主观散斑方法在微观观测铝合金应力腐蚀演化过程中的应用

An application of subjective speckle technique for microcosmic observation of evolvement of stress corrosion of aluminum alloy

建立了监测应力腐蚀萌生过程的光学系统,介绍了主观散斑方法在应力腐蚀检测过程中的应用。这种方法将散射方法与散斑统计相结合,通过计算表面应力腐蚀引起的粗糙度的变化,研究应力腐蚀的初始演化过程。将此方法应用到铝合金2024-T3在3.5％NaCl溶液中的应力腐蚀萌生实验中,结果表明,这种方法对粗糙度的变化足够敏感,特别是散斑场的平均光强与粗糙度基本是线性关系。如果用粗糙度来表征腐蚀速度,则可以用这种方法简单、有效的研究各种因素对应力腐蚀萌生的影响。

An optical system has been set up to observe the initial process of stress corrosion, the application of the subjective speckle technique in observation of stress corrosion has been introduced. This method combined scatter and statistical speckle techniques; through computing the microstructure changes of roughness caused by stress corrosion studied initial process of stress corrosion. This method is applied in stress corrosion initial evolvement experiment of aluminum alloy Al2024-T3 board in 3.5% sodium chloride solution. the results showed that this method is sensitive enough for measurement of roughness, computing the average intensity of spackle-patterns is a easy and effectual method for studying the influence of each condition to the initial process of stress corrosion.