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Hot tensile and fatigue behaviour of zinc-aluminum alloys produced by gravity and squeeze casting

机译：重力铸造和挤压铸造生产的锌铝合金的热拉伸和疲劳行为

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摘要

The tensile and fatigue properties of zinc-aluminum alloys (ZA-8, ZA-12 and ZA-27) in squeeze and gravity cast forms have been investigated. Tensile tests were conducted at ambient and elevated temperatures up to 150 deg C. At low temperatures, the ultimate tensile strength and yielding strength of the squeeze cast alloys have been found to be superior those of the gravity-cast alloys, as the temperature increased they decreased. In the same way, Brinell hardness of the squeeze cast alloys were obtained at higher values than gravity castings. The fatigue tests were performed at a constant speed of 400 rev/min and under a number of stress levels ranging from 100 to 150 MPa. The fatigue behaviour results of the ZA alloys were similar to obtained from the tensile testing. The squeeze cast alloys exhibited good fatigue resistance in proportion to the gravity castings. Metallography examinations showed that the microstructure of the castings differed according to the method of casting used. It was considered that the mechanical properties of the alloys were affected from these micro-structural changes.
机译：研究了挤压铸造和重力铸造形式的锌铝合金（ZA-8，ZA-12和ZA-27）的拉伸和疲劳性能。拉伸试验在环境温度和高达150摄氏度的高温下进行。在低温下，发现随温度升高，挤压铸造合金的极限拉伸强度和屈服强度优于重力铸造合金。减少。以相同的方式，以比重力铸造更高的值获得了挤压铸造合金的布氏硬度。疲劳测试以400转/分钟的恒定速度进行，并在100至150 MPa的多个应力水平下进行。 ZA合金的疲劳行为结果与通过拉伸试验获得的结果相似。与重力铸造成比例，挤压铸造合金具有良好的抗疲劳性。金相检查表明，铸件的微观结构根据所用铸件的方法而有所不同。认为合金的机械性能受到这些微观结构变化的影响。

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