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The microstructural evolution of a pre-alloyed AZ91 magnesium alloy powder through high-energy milling and subsequent isothermal annealing

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URI: https://hdl.handle.net/10016/20453
ISSN: 0167-577X
DOI: https://doi.org/10.1016/j.matlet.2013.02.052
UXXI: AR/0000013462
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microstructural_torralba_ML_2013_ps.pdf (385.39 KB)
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2013-05
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Elsevier
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This study analyzed the effect of high-energy milling (HEM) and subsequent isothermal annealing on the microstructural characteristics of a pre-alloyed AZ91 Mg alloy powder. To this end, the mentioned powder was milled for 14 h using a horizontal attritor. Then, the mechanically milled powder was isothermally annealed at temperatures ranging from 200 degrees C to 500 degrees C for I h up to 4 h in an Ar atmosphere. HEM caused the β-Mg₁₇Al₁₂ phase present in the microstructure of AZ91 powder particles to dissolve into their alpha-Mg solid solution matrix. In addition, the crystallite size of the alpha-Mg phase decreased to 25 nm through HEM. In contrast to the annealing time, the temperature of isothermal annealing had a significant effect on the microstructural features of the mechanically milled AZ91 powder.
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AZ91 magnesium alloy, Pre-alloyed powder, High-energy milling, Isothermal annealing, Microstructural evolution
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Materials Letters (2013). 98, 182-185.
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