Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys

Abstract:

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The microstructure of three dilute Mg-Mn and two dilute Mg-Zr alloys which had been heat treated at different temperatures and times were studied using optical microscopy and various electron optical techniques, including FEGSEM and TEM. It was found that the Mg-Zr alloys homogenized at 500°C and annealed at 350°C contained a fine dispersion of Zr-containing particles at grain boundaries and within grains. In contrast, annealing Mg-Zr alloys at 300°C for up to 3 h led to little modification of the as-cast structures. When the Mn content was less than 0.9 weight percent, homogenization of the Mg-Mn alloys at 550 to 600°C resulted in the dissolution of small rod-like and needle-shape particles, which then grown up as fine particles when aged at 300°C. Mg- 0.6Mn and Mg-0.9Mn alloys annealed at 300 to 400°C without solution treatment contained a large volume fraction of nano-sized precipitates.

Info:

Periodical:

Materials Science Forum (Volumes 488-489)

Edited by:

W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo

Pages:

189-192

DOI:

10.4028/www.scientific.net/MSF.488-489.189

Citation:

J. P. Li et al., "Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys", Materials Science Forum, Vols. 488-489, pp. 189-192, 2005

Online since:

July 2005

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Price:

$35.00

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