对AZ31镁合金进行了不同轧角的冷轧及退火处理以细化其晶粒尺寸,然后在不同变形条件下对AZ31镁合金进行拉伸试验,研究了应变速率、变形温度、晶粒尺寸等因素对镁合金塑性的影响,并探讨了其超塑性的变形机理.结果表明:随着变形温度的升高,合金的流变应力单调递减,伸长率增大;在150～300℃,合金的变形激活能为90 kJ·mol-1,变形机制是晶界扩散控制的位错蠕变机制;在300～350℃,变形激活能为123 kJ·mol-1,变形机制是晶格扩散控制的晶界滑移;此合金的塑性成形条件适合工业生产.
AZ31 alloy was cold rolled under different rolling angles and subsequently annealed to refine the grain size. The effects of deformation conditions on the plasticity were investigated through tensile tests under different temperatures, strain rates and grain sizes. Meanwhile, superplastic deformation mechanism was investigated. The results show that the flow stresses were decreased and the elongations were increased with the temperature increase. In the temperature range of 150- 300 ℃, the deformation activation energy was 90 kJ ·mol-1, the deformation mechanism was dislocation creep controlled by grain boundary diffusion. In the temperature range of 300-350 ℃, the deformation activation energy was 123 kJ · mol-1 , the deformation mechanism was grain boundary slip controlled by lattice diffusion. The plastic deformation conditions of the alloy were suitable for industrialized production.
参考文献
| [1] | 宗钦 .AZ31镁合金高温蠕变及超塑性研究[D].武汉科技大学,2007. |
| [2] | 丁睿,蔡庆伍,魏松波.变形参数对AZ31镁合金变形抗力的影响[J].北京科技大学学报,2008(03):258-262. |
| [3] | 陈振华,刘俊伟,陈鼎,严红革.镁合金超塑性的变形机理﹑研究现状及发展趋势[J].中国有色金属学报,2008(02):193-202. |
| [4] | 汪凌云,黄光杰,陈林,黄光胜,李伟,潘复生.镁合金板材轧制工艺及组织性能分析[J].稀有金属材料与工程,2007(05):910-914. |
| [5] | 常量,曾小勤,丁文江.不同轧制方法制得镁合金板材的组织和织构特点[J].轻合金加工技术,2007(04):4-9,53. |
| [6] | 李保成,王强,张治民.AZ80合金初始晶粒对其流变应力影响的研究[J].塑性工程学报,2008(01):88-91. |
| [7] | 吴立鸿,马全仓,张春香,关绍康,刘旭东.AZ70镁合金的高温流动应力及本构模型[J].稀有金属材料与工程,2008(01):54-57. |
| [8] | Y. J. Chen;Q. D. Wang;H. J. Roven .Microstructure evolution in magnesium alloy AZ31 during cyclic extrusion compression[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):192-200. |
| [9] | del Valle JA;Penalba F;Ruano OA .Optimization of the microstructure for improving superplastic forming in magnesium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):165-171. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%