J. Mater. Sci. Technol. ›› 2014, Vol. 30 ›› Issue (12): 1284-1288.DOI: 10.1016/j.jmst.2014.07.012

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Geometrical Scale-Sensitive Fatigue Properties of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloys With α/β Lamellar Microstructures

B. Zhang1, Z.M. Song2, L.M. Lei3, L. Kang1, 2, G.P. Zhang2   

  1. 1、Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China ; 2、Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 3、AVIC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China
  • Received:2014-02-16 Revised:2014-04-04 Online:2014-12-20 Published:2015-07-23
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 51071158) and partially supported by the National Natural Science Foundation of China (Nos. 51171045 and 51371047), and the National Basic Research Program of China (No. 2010CB631003).

Abstract: Fatigue properties of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy sheets containing different numbers of α/β Widmanstätten colonies in the thickness direction of the sheets were investigated by tension-tension fatigue testing. It is found that fatigue properties of the Ti alloy either in low- or high-stress amplitude regimes become more sensitive to the sheet thickness of the Ti alloy as the sheet thickness is comparable to the length scale of the Widmanstätten colonies. The basic mechanism of such length scale-sensitive fatigue properties in the Ti alloy was elucidated.

Key words: Fatigue, Ti alloy, Microstructure, Size effect