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

Jian Ping Li; Gordon W. Lorimer; Joseph D. Robson; B. Davis

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

Paper Titles

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Investigation on the Alloy Phases in As-Aged ZK60 Magnesium Alloy
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Texture, Microstructure and Strain Sensibility in Compressed Magnesium Alloys
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Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys
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Orientation Dependence of Ductility of Mg Single Crystals at Elevated Temperature
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Effects of Silicon and AlP on Microstructure and Properties of Mg-8Zn-4Al-0.3Mn Alloy
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The Influence of Electric Current Pulses on the Microstructure of Magnesium Alloy AZ91D
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Effects of Al/Zn Ratio on the Microstructure and Strengthening of Mg-Al-Zn Alloys
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Investigation on Microstructures of Heat Treated Mg-Zr and Mg-Mn Alloys

Abstract:

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.