Journal article
Intrinsically ductile failure in a nanocrystalline beta titanium alloy
W Xu, RB Figueiredo, X Wu, S Pauly, M Stoica, J Eckert, TG Langdon, K Xia
Advanced Engineering Materials | WILEY-V C H VERLAG GMBH | Published : 2011
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. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Grants
Awarded by National Science Foundation of the United States
Funding Acknowledgements
Support is gratefully acknowledged from the Australian Research Council, the AvH Foundation, the German Science Foundation, and the National Science Foundation of the United States (Grant No. DMR-0855009).