采用GLEEBLE-1500热模拟机对Mg-10.2Gd-0.8Sc-1.7Mn合金在温度为573～773 K、应变速率为0.001～1 s-1、最大变形程度为60%的条件下,进行高温压缩模拟实验研究. 分析了合金流变应力和应变速率及变形温度之间的关系,计算了高温变形时的变形激活能和应力指数,为选择这种合金的热变形加工条件提供实验依据. 采用金相显微镜分析了合金在不同温度下压缩变形的组织演变. 结果表明:合金的稳态流变应力随应变速率的增大而增大,在恒定应变速率的条件下,合金的真应力随温度的升高而降低; 合金的变形激活能随着变形温度的升高而增大,特别是在723 K时迅速增大. 合金在变形过程中发生了不同程度的动态再结晶,变形温度和变形速率对合金再结晶组织有明显的影响. 根据实验分析,合金的热加工宜在673～723 K范围内进行.
参考文献
| [1] | Decker R F.The renaissance in magnesium[J].Current Advances in Materials and Processes,1998(09):31. |
| [2] | Luo Alan A .Recent magnesium alloy development for automotive powertrain application[J].Materials Science Forum,2003,419-422(01):57. |
| [3] | Drits M E;Sviderkaya Z A;Rokhlin L L .Effect of alloying on properties of Mg-Gd alloys[J].Metallovedenie I Termicheskaya Obrabotka Metallov,1979,11:62. |
| [4] | Shigeru I;Yuuji N;Shigeharu K .Age hardening characteristics and high temperature tensile properties of Mg-Gd and Mg-Dy alloys[J].Japanese Journal of Institute of Light Metals,1994,44(01):3. |
| [5] | Rokhlin LL.;Nikitina NI. .Recovery after ageing of Mg-Y and Mg-Gd alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(2):166-170. |
| [6] | 张洪杰,孟健,唐定骧.高性能镁-稀土结构材料的研制、开发与应用[J].中国稀土学报,2004(01):40-47. |
| [7] | Li Yaguo;Liu Shirong .Effect of yttrium on microstructure of magnesium alloy Mg-Zn-Zr[J].Journal of Rare Earths,2004,22(01):112. |
| [8] | Mordike B L.Development of highly creep resistant magnesium alloys[J].Journal of Materials Processing Technology,2001(117):391. |
| [9] | Mordike BL. .Creep-resistant magnesium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1-2 Special Issue SI):103-112. |
| [10] | Smola B.;Stulikova I.;von Buch F.;Mordike BL. .Structural aspects of high performance Mg alloys design[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1-2 Special Issue SI):113-117. |
| [11] | 张新明,彭卓凯,陈健美,邓运来.耐热镁合金及其研究进展[J].中国有色金属学报,2004(09):1443-1450. |
| [12] | Buch F V;Lietzau J;Mordike B L;Pisch A Schmid-Fetzer R .Development of Mg-Mn-Sc Alloys[J].Materials Science and Engineering,1999,A263:1. |
| [13] | Grobner J;Schmid-Fetzer R .Selection of promising quaternary candidates from Mg-Mn-(Sc,Gd,Y,and Zr) for development of creep-resistant magnesium alloys[J].Journal of Alloys and Compounds,2001,320:296. |
| [14] | Poirier J P;关德林.晶体的高温塑性变形[M].大连:大连理工大学出版社,1989:25. |
| [15] | Takuda H .Modelling on flow stress of Mg-Al-Zn alloys at elevated temperatures[J].Journal of Materials Processing Technology,1998,80-81:513. |
| [16] | Polmear I J .Magnesium alloys and applications[J].Materials Science and Technology,1994,10:1. |
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