采用Gleeble-1500热模拟试验机对ZK60镁合金在变形温度为150～400℃,应变速率为0.001～10 s-1条件下的热变形行为进行研究,利用双曲正弦关系式描述了该合金在热变形过程中的稳态流变应力;根据合金动态模型,计算并分析了该合金的加工图.研究表明：利用加工图可确定出该合金热变形的流变失稳区,导致变形失稳的原因主要是孪生和局部流变;试验条件下热变形的最佳工艺参数为变形温度350℃,应变速率0.001 s-1,在该条件下合金发生完全再结晶,具有较好的塑性.
The flow behavior of ZK60 magnesium alloy was investigated by compression tests on a Gleeble-1500 simulator from 150 ℃ to 400 ℃ and from 0.001 s-1to 10 s-1.The steady flow stress during hot compression was modeled by a hyperbolic sine constitutive equation.The processing maps were drawn and analyzed according to the dynamic material model.The results show that the flow instability zones of flow behavior can be recognized by the maps,twining and local flow are the main reasons for the flow instability.According to the maps,the optimal processing temperature and strain rate of hot deformation under the test condition were 300 ℃ and 0.001 s-1,where the alloy was fully recrystallized and exhibited superior ductility.
参考文献
| [1] | Alan A. Luo .Magnesium: Current and Potential Automotive Applications[J].JOM,2002(2):42-48. |
| [2] | Albrecht Stalmann;Wolfgang Sebastian;Horst Friedrich;Sonke Schumann;Klaus Droder .Properties and processing of magnesium wrought products for automotive applications[J].Advanced Engineering Materials,2001(12):969-974. |
| [3] | Robert VanFleteren .MAGNESIUM for automotive applications[J].Advanced Materials & Processes,1996(5):33-34. |
| [4] | Y. V. R. K. Prasad;T. Seshacharyulu .Modelling of hot deformation for microstructural control[J].International Materials Reviews,1998(6):243-258. |
| [5] | S.V.S. Narayana Murty;B. Nageswara Rao;B.P. Kashyap .Identification of flow instabilities in the processing maps of AISI 304 stainless steel[J].Journal of Materials Processing Technology,2005(2):268-278. |
| [6] | Prasad YVRK.;Seshacharyulu T. .Processing maps for hot working of titanium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):82-88. |
| [7] | Kyung Won Lee;Jae Sam Ban;Min Geun Lee;Gyu Ha Kim;Kyu Zong Cho .Processing map for the hot working of Ti-8Ta-3Nb[J].Journal of Mechanical Science and Technology,2008(5):931-936. |
| [8] | McQueen HJ.;Ryan ND. .Constitutive analysis in hot working[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1-2 Special Issue SI):43-63. |
| [9] | Zhiyi Liu;Song Bai;SukBong Kang .Low-temperature dynamic recrystallization occurring at a high deformation temperature during hot compression of twin-roll-cast Mg-5.51Zn-0.49Zr alloy[J].Scripta materialia,2009(6):403-406. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%