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研究2124铝合金在蠕变时效过程中工艺参数对力学性能和微观组织的影响。结果表明,蠕变量和蠕变速率随着时效时间、温度、应力的增大而增大。硬度随着时间和应力的增加呈类似于先增加后减小的趋势。在实验温度185~195°C范围内,温度对硬度的影响不大。当蠕变条件为200 MPa、185°C、8 h时,试样得到最佳的力学性能,此时试样基体内同时存在强化相S"相和S’相。透射电镜观察表明外加应力能促进析出相的析出和长大,基体中没有发现明显的应力位向效应。
The effect of technological parameters on mechanical properties and microstructure of 2124 aluminum alloy during creep aging was investigated. The results show that creep rate and creep rate increase with aging time, temperature and stress. Hardness increases with time and stress similar to the first increase and then decrease. In the experimental temperature 185 ~ 195 ° C range, the temperature has little effect on the hardness. When the creep condition is 200 MPa, 185 ° C, 8 h, the best mechanical properties of the sample are obtained, and the strengthening phase S ’phase and the S’ phase exist in the sample matrix at the same time.The TEM observations show that the applied stress It can promote the precipitation and growth of precipitated phase, and no obvious stress orientation effect is found in the matrix.