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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of ultrasonic treatment on the tensile properties and microstructure of twin roll casting Mg-3%Al-l%Zn-0.8%Ce-0.3%Mn (wt%) alloy strips
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Effects of ultrasonic treatment on the tensile properties and microstructure of twin roll casting Mg-3%Al-l%Zn-0.8%Ce-0.3%Mn (wt%) alloy strips

机译：超声处理对双辊铸造Mg-3％Al-1％Zn-0.8％Ce-0.3％Mn（wt％）合金带材拉伸性能和组织的影响

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摘要

Twin roll casted Mg-3%Al-l%Zn-0.8%Ce-0.3%Mn alloy strips with thicknesses of approximately 3.6-4 mm are prepared, and the effects of ultrasonic treatment on their tensile properties and microstructure are investigated. The results show that, after treatment with an ultrasonic power of 800 W, the grain size of alpha-Mg decreased from 136.3 mum to 44.7 mum, and the morphology changed from dendritic to globular. Grain multiplication by fragmentation of dendrites and cavitation-induced heterogeneous nucleation are the mechanisms of refinement of the a-Mg grains by ultrasonic treatment. The needle-like shaped intermetallic MgAlCeMn is modified by ultrasonic treatment and obtains a more globular shape with finer particles. This change was a result of undercooling created by the cavitation of ultrasonic treatment. This improved microstructure contributes to an increase in both tensile strength and elongation of twin roll casting magnesium alloy. The yield strength of the experimental alloy strips subjected to 800 W ultrasonic treatment is approximate 30% higher than that of alloy without ultrasonic treatment. Furthermore, the elongation of experimental alloy is almost double that of alloy without ultrasonic treatment. The relationship between the yield strength and the refined grain size of the experimental alloy can be expressed by the Hall-Petch equation sigma_y=74.8 +31.4 × d~(-1/2).
机译：制备厚度约为3.6-4mm的双铸Mg-3％Al-1％Zn-0.8％Ce-0.3％Mn合金带，并研究了超声处理对其拉伸性能和显微组织的影响。结果表明，经800 W超声波处理后，α-Mg晶粒尺寸从136.3μm减小到44.7μm，形貌由树枝状变为球状。通过树枝状晶体的破碎和空化诱导的异质成核，晶粒的增殖是通过超声处理细化α-Mg晶粒的机制。针状金属间化合物MgAlCeMn经过超声处理而改性，获得了更细的颗粒状的球形。这种变化是由于超声处理的空化而产生的过冷的结果。这种改进的微观结构有助于双辊铸造镁合金的拉伸强度和伸长率的增加。经过800 W超声处理的实验合金带材的屈服强度比未经超声处理的合金的屈服强度高约30％。此外，实验合金的伸长率几乎是未经超声处理的合金的伸长率的两倍。实验合金的屈服强度与细化晶粒尺寸之间的关系可以用Hall-Petch方程sigma_y = 74.8 +31.4×d〜（-1/2）表示。

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