摘要
研究了热处理制度和时效工艺的改变对Al-Zn-Mg系铝合金的组织结构、力学性能和应力腐 蚀性能的影响。研究结果表明:高温预析出可以改变Al-Zn-Mg系铝合金晶界的析出相大小和分 布,从而改善其抗应力腐蚀性能;在T6和T612种人工时效条件下,预析出的合金的抗应力腐蚀 性能均好于无预析出的合金。在自然时效状态下,引入超声波,对无预析出合金的应力腐蚀性能 进行了初步探索,发现超声波可以提高合金的抗应力腐蚀性能,而对合金的硬度无影响。
LC52 is a kind of weldable aluminum with medium-strength. The properties, such as tensile property at room temperature, hardness, electrical resistivity, stress corrossion cracking (SCC) and microstructure were systematically studied with different heat treatment and ageing. Transmission electron microscopy (TEM) revealed that high-temperature pre-precipitation can limit precipitation to grain boundary, and can change the size and distributing of the precipitate phases. Therefore it can enhance the resistance to stress corrosion cracking of Al-Zn-Mg aluminum alloys. The results of SCC show that the stress corrosion cracking resistance of aged alloys (T6 and T61) could be improved with non-deteriorated strength and plasticity via the pre-precipitation above 400℃. At the same time, SCC at natural aging was investigated by using ultrasonic vibrations. It was proved that ultrasonic vibrations can improve SCC and has no effect on the hardness.
出处
《粉末冶金材料科学与工程》
EI
2004年第2期168-173,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家重点基础研究发展规划项目(G1999064900)国家武器装备预先研究项目(41312020205)
