研究TG6钛合金在3种显微组织条件下的600 ℃蠕变变形行为,在600 ℃,200 MPa的测试条件下,粗晶的网篮组织具有最强的蠕变抗力,而细晶的等轴组织具有最弱的蠕变抗力,双态组织介于中间.经过600 ℃长期热暴露后,TG6钛合金网篮组织的蠕变抗力有所下降,而双态组织和等轴组织的蠕变抗力反而得以提高,这归因于α2相和硅化物沉淀析出对蠕变抗力的作用,均匀析出的α2相可以提高合金的蠕变抗力,而硅化物的析出会使得α基体贫Si,减弱了Si原子气团对位错攀移的阻碍作用,从而导致蠕变抗力的下降.TG6钛合金在600 ℃,200 MPa下的稳态蠕变变形主要受位错攀移机制的控制.
参考文献
| [1] | James C. Williams;Edgar A. Starke Jr. .Progress in structural materials for aerospace systems[J].Acta materialia,2003(19):5775-5799. |
| [2] | WINSTONE M R;PARTRIDGE A;BROOKS J W .The contribution of advanced high temperature materials to future aeroengine[J].Proceedings of the Institution of Mechanical Engineers,2001,25(01):63-73. |
| [3] | NEAL D F.Development of TIMETAL834[A].Materials Design Approaches and Experiences.Indianapolis,2001:199-213. |
| [4] | Williams JC .Alternate materials choices--some challenges to the increased use of Ti alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1999(2):107-111. |
| [5] | L-TJERING G;WILLIAMS J C.Titanium[M].Heidelberg:Springer-Verlag,2003:238. |
| [6] | NEAL D F.Optimization of creep and fatigue resistance in high temperature Ti alloys IMI829 and IMI834[A].,1984:2419-2424. |
| [7] | D.V.V. Satyanarayana;Vijay Kumar Varma;G. Nagalakshmi .CREEP AND FATIGUE BEHAVIOUR OF A NEAR alpha IMI-834 TITANIUM ALLOY[J].Metals materials and processes,2007(1/4):101-110. |
| [8] | H. Mishra;P. Ghosal;T.K. Nandy;P.K. Sagar .Influence of Fe and Ni on creep of near α-Ti alloy IMI834[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):222-231. |
| [9] | ES-SOUNI M .Primary,secondary and an elastic creep of a high temperature near α-Ti alloy Ti6242Si[J].Materials Characterizations,2000,45:153-164. |
| [10] | ROSENBERG H W.Titanium alloying in theory and practice[A].Oxford,UK:Pergamon Press,1970:851-859. |
| [11] | ARDAKANI M G;SHOLLOCK B A;FLOWER H M.The effect of oxygen on microstructure of α and α2 phase in titanium-rich Ti-Al alloys[A].UK,1996:2242-2249. |
| [12] | BLACKBURN M J .The ordering transformation in titanium:Aluminum alloys containing up to 25 at.Pct aluminum[J].Transactions of the Metal Society of AIME,1967,239:1200-1208. |
| [13] | KOIKE J;EGASHIRA K;MARUYAMA K;OIKAWA H .High temperature strength of α Ti-Al alloys with a locally ordered structure[J].Materials Science and Engineering A,1996,213:98-102. |
| [14] | XU Dong-sheng;HU Qing-miao;LU Jian-min;HAO Yu-lin,YANG Rui,KULKOVA S E,BAZHANOV D I.Point defects and mechanical behavior of titanium alloys and intermetallic compounds[A].,2006:220-227. |
| [15] | PATON N E;MAHONEY M W .Creep of titanium-silicon alloys[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1976,7:1685-1694. |
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