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1.前言由于高强度的A-Zn-Mg(7000系列)合金具有强度高、重量比大、成本低、可成型性良好等特点,所以它已经广泛地应用于飞机机体结构上。尽管它们的抗拉性能大大好于其它铝合金系列,但是疲劳特性还不是很显著的.为了同时提高抗拉性能和疲劳特性,在最近三十年内巳经采取了许多途径去研究这个问题,包括使用了扫描电子显微镜对疲劳裂纹进行检查,能更好了解疲劳特性.2.实验步骤试验材料系7475铝合金,它是一种含有铁、硅成份的高纯度Al-Zu-Mg合金,标
1. Introduction Because A-Zn-Mg (7000 series) high-strength alloy with high strength, weight ratio, low cost, good formability and other characteristics, it has been widely used in aircraft body structure. Although their tensile properties are significantly better than those of other aluminum alloys, the fatigue characteristics are not significant, and in order to improve both tensile and fatigue properties, there have been many ways to address this issue in the last three decades, including The use of a scanning electron microscope for fatigue crack inspection, can better understand the fatigue characteristics .2 experimental procedures Test material 7475 aluminum alloy, which is a high purity Al-Zu-Mg alloy containing iron, silicon composition, standard