J. Mater. Sci. Technol. ›› 2006, Vol. 22 ›› Issue (06): 737-746.

• 论文 • 上一篇    下一篇

Deformation, Phase Transformation and Recrystallization in the Shear Bands Induced by High-Strain Rate Loading in Titanium and Its Alloys

徐永波   

  1. 金属所
  • 收稿日期:2006-02-16 修回日期:2006-04-24 出版日期:2006-11-28 发布日期:2009-10-10
  • 通讯作者: Yongbo XU

Deformation, Phase Transformation and Recrystallization in the Shear Bands Induced by High-Strain Rate Loading in Titanium and Its Alloys

Yongbo XU, Yilong BAI, M.A.Meyers   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China...
  • Received:2006-02-16 Revised:2006-04-24 Online:2006-11-28 Published:2009-10-10
  • Contact: Yongbo XU

关键词: Localized, shear, bands, Dislocations, Twinn

Abstract: α-titanium and its alloys with a dual-phase structure (α+β) were deformed dynamically under strain rate of about 104 s-1. The formation and microstructural evolution of the localized shear bands were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results reveal that both the strain and strain rate should be considered simultaneously as the mechanical conditions for shear band formation, and twinning is an important mode of deformation. Both experimental and calculation show that the materials within the bands underwent a superhigh strain rate (9×105 s-1) deformation, which is two magnitudes of that of average strain rate required for shear band formation; the dislocations in the bands can be constricted and developed into cell structures; the phase transformation from α to α2 within the bands was observed, and the transformation products (α2) had a certain crystallographic orientation relationship with their parent; the equiaxed grains with an average size of 10 μm in diameter observed within the bands are proposed to be the results of recrystallization.

Key words: Localized shear bands, Microstructure, Dislocations, Twinning, Phase transformation...