Fatigue crack growth behaviour in single-colony lamellar structure of Ti–6Al–4V. (May 2019)

• Record Type: Journal Article
• Authors: Mine, Yoji; Katashima, Shunsuke; Ding, Rengen; Bowen, Paul; Takashima, Kazuki
• Is Part Of: Scripta materialia. Number 165(2019)
• Page Start: 107
• Page End: 111
• Publication Date: 2019-05
• Subjects: Micro-mechanical test -- Titanium alloys -- Deformation structure -- Fatigue -- Slip; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.02.029
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: Unlabelled Image