Effect of Strong Magnetic Field on the Discontinuous and Continuous Precipitation in AZ91 Mg Alloy

Abstract:

A strong static magnetic field (SSMF) of about 10 T was introduced to the aging process of AZ91 magnesium alloy. Comparing with conventional aging, in the first stage of aging with SSMF, discontinuous precipitation of Mg17Al12 at grain boundary was accelerated. The magnetically induced grain boundary migration might be responsible for this acceleration effect. The density of the Mg17Al12 continuous precipitates inside the grains was increased and the precipitation plates became thinner in SSMF pre-aged specimens, which might be ascribed to the retarded volume diffusion resulted from the SSMF.

• Periodical: Materials Science Forum (Volumes 488-489)
• Pages: 849-852
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.488-489.849
• Online since: July 2005
• Authors: Jie Dong, Z.F. Li, Xiao Qin Zeng, Chen Lu, Wen Jiang Ding
• Keywords: Continuous Precipitation, Discontinuous Precipitation, Grain Boundary Migration, Strong Magnetic Field

References

[1] C. C. Koch: Mater. Sci. Eng. Vol. A 287 (2000), p.213.

[2] D.A. Molodov, A.D. Sheikh-Ali: Acta Meter (2004). (In press).

[3] D. A. Molodov, G. Gottstein: Scripta Mater. Vol. 37 (1997), p.1207.

[4] D. A. Molodov, G. Gottstein: Acta Mater. Vol. 46 (1998), p.5627.

[5] A. D. Sheikh-Ali, D. A. Molodov: Scripta Mater. Vol. 48 (2003), p.483.

[6] WW. Mullins: Acta Metall. Vol. 4 (1956), p.421.

[7] A. Luo, M. O. Pekguleryuz: J. Mater. Sci. Vol. 29 (1994), p.5259.

[8] S. Celotto: Acta Meter. Vol. 48 (2002), p.1775.

[9] Z.F. Li, J. Dong, submitted to TMS Magnesium Annals (2005).

[10] K.N. Tu, D. Turnbull, Acta Metall. Vol. 15 (1967), p.369.

[11] G.R. Purdy, N. Lange, in Decomposition of alloys (1984): the Early Stages (edited by P. Haasen et al. ), p.214. Pergamon Press, Oxford.

[12] R.A. Fournelle, J. B. Clark, Metall. Trans. Vol. 3 (1972), p.2757.

[13] D. Duly, Y. Brechet, Acta Metall. Mater. Vol. 42 (1994), p.3035.