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Intrinsically ductile failure in a nanocrystalline beta titanium alloy

journal contribution
posted on 2011-12-01, 00:00 authored by Wei XuWei Xu, Roberto B Figueiredo, Xiaolin Wu, Simon Pauly, Mihai Stoica, Juergen Eckert, Terence G Langdon, Kenong Xia
A nanocrystalline bcc Ti67.4Nb24.6Zr5Sn3 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 (≈ 40 nm). This large plasticity length scale is attributed to a combination of low shear modulus (≈ 27 GPa), high Poisson's ratio (≈ 0.4) and ultrahigh strength (UTS ≈ 1.1 GPa), close to the ideal shear stress, which facilitates ideal shear deformation to promote transgranular shear.

History

Journal

Advanced engineering materials

Volume

13

Pagination

1108-1113

Location

Chichester, Eng.

ISSN

1438-1656

eISSN

1527-2648

Language

English

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

Issue

12

Publisher

John Wiley & Sons