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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Analysis and Rheological Behavior of Magnesium Alloys at Semi-solid Temperature Range
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Microstructure Analysis and Rheological Behavior of Magnesium Alloys at Semi-solid Temperature Range

机译：半固体温度范围内镁合金的微观结构分析及流变行为

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摘要

Microstructure and rheological properties of AZ91 and Elektron 21 magnesium alloys in semi-solid state were studied. Differential scanning calorimetry revealed significant differences in melting range in analyzed materials. Isothermal annealing for 5, 30 and 80?min, in semi-solid range, corresponding to 50 and 70% of solid fraction, showed slower microstructure coarsening kinetics in Elektron 21 due to the presence of Zr- and RE-enriched precipitations. Ostwald ripening and coalescence resulted in decrease in grains density with increasing annealing time and temperature. Hardness after annealing showed overall tendency to diminish with soaking time probably due to the growth of average grain size. Rheological analysis showed tendency to lower the value of dynamic viscosity coefficient as shear rate rise, which confirmed non-Newtonian flow behavior. The highest values of dynamic viscosity coefficient were obtained for alloy AZ91.
机译：研究了AZ91和Elektron 21镁合金在半固态中的微观结构和流变性质。 差分扫描量热法显示出分析材料熔化范围的显着差异。 等温退火5,30和80？min，在半固体范围内，对应于50％和70％的固体级分，由于存在Zr-和再富集沉淀而在Elektron 21中显示出较慢的微观结构粗化动力学。 OSTWALD成熟和聚结导致晶粒密度的降低随着退火时间和温度的增加。 退火后的硬度表明，由于平均晶粒尺寸的增长，浸泡时间均达到整体趋势。 流变学分析表明，降低动态粘度系数的值作为剪切速率上升，这证实了非牛顿流动行为。 为合金AZ91获得动态粘度系数的最高值。

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