研究了粗晶Mg-3Gd-1Zn合金在723 ～823 K,应变速率0.100 ～0.001s-1条件下单轴压缩变形过程中的动态再结晶行为.研究结果表明,其热压缩曲线为典型的动态再结晶型,峰值流变应力和稳态流变应力随温度的升高而减小,随应变速率的增大而增大；在该实验温度范围内其变形激活能约为140 kJ·mol-1；再结晶晶粒尺寸lnd与lnZ参数偏离线性关系,且变形温度对再结晶晶粒尺寸的影响比应变速率更大.利用金相和电子背散射技术(EBSD)对773 K,0.010 s-1条件下压缩不同变形量的Mg-3Gd-1Zn合金进行了组织表征,发现其动态再结晶大都发生在孪晶界及其与原始晶界的交叉处,主要为孪生诱发动态再结晶形核(TDRX)机制.再结晶形核初期形状不规则,晶界倾向于呈直角,随着应变量的增大,由于晶界的局部迁移,再结晶晶粒逐渐转变为稳定的等轴晶.
参考文献
| [1] | 王栓强.镁合金压铸技术进展[J].铸造技术,2008(09):1292-1294. |
| [2] | Xiong C X;Zhang X M;Deng Y L .Effects of cryogenic treatment on mechanical properties of extruded Mg-Gd-Y-Zr(Mn) alloys[J].Journal of Central South University of Technology,2007,3:305. |
| [3] | 丁茹,王伯健,任晨辉,刘长瑞.异步轧制AZ31镁合金板材的晶粒细化及性能[J].稀有金属,2010(01):34-37. |
| [4] | Yan H;Chen R S;Han E H .Room-temperature ductility and anisotropy of two rolled Mg-Zn-Gd alloys[J].Materials Science and Engineering A,2010,527:3317. |
| [5] | Wu D;Chen R S;Han EH .Excellent room-temperature ductility and formability of rolled Mg-Gd-Zn alloy sheets[J].Journal of Alloys and Compounds,2011,509:2856. |
| [6] | Galiyeva A;Kaibyshev R;Gottstein G .Correlation of plastic deformation and dynamic recrystallization in magnesim alloy ZK60[J].Acta Materials,2001,49:1199. |
| [7] | Tan C;Tan M J .Dynamic continuous recrystallization characteristics in two stage deformation of Mg-3Al-1Zn alloy sheet[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2003,339:124. |
| [8] | Sitdikov O;Kaibyshev R;Sakai T .Dynamic recrystallization based on twinning in coarse-grained Mg[J].Materials Science Forum,2003,419-422:521. |
| [9] | Yan H;Xu S W;Chen R S;Kamado S,Honma T,Han Enhou .Twins,shear bands and recrystallization of a Mg-2.0％ Zn-0.8％ Gd alloy during rolling[J].Scripta Materialia,2011,64:141. |
| [10] | Zhang Y;ZengX Q;Lu C;Ding W J .Deformation behavior and dynamic recrystallization of a Mg-Zn-Y-Zr alloy[J].Materials Science and Engineering A,2006,428:91. |
| [11] | Doherty R D;Hughes D A;Humpherys F J .Current issues in recrystallization:a review[J].Materials Science and Engineering A,1997,238:219. |
| [12] | Poirier J P.晶体高温塑性变形[M].大连:大连理工大学出版社,1989:362. |
| [13] | Joans J J;Sellars C M;Tegart W J M .Strength and structure under hot-working conditions[J].Metallurgical reviews,1969,14:1. |
| [14] | Watanabe H;Tsutsui H;Mukai I;Ishikawa K Okanda Y Kohzu M Higashik K .Grain size control of commercial wrought MgAl-Zn alloys utilizing dynamic recrystallization[J].Materials Transactions,2001,42:1200. |
| [15] | Robson J D;Henry D T;Davis B .Particle effects on recrystallization in magnesium alloys:Particle-stimulated nucleation[J].Acta Materialia,2009,57:2739. |
| [16] | Xu Shiwei;Matsumoto N;Kamado S;Honma T,Kojima Y .Dynamic microstructural changes in Mg-9Al-1Zn alloy during hot compression[J].Scripta Materialia,2009,61:249. |
| [17] | Myshlyaev MM.;McQueen HJ.;Mwembela A.;Konopleva E. .Twinning, dynamic recovery and recrystallization in hot worked Mg-Al-Zn alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):121-133. |
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