Intrinsically ductile failure in a nanocrystalline beta titanium alloy

Wei Xu*, Roberto B. Figueiredo, Xiaolin Wu, Simon Pauly, Mihai Stoica, Jürgen Eckert, Terence G. Langdon, Kenong Xia

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A nanocrystalline bcc Ti 67.4Nb 24.6Zr 5Sn 3 alloy is shown to fracture in an intrinsically ductile manner with exceptionally large dimples (up to 10 μm) which are two orders of magnitude greater than the grain size (≈40nm). This large plasticity length scale is attributed to a combination of low shear modulus (≈ 27GPa), high Poisson's ratio (≈ 0.4) and ultrahigh strength (UTS ≈ 1.1GPa), close to the ideal shear stress, which facilitates ideal shear deformation to promote transgranular shear.

Original languageEnglish
Pages (from-to)1108-1113
Number of pages6
JournalAdvanced Engineering Materials
Volume13
Issue number12
DOIs
Publication statusPublished - Dec 2011
Externally publishedYes

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