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通过拉伸测试、硬度测试、扫描电镜以及透射电镜等手段,研究预变形对高纯Al-Cu-Mg合金180°C时效后组织和力学性能的影响。结果表明:与未预变形的样品相比,随着预轧制量的增加,预轧制后样品的峰值硬度值逐渐增加,而达到峰值硬度所需的时间也逐渐缩短。此外,在预变形的合金时效过程中观察到双峰硬化现象。TEM的研究结果表明,经冷轧变形的合金随着预变形量的提高,合金中S′(Al_2CuMg)相的密度增大,尺寸减小,这种高密度、细小的S′相以及高密度位错是导致合金峰值硬度和强度提高的主要原因。
The effects of pre-deformation on the microstructure and mechanical properties of Al-Cu-Mg alloy after aging at 180 ° C were studied by means of tensile test, hardness test, SEM and TEM. The results show that the peak hardness value of the pre-rolled samples increases gradually with the increase of the pre-rolling amount compared with the non-pre-deformed samples, and the time required to reach the peak hardness gradually decreases. In addition, bimodal hardening was observed during pre-deformation of the alloy. The results of TEM study show that the density of S ’(Al 2 CuMg) phase in the alloy decreases and the size decreases with the increase of the pre-deformation of the cold-rolled alloy. The high density, fine S’ phase and high density Dislocations are the main cause of increased peak hardness and strength of the alloy.