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借助透射电镜观察铝合金的薄膜显微组织,目前国内尚未普遍开展。近年来,我们对这一工作做了初步的尝试。本文叙述了“919”铝合金(Al-Zn-Mg系铝合金)薄膜显微组织的实验研究方法,并详细探讨了该合金的热处理制度、薄膜显微组织和应力腐蚀抗力三者之间的关系。通过实验研究发现晶界析出质点的大小、数量和间距是影响合金抗应力腐蚀性能的主导因素。这一实验研究的成功,对控制合金的质量与选择合理的热处理制度以确保“919”合金在使用中安全可靠,是颇有指导意义的。 文章还介绍了六方晶系物相的电子衍射计算分析方法,并且确定了“919”合金的上述晶界析出质点为η相(MgZn_2)。
With transmission electron microscopy of aluminum alloy film microstructure, the current domestic has not yet been carried out. In recent years, we have made preliminary attempts to this work. This paper describes the experimental study of the microstructure of the “919” aluminum alloy (Al-Zn-Mg aluminum alloy) film and discusses the heat treatment system, the microstructure of the film and the stress corrosion resistance between the three relationship. The experimental results show that the size, number and spacing of precipitated particles in the grain boundaries are the main factors affecting the stress corrosion resistance of the alloy. The success of this experimental study, it is instructive to control the quality of the alloy and choose a reasonable heat treatment system to ensure that the “919” alloy in the use of safe and reliable. The article also introduced the calculation and analysis method of the electronic diffraction of the hexagonal crystal phase, and determined that the above grain boundary precipitates of the “919” alloy are η phase (MgZn_2).