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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Improvements in mechanical and stress corrosion cracking properties in Al-alloy 7075 via retrogression and reaging
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Improvements in mechanical and stress corrosion cracking properties in Al-alloy 7075 via retrogression and reaging

机译：通过逆行和时效改善铝合金7075的机械应力腐蚀开裂性能

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摘要

Aluminum alloy 7075 has been widely studied, due to its excellent mechanical properties developed by age hardening and their extensive uses in the aircraft structure. Tensile test specimens were tested in various preaging conditions (100, 120, 140 ℃) and various retrogression temperatures T_7(160, 180, 200 ℃) in order to evaluate the effect of heating cycles on the mechanical as well as corrosion properties. The optimum condition was preaging at T_6 120 ℃ and retrogressing at T_7 200 ℃, which gave the highest hardness and tensile properties. The corrosion behavior of three-point-loaded specimens after 7 days of immersion in 3.5% NaCl solution, using modified electrochemical cell, was studied. The most resisting condition for SCC was preaging at T_6 = 100 ℃ and retrogression at T_7 = 160 ℃ for 250 min. Specimens retrogressed at 200 ℃ for 8 min showed low resistance to stress corrosion cracking.
机译：铝合金7075由于其通过时效硬化而发展出的优异机械性能及其在飞机结构中的广泛应用而受到了广泛的研究。在不同的时效条件（100、120、140℃）和回归温度T_7（160、180、200℃）下对拉伸试样进行测试，以评估加热循环对机械性能和腐蚀性能的影响。最佳条件是在T_6 120℃时效时效，在T_7 200℃时效时效，从而获得最高的硬度和拉伸性能。使用改良的电化学电池，研究了在3.5％NaCl溶液中浸泡7天后三点加载的试样的腐蚀行为。 SCC的最大抵抗条件是在T_6 = 100℃时效预老化，在T_7 = 160℃时效250分钟。标本在200℃下回火8 min表现出较低的抗应力腐蚀开裂性。

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