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一、前 言 近十年来,铝合金的应力腐蚀开裂(简称SCC)问题,引起了国内外的广泛注意。国外对于超高强度的Al-Zn-Mg-Cu系合金(如美国的7075合金),在热处理制度、电化学腐蚀机理、金属显微组织等方面都作过较多的研究,并取得了一些成果。对于高强度Al-CU-Mg系合金,只见到部分应力腐蚀断裂的数据,详细报道较少。 本文以Al-Cu-Mg-Si系的LD10铝合金(类似美国2014、苏联AK8合金)为对象,详细研究了不同时效制度和显微组织对应力腐蚀
I. Introduction In the recent ten years, the stress corrosion cracking (SCC) of aluminum alloy has aroused extensive attention at home and abroad. Abroad for ultra-high strength Al-Zn-Mg-Cu alloy (such as the United States, 7075 alloy), in the heat treatment system, electrochemical corrosion mechanism, metal microstructure made more research and made some Results. For high-strength Al-CU-Mg alloys, only saw some of the stress corrosion cracking data, reported in detail less. In this paper, Al-Cu-Mg-Si series of LD10 aluminum alloy (similar to the United States in 2014, the Soviet Union AK8 alloy) as the object, a detailed study of different aging regime and microstructure of stress corrosion