ARB工艺对1060工业纯铝组织和性能的影响

Effect of Accumulative Roll Bonding(ARB) Process on Microstructure and Mechanical Properties of 1060 Commercial Pure Aluminium

采用ARB技术中两种轧制工艺,研究变形后1060工业纯铝的显微组织和力学性能变化。结果显示,在两种ARB轧制工艺中,单向轧制工艺的晶粒细化效果明显好于换向轧制。ARB7道次后,采用单向轧制工艺试样的显微组织由拉长的细小纤维状晶粒组成,平均晶粒尺寸是470nm;采用换向轧制工艺试样由等轴状晶粒组成,平均晶粒尺寸是680nm。同时,单向轧制后,材料的抗拉强度和显微硬度提高程度大于换向轧制,但延伸率却不如换向轧制。分析了ARB过程材料的变形规律和细小晶粒的形成机制。

The effect of deformation on microstructure and mechanical properties of 1060 commercial pure Al were investigated using two kinds of rolling techniques of ARB. The results showed that the effectiveness of unidirectional rolling was better than that of multi-direction rolling in changed fining grain size. After ARB7 passed, the microstructure of unidirectional rolling was consisted of elongated fiber shape thin grains with the average size of 470 nm and that of multi-direction rolling was consisted of equiaxed grains with the average size of 680 nm. So that the tensile strength, the strengthening effect of unidirectional rolling were better than that of multi-direction rolling. But the elongation of specimens by unidirectional rolling was less than that of specimens by multi-direction rolling. The deformation regularity and formation mechanism of UFG were analyzed during ARB process.