-12.

DOI: 10.1016/j.jma.2014.01.009

[3] B. Jiang, W.J. Liu and D. Qiu, Grain refinement of Ca addition in a twin-roll-cast Mg-3Al-1Zn alloy, Mater. Chem. Phys. 133(2012) 611-616.

DOI: 10.1016/j.matchemphys.2011.12.087

[4] A.A. Luo, M.P. Balogh and B.R. Powell, Creep and microstructure of magnesium-aluminum-calcium based alloys, Metall. Mater. Trans. A. 33(2002) 567-574.

DOI: 10.1007/s11661-002-0118-1

[5] R. Ninomiya, T. Ojiro and K. Kubota, Improved heat resistance of Mg-Al alloys by the Ca addition, Acta Metall. Mater. 43(1995) 669-674.

DOI: 10.1016/0956-7151(94)00269-n

[6] M. Terada, R. Sota, N. Ishimatsu, T. Sato and K. Ohori, A thousandfold creep strengthening by Ca addition in die-cast AM50 magnesium alloy , Metall. Mater. Trans. A. 35(2004) 3029-3032.

DOI: 10.1007/s11661-004-0046-3

[7] A. Suzuki, N.D. Saddock, J.W. Jones and T.M. Pollock, Solidification paths and eutectic intermetallic phases in Mg–Al–Ca ternary alloys, Acta Materialia. 53(2005) 2823-2834.

DOI: 10.1016/j.actamat.2005.03.001

[8] S. Brennan, A.P. Warren, K.R. Coffey, N. Kulkarni, P. Todd, M. Kilmov and Y. Sohn, Aluminum Impurity Diffusion in Magnesium, J. Phase Equilib. Diff. 33(2012) 121-125.

DOI: 10.1007/s11669-012-0007-2

[9] J.O. Andersson, T. Helander, L. Hoglund, P. Shi, and B. Sundman, THERMO-CALC & DICTRA computational tools for materials science, Calphad. 26(2002) 273-312.

DOI: 10.1016/s0364-5916(02)00037-8

[10] W. Cao, S.L. Chen, F. Zhang, K. Wu, Y. Yang, Y.A. Chang, R. Schmid-Fetzer, and W.A. Oates, PANDAT software with PanEngine, PanOptimizer and PanPrecipitation for multi-component phase diagram calculation and materials property simulation, CALPHAD. 33(2009).

DOI: 10.1016/j.calphad.2008.08.004

[11] X. Zhang, D. Kevorkov and M.O. Pekguleryuz, Study on the intermetallic phases in the Mg-Ce system Part II. Diffusion couple investigation, J. Alloy Compd. 501(2010) 366-370.

DOI: 10.1016/j.jallcom.2010.04.107

[12] A.A. Nayeb-Hashemi and J.B. Clark, Bull Alloy Phase Diagrams. 8(1987) 65.

[13] K.N. Kulkarni and A.A. Luo, Interdiffusion and Phase Growth Kinetics in Magnesium-Aluminum Binary System, J. Phase Equilib. Diff. 34(2013) 104-115.

DOI: 10.1007/s11669-013-0189-2