Intrinsically Ductile Failure in a Nanocrystalline Beta Titanium Alloy |
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| Authors: | Wei Xu Roberto B. Figueiredo Xiaolin Wu Simon Pauly Mihai Stoica Jürgen Eckert Terence G. Langdon Kenong Xia |
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| Affiliation: | 1. Department of Mechanical Engineering and ARC Centre of Excellence for Design in Light Metals, University of Melbourne, Victoria 3010, (Australia);2. Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, Belo Horizonte, MG 31270‐901, (Brazil);3. Institut für Komplexe Materialien, IFW Dresden, Helmholtzstraβe 20, D‐01069 Dresden, (Germany);4. Institut für Werkstoffwissenschaft, TU Dresden, D‐01062 Dresden, (Germany);5. Materials Research Group, School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, (UK);6. Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089‐1453, (USA) |
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| Abstract: | 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. |
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