Abstract

The aim of this study is to investigate the AZ31 alloy powder production and characterization processes experimentally using the gas atomization method. For this purpose, firstly, the design and production of gas atomization units were done at Karabük University Faculty of Technology Department of Manufacturing Engineering. In this gas atomization unit, the manufacturability of AZ31 powder from magnesium alloys was investigated by the gas atomization method which is one of the production methods by powder metallurgy. The parameters and the literature used in the production of materials similar to the AZ31 alloy are taken into account as producibility parameters. In the gas atomization method, parameters such as nozzle diameter, gas pressure, and temperature must be controlled in order to produce the desired properties in metal powder production. The diameter of the nozzle is crucial because it affects the gas pressure and temperature, the size of the powder, and the shape of the powders. Experimental studies were carried out using 3 different temperatures (790, 820, and 850°C), 4 different nozzle diameters (2, 3, 4, and 5 mm) and 4 different gas pressures (5, 15, 25, and 35 bar). In the molten metal atomization process and in the process of forming a protective gas atmosphere, argon gas was preferred. Scanning electron microscopy (SEM) was used to determine the shape of the AZ31 powders produced, XRD, XRF, and SEM-EDX analyses were used to determine the phases in the internals of the produced powders and percentages of these phases. Laser measurement devices were used for powder size analysis and hardness tests were performed to determine the mechanical properties of the produced powders. The powders produced were pressed into masses at 4 different pressing pressures (300, 400, 500, and 600 MPa). The best sinterability values of the bulked powders and sintering process were performed at 3 different temperatures (500, 550, and 600°C). Density measurements were made after pressing and sintering the powders. As a result of the experimental studies, it was found that the powder size decreased with the increase of the gas pressure but the nozzle diameter, and the powder shape changed to the dripping and the spherical in the ligament and complex form. It has been observed that the temperature has no significant effect on the powder size and shape.

中文翻译：

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气雾法制备AZ31合金及其性能

摘要

这项研究的目的是使用气体雾化方法实验性地研究AZ31合金粉末的生产和表征过程。为此，首先，在卡拉布克大学技术学院制造工程系进行了气体雾化装置的设计和生产。在该气体雾化单元中，通过气体雾化方法研究了镁合金制成的AZ31粉末的可制造性，该方法是粉末冶金的生产方法之一。将与AZ31合金相似的材料的生产中使用的参数和文献考虑为可生产性参数。在气体雾化方法中，必须控制诸如喷嘴直径，气体压力和温度之类的参数，以便在金属粉末生产中产生所需的性能。喷嘴的直径至关重要，因为它会影响气体压力和温度，粉末的尺寸以及粉末的形状。使用3种不同的温度（790、820和850°C），4种不同的喷嘴直径（2、3、4和5 mm）和4种不同的气体压力（5、15、25和35 bar）进行了实验研究）。在熔融金属雾化过程中和在形成保护气体气氛的过程中，优选氩气。扫描电子显微镜（SEM）用于确定所生产的AZ31粉末的形状，XRD，XRF和SEM-EDX分析用于确定所生产的粉末内部的相和这些相的百分比。使用激光测量设备进行粉末尺寸分析，并进行硬度测试以确定所生产粉末的机械性能。将产生的粉末在4种不同的压制压力（300、400、500和600 MPa）下压成团块。在3个不同的温度（500、550和600°C）下，进行了散装粉末和烧结工艺的最佳烧结性值。在压制和烧结粉末之后进行密度测量。实验研究的结果发现，粉末的尺寸随着气压的增加而减小，但随着喷嘴直径的增加而减小，并且粉末的形状以韧带和复合物的形式变为滴落状和球形。已经观察到温度对粉末尺寸和形状没有显着影响。在3个不同的温度（500、550和600°C）下，进行了散装粉末和烧结工艺的最佳烧结性值。在压制和烧结粉末之后进行密度测量。实验研究的结果发现，粉末的尺寸随着气压的增加而减小，但随着喷嘴直径的增加而减小，并且粉末的形状以韧带和复合物的形式变为滴落状和球形。已经观察到温度对粉末尺寸和形状没有显着影响。在3个不同的温度（500、550和600°C）下，进行了散装粉末和烧结工艺的最佳烧结性能值。在压制和烧结粉末之后进行密度测量。实验研究的结果发现，粉末的尺寸随着气压的增加而减小，但随着喷嘴直径的增加而减小，并且粉末的形状以韧带和复合物的形式变为滴落状和球形。已经观察到温度对粉末尺寸和形状没有显着影响。粉末状变为韧带状和复杂形式的滴状和球形。已经观察到温度对粉末尺寸和形状没有显着影响。粉末状变为韧带状和复杂形式的滴状和球形。已经观察到温度对粉末尺寸和形状没有显着影响。