锻压技术

车用6061铝合金三级轧制加工的力学性能及组织演变分析

英文标题：Analysis on mechanical properties and microstructure evolution of 6061 aluminum alloy for vehicles in three-stage rolling process

作者：韦玉堂蔡建军

单位：河北科技大学

关键词：铝合金轧制加工力学性能组织演变时效处理

分类号：TG146.2

出版年,卷(期):页码：2019,44(6):173-177

摘要：

采用三级轧制加工方法对车用6061铝合金进行加工，通过组织和力学性能测试方法对其进行实验测试分析。研究结果表明：T6态铝合金样品经过固溶热轧处理后出现了再结晶的现象；经过室温变形处理后，样品转变为纤维状的组织结构。6 h时效处理的6061铝合金样品达到了最大的位错密度，当时效时间增加后，铝合金位错密度开始减小。时效处理6 h的合金基体上析出大量的析出相η′，随着时效时间的增加，从铝合金TEM图像中可清晰地发现，生成了一些粗大的η′相，且η′相的密度发生一定的降低。6 h时效的样品达到了最高的力学性能，当时效时间增加后，伸长率发生了先增大后减小的现象。T6态铝合金样品中形成的腐蚀深度达到了80.2 μm，当时效时间增加后，铝合金样品获得了更优的抗腐蚀性能。

The 6061 aluminum alloy was machined by three-stage rolling processing method, and tested and analyzed by the test methods of structure and mechanical properties. The results show that the recrystallization of T6 aluminum alloy occurs after the solid solution and hot rolled treatment, and the samples are transformed into fibrous structures after room-temperature deformation treatment. Then, the dislocation density of 6061 aluminum alloy samples with aging 6 h reaches the maximum, and the dislocation density of aluminum alloy begins to decrease when the aging time increases. Furthermore, a large number of precipitated phase η′ precipitates out from the alloy matrix after aging treatment for 6 h. With the increasing of aging time, aluminum alloy generates some thick precipitated phase η′, and the density of phase η′ decreases from the TEM image. The mechanical properties of 6 h aging sample reaches the highest level. When the aging time increases, the elongation first increases and then decreases. The corrosion depth of T6 aluminum alloy sample reaches 80.2 μm. When the aging time increases, the aluminum alloy sample has better corrosion resistance.

基金项目：

河北省自然科学基金资助项目（E2016202008）

韦玉堂（1964-），男，硕士，副教授 E-mail：wujuanbo831109@126.com

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