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采用温轧及退火的组合工艺对5083铝合金进行加工,在250℃下以1×10-3s-1初始应变速率对试样进行拉伸试验,并利用塑性异向性值R对试样拉伸过程中的颈缩现象进行分析,对拉伸过程中试样最大局部真应变处的TEM图像和电子衍射花样进行观察。结果表明:最大局部真应变值为1.31处的R值趋近于0.8,预测其颈缩不会恶化而得到不错的伸长率;随着拉伸的进行,晶粒尺寸增大而晶粒间的位错密度却减小,晶粒也从拉伸前的[110]及[112]织构组织转换成较散乱分布的晶粒取向。
The 5083 aluminum alloy was processed by the combination of warm rolling and annealing. The tensile test was carried out at 250 ℃ under the initial strain rate of 1 × 10-3s-1, and the tensile strength The phenomenon of necking in the stretching process was analyzed. TEM images and electron diffraction patterns at the maximum true strain of the sample during the stretching process were observed. The results show that the R value at the maximum local true strain of 1.31 approaches 0.8 and the necking is predicted to not deteriorate to obtain a good elongation. As the stretching proceeds, the grain size increases while the intergranular The dislocation density is reduced and the grains are also converted from the [110] and [112] texture before stretching to the more disordered grain orientation.