采用上下轧辊速比1.125的异径异步轧制方法对AZ31镁合金板材进行轧制.采用光学显微镜、X射线衍射仪和电子拉伸机等设备分析轧制前后AZ31镁合金板材的微观组织和力学性能.结果表明:AZ31镁合金热挤压板坯在加热到350℃后,经一道次38%压下率的异步轧制,可获得平均晶粒尺寸为2.8 μm的等轴晶粒,板材轧制方向的伸长率和抗拉强度显著增加;轧制过程中形成了非基面晶粒取向;伸长率的增大与晶粒细化和非基面织构的形成有关,抗拉强度的增大归因于晶粒的显著细化效应.
AZ31 magnesium alloy sheets were rolled by applying a circumferential velocity ratio of 1.125 between the upper and lower rolls in different diameter rolling.Microstrueture and mechanical properties of the sheets before and after rolling were observed and analyzed by optical microscopy,X-ray diffraction,and electronic draw-frame.The results indicated that a fine equiaxed grain size of 2.8μm could be achieved in AZ31 magnesium alloy hot-extrusion sheets when heated to 350℃ after a single pass of 38%thickness reduction.The elongation and tensile strength along the rolling direction were significantly enhanced.Non-basal plane grain orientation was formed during the rolling.The increase of elongation was related to the grain refinement and the formation of non-basal plane grain orientation,and the increase of tensile strength was attributed to the significant grain refinement effect.
参考文献
| [1] | Ji Y H;Park J J;Kim W J .Finite element analysis of severe deformation in Mg-3 Al-1 Zn sheets through differential-speed rolling with a high speed ratio[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,454-455:570. |
| [2] | Watanabe H;Mukai T;Ishikawa K .Differential speed wiling of an AZ31 magnesium alloy and the resulting mechanical properties[J].Journal of Materials Science,2004,39:1477. |
| [3] | 张文玉,刘先兰,陈振华.异步轧制AZ31镁合金板材室温冲压性能研究[J].塑性工程学报,2007(04):6-10. |
| [4] | 张文玉,刘先兰,陈振华,夏伟军.非对称/对称轧制AZ31镁合金微观组织研究[J].材料工程,2008(06):25-28. |
| [5] | Kim WJ;Lee JB;Kim WY;Jeong HT;Jeong HG .Microstructure and mechanical properties of Mg-Al-Zn alloy sheets severely deformed by asymmetrical rolling[J].Scripta materialia,2007(4):309-312. |
| [6] | Iwanaga K;Tashiro H;Okamoto H;Shimizu K .Improvement of formability from room temperature to warm temperature in AZ31 magnesium alloy[J].Journal of Materials Processing Technology,2004,155-156:1313. |
| [7] | 刘英,陈维平,张卫文,朱权利,赵海东.等通道转角挤压后AZ31镁合金的微观结构与性能[J].华南理工大学学报(自然科学版),2004(09):50-53. |
| [8] | 李尧.异步轧制对3004铝合金变形织构及制耳率的影响[J].中国有色金属学报,1997(02):113-117. |
| [9] | 汪凌云,范永革,黄光杰,黄光胜,潘复生,刘正宏.AZ31B镁合金板材的织构[J].材料研究学报,2004(05):466-470. |
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