在Gleeble-1500D热模拟机上进行了单向热压缩试验,研究了GWN751K镁合金在变形温度为623-773K,应变速率为0.002-2s-1条件下热变形行为,变形量为60%.结果表明,在相同变形温度条件下,流变应力随变形速率的增加而上升,在相同的应变速率条件下,流变应力随着变形温度的升高而下降,计算出其平均激活能Q为228.61kJ/mol,应力指数n为4.2.根据材料动态模型,计算并分析了GWN751K合金的热加工图,并确定了合适的挤压加工条件为723K,0.01/s.通过对合金的挤压试验研究,验证了加工条件,挤压后的合金断裂强度为320MPa,延伸率为18%,较铸态合金有显著提高.
参考文献
| [1] | MA Ming-long,ZHANG Kui,LI Xing-gang,LI Yong-jun,ZHANG Kang.Hot deformation behavior of rare earth magnesium alloy without pre-homogenization treatment[J].中国有色金属学会会刊(英文版),2008(z1):132-139. |
| [2] | Kun Yu;Wenxian Li;Jun Zhao .Plastic deformation behaviors of a Mg-Ce-Zn-Zr alloy[J].Scripta materialia,2003(9):1319-1323. |
| [3] | Ya Zhang;Xiaoqing Zeng;Chen Lu;Wenjiang Ding .Deformation behavior and dynamic recrystallization of a Mg-Zn-Y-Zr alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):91-97. |
| [4] | 鲁世强,李鑫,王克鲁,董显娟,李臻熙,曹春晓.基于动态材料模型的材料热加工工艺优化方法[J].中国有色金属学报,2007(06):890-896. |
| [5] | Wang CY;Wang XJ;Chang H;Wu K;Zheng MY .Processing maps for hot working of ZK60 magnesium alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1-2):52-58. |
| [6] | Y. V. R. K. Prasad;T. Seshacharyulu .Modelling of hot deformation for microstructural control[J].International Materials Reviews,1998(6):243-258. |
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