Fatigue crack growth behaviour in single-colony lamellar structure of Ti–6Al–4V

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Kumamoto University
  • Kumamoto University

Abstract

Microstructural fatigue crack growth in Ti–6Al–4V lamellar colonies was examined using small compact-tension specimens, with post-fatigue-test transmission electron microscopy for a mechanistic understanding of the anisotropy. In colonies oriented favourably for prismatic slip in the α phase, the crack grew by alternating shearing on two symmetrically arranged prismatic slip planes (unzipping process). Interlamellar decohesion along the α/β interface significantly increased the crack growth rate, which depended on the lamellar orientation. When the colony was loaded along [0001], deflected crack growth was accompanied by basal slip and < c + a > pyramidal slip gliding, and the crack growth rates slightly exceeded those during unzipping.

Details

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalScripta Materialia
Volume165
Early online date23 Feb 2019
Publication statusPublished - 1 May 2019

Keywords

  • Deformation structure, Fatigue, Micro-mechanical test, Slip, Titanium alloys