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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Mechanical Vibration and Grain Refiner on Microstructure and Mechanical Properties of AZ91Mg Alloy during Solidification
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Effect of Mechanical Vibration and Grain Refiner on Microstructure and Mechanical Properties of AZ91Mg Alloy during Solidification

机译：机械振动和晶粒晶粒对AZ91mg合金在凝固过程中的微观结构和力学性能的影响

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摘要

In the present work, microstructure and mechanical properties like hardness, tensile, and wear of AZ91 Mg alloy have been studied for four different samples of the same composition. The first sample was as-cast alloy; the second sample was given only mechanical vibration (15 Hz-2 mm), the third sample by adding 2 wt.% ZnO as a grain refiner, and the fourth sample with a collective effect of grain refiner and the imposition of mechanical vibration during solidification. The optimum results were obtained for the fourth sample, because both mechanical vibrations and grain refiner provide nucleating sites in the melt, resulting in grain growth restriction. Microstructural studies reveal that the combined effect results in fragmentation and uniform distribution of primary alpha-Mg and beta-Mg17Al12 phases. It is witnessed that, among all samples, the fourth sample is showing superior density and mechanical properties when compared with the as-cast sample. Hardness at three different locations (top, middle, and bottom) is increased from 53-72, 55-79, to 58-92 BHN, respectively. Similarly, yield strength, UTS, and % elongation has increased from 90-121 MPa, 140-182 MPa, to 1.8-2.8, respectively. Likewise, the coefficient of friction and specific wear rate at 5 N was decreased from 0.59-0.13 to 1.07-0.43 mm(3)/Nm, respectively, whereas at 10 N load, these were 0.68-0.23 and 1.69-0.47 mm(3)/Nm respectively.
机译：本文研究了AZ91镁合金在相同成分的四种不同试样上的显微组织和硬度、拉伸强度和磨损等力学性能。第一个样品是铸态合金；第二个样品仅进行机械振动（15 Hz-2 mm），第三个样品通过添加2 wt.%ZnO作为晶粒细化剂，第四个样品具有晶粒细化剂的集体效应，并在凝固过程中施加机械振动。对于第四个样品，获得了最佳结果，因为机械振动和晶粒细化剂都在熔体中提供了形核位置，导致晶粒生长受限。微观结构研究表明，综合效应导致初生α-Mg和β-Mg17Al12相碎裂并均匀分布。可以看到，与铸态样品相比，在所有样品中，第四个样品显示出更高的密度和机械性能。三个不同位置（顶部、中部和底部）的硬度分别从53-72、55-79增加到58-92 BHN。同样，屈服强度、UTS和伸长率分别从90-121 MPa、140-182 MPa增加到1.8-2.8。同样，5N下的摩擦系数和比磨损率分别从0.59-0.13降至1.07-0.43 mm（3）/Nm，而10N下的摩擦系数和比磨损率分别为0.68-0.23和1.69-0.47 mm（3）/Nm。

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