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研究了拉伸速率对经固溶+人工时效热处理后的2A40合金拉伸性能的影响。结果表明,2A40合金经固溶+人工时效处理后,随着拉伸速率的增大,其强度逐渐升高,塑性有所降低,显微组织中析出相有所细化。其原因可能是,随着拉伸速率的增大,试样温度升高,在拉伸过程中还有细小的析出相析出;随着变形量的增大,位错快速增殖而缠结及对位错运动阻力导致位错运动阻力增大,引起强度的升高和塑性的降低。
The effect of tensile rate on the tensile properties of 2A40 alloy after solution treatment and artificial aging heat treatment was studied. The results show that the strength of 2A40 alloy increases gradually with the increase of tensile rate after solution treatment and artificial aging treatment, and the plasticity decreases and the precipitated phase in the microstructure is refined. The reason may be that with the increase of the stretching rate, the temperature of the sample increases, and during the stretching process, there are precipitated fine precipitates; as the deformation increases, the dislocations rapidly proliferate and become entangled; and Resistance to dislocation movement leads to increased dislocation resistance, causing increased strength and decreased plasticity.