Creep behaviors and effect factors of single crystal nickel-base superalloys.pdf

This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit: /copyright Authors personal copy Materials Science and Engineering A 499 (2009) 352–359 Contents lists available at ScienceDirect Materials Science and Engineering A journa l homepage: www.e lsev ier .com/ locate /msea Creep behaviors and effect factors of single crystal nickel-base superalloys Yu Xingfua,b, Tian Suguia,?, Wang Mingganga, Zhang Shua, Lu Xudonga, Cui Shusenb a School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China b Shenyang Liming Aero Engine (Group) Limited Liability Corporation AVIC, Shenyang 110043, China a r t i c l e i n f o Article history: Received 10 March 2008 Received in revised form 21 July 2008 Accepted 12 September 2008 Keywords: Single crystal nickel-base superalloys Internal friction stress Creep lifetimes Dislocations configuration Deformation mechanism a b s t r a c t The creep behaviors and effect factors of the single crystal nickel-base superalloys during creep are inves- tigated by means of the measurement of the internal friction stress, creep curve and microstructure observation. Results show that the internal friction stress of dislocationsmotion during steady state creep are enhanced with the increase of the refractory elements and the Ta concentration. The element Ta dis- plays a better effect for stabilizing the