Effect of Aging on Damping Capacity of AZ91 Alloy


Article Preview

Changes in microstructure and damping capacity with aging time for solutionized AZ91 (Mg-9%Al-1%Zn-0.2%Mn) alloy have been investigated based on experimental results from optical micrography, X-ray diffractometry, hardness test and damping capacity measurement vibrating in a flexural mode. Discontinuous β (Mg17Al12) precipitates form along the primary grain boundaries, the amount of which increases as the aging time increases. The hardness of α matrix with respect to aging shows a typical “S” shape, indicating a generation of fine continuous precipitation in the matrix during aging. The peak level of damping capacity for the AZ91 alloy is obtained after 1 hour of aging, over which the damping capacity becomes deteriorated continuously. The optimum density of continuous β precipitates with fine morphology, which may well act as pinning points for dislocation lines, might be responsible for the improvement of damping capacity.



Materials Science Forum (Volumes 544-545)

Edited by:

Hyungsun Kim, Junichi Hojo and Soo Wohn Lee




J. H. Jun et al., "Effect of Aging on Damping Capacity of AZ91 Alloy", Materials Science Forum, Vols. 544-545, pp. 235-238, 2007

Online since:

May 2007




[1] G.F. Weissmann: Proc. ASTM Vol. 58 (1958), p.869.

[2] K. Sugimoto: Mem. Inst. Sci. Ind. Res. Osaka Univ. Vol. 35 (1978), p.31.

[3] J.B. Clark: Acta Metall. Vol. 16 (1968), p.141.

[4] A.F. Crawley and B. Lagowski: Metall. Trans. Vol. 5 (1974), p.949.

[5] D. Duly and Y. Brechet: Acta Mater. Vol. 42 (1994), p.3036.

[6] J.H. Jun and C.S. Choi: Scripta Mater. Vol. 38 (1998), p.543.

[7] K. Kawahara, N. Sakura and Y. Nishizaki: J. Jpn. Inst. Met. Vol. 57 (1993), p. (1989).

[8] S. Celloto: Acta Mater. Vol. 48 (2000), p.1795.

[9] A. Granato and K. Lücke: J. Appl. Phys. Vol. 27 (1956), p.583.