利用Gleeble 1500热/力模拟机对Ti14合金进行了半固态压缩变形试验,研究了该合金在应变速率为5×10-2 s-1和5×10-1 s-1,变形温度为1273~1423 K条件下的流变应力变化规律,分析了该合金半固态下应力松弛发生的条件和原因,并讨论了温度、应变速率和变形机制之间的耦合关系.结果表明:温度和应变速率对流变应力有显著的影响,流变应力随着变形温度的升高和应变速率的降低而降低,宏观应力松弛发生在固相含量区间为0.95~0.98,主要是因为液相的增加减少了晶粒间的“固相桥”作用.由于液相在变形中的渗漏,Ti14合金在1273~1423 K半固态变形的应变速率试验值远远小于Iwasaki润滑流动机制(固液混合变形机制)所需的理论值,说明在所测试的半固态区间内合金仍以固相粒子变形为主,固液混合变形为协调机制.
参考文献
[1] | Flemings M C .[J].Metallurgical and Materials Transactions,1991,22B:269. |
[2] | Eskin D G;Suytino;Katgerman L .[J].Progress in Materials Science,2004,49:629. |
[3] | Phillion A B;Thompson S;Cockcroft S L et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2008,497:388. |
[4] | Puttgen W;Hallstedt B;Bleck W et al.[J].Acta Materialia,2007,55:6553. |
[5] | Zhao Y Q;Wu W L;Ma X D .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2004,373:315. |
[6] | Chen Y N;Wei J F;Zhao Y Q .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2009,520:16. |
[7] | Chen Y N;Wei J F;Zhao Y Q.[J].Materials Science Forum,2009:287. |
[8] | 赵永庆;朱康英 .[P].China Patent(中国专利).ZL02101190.7,2002. |
[9] | Martin J L;Wilshire B;Evans R W.Creep Behaviour of Crystalline Solids[M].UK:Pineridge Press,1985 |
[10] | Phillion A B;Cockcroft S L;Lee P D .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2008,491:237. |
[11] | Colley L J;Wells M A;Maijer D M .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2004,386:140. |
[12] | Phillion A B;Coekcroft S L;Lee P D .[J].Scripta Materialia,2009,55:489. |
[13] | Suytino;Eskin D G;Katgerman L .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2006,420:1. |
[14] | Grand Filed;Wang L .[J].Light Mater,2004,420:1. |
[15] | Chen C P;Tsao A .[J].Acta Materialia,1996,45:1955. |
[16] | Chino Y;Kobata M;Iwasaki H .[J].Acta Materialia,2003,51:3309. |
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