锻压技术

变形量对多道次拉拔和减径轧制5056铝棒组织和力学性能的影响

英文标题：Influences of deformation amount on microstructure and mechanical properties of 5056 aluminum bar in multi-pass drawing and reduced diameter rolling

作者：张晓晖谭驰高

单位：包头轻工职业技术学院中国汽车工业工程有限公司

关键词：5056铝棒多道次拉拔减径轧制变形量力学性能

分类号：TQ133

出版年,卷(期):页码：2019,44(7):170-173

摘要：

对5056铝棒进行了多道次拉拔和减径轧制变形处理，分析了其显微组织结构和力学强度的变化情况。研究结果表明：随着拉拔应变增大至2.0，晶粒被拉长，晶粒发生了显著的细化。当铝棒受到大压下量轧制后，基体中形成了许多平行于轧制态结构的位错胞，生成了部分和轧制方向保持一定角度的片层晶粒位错亚结构。纯铝材料的强度随拉拔与轧制程度的上升而增大，同时伸长率发生了降低的现象；增大等效应变量后，晶粒的尺寸将会发生不断细化，由此实现强度增大的效果；受拉拔与轧制时引起的晶粒择优取向影响，强度也会随之上升。

The deformation treatments of multi-pass drawing and reduced diameter rolling for 5056 aluminum bar were conducted, and the changes of microstructure and mechanical strength of 5056 aluminum bar were analyzed. The results show that the grains are elongated, and the grains are significantly refined as the drawing strain increasing to 2.0. When the 5056 aluminum bar is rolled under high deformation amount, a number of dislocation cells parallel to the rolled structure are formed in the matrix, and a layered grain dislocation substructure with a certain angle to the rolling direction is generated partly. However, the strength of pure aluminum increases with the increasing of drawing and rolling degrees, and the elongation decreases. After increasing the equivalent strain, the grain size is further refined to achieve the effect of strength increase. Thus, the strength is increased due to the influence of preferred orientation of grain during drawing and rolling.

基金项目：

内蒙古自治区教科研规划课题（NZJGH2018072）

张晓晖（1973- ），女，硕士，副教授，E-mail：lidecao903208@126.com

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