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Title
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High temperature rise dominated cracking mechanisms in ultra-ductile and tough titanium alloy
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Author
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Abstract
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| Extensive use of titanium alloys is partly hindered by a lack of ductility, strain hardening, and fracture toughness. Recently, several beta -metastable titanium alloys were designed to simultaneously activate both transformation-induced plasticity and twinning-induced plasticity effects, resulting in significant improvements to their strain hardening capacity and resistance to plastic localization. Here, we report an ultra-large fracture resistance in a Ti-12Mo alloy (wt.%), that results from a high resistance to damage nucleation, with an unexpected fracture phenomenology under quasi-static loading. Necking develops at a large uniform true strain of 0.3 while fracture initiates at a true fracture strain of 1.0 by intense through-thickness shear within a thin localized shear band. Transmission electron microscopy reveals that dynamic recrystallization occurs in this band, while local partial melting is observed on the fracture surface. Shear band temperatures of 1250-2450 degrees C are estimated by the fusible coating method. The reported high ductility combined to the unconventional fracture process opens alternative avenues toward Ti alloys toughening. Specific titanium alloys combine transformation-induced plasticity and twinning-induced plasticity for improved work hardening. Here, the authors show that these alloys also have an ultra-large fracture resistance and an unexpected fracture mechanism via dynamic recrystallization and local melting in a deformation band. |
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Language
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English
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Source (journal)
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Nature communications
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Publication
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2020
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ISSN
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2041-1723
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DOI
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10.1038/S41467-020-15772-1
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Volume/pages
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11
:1
(2020)
, 8 p.
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Article Reference
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2110
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ISI
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000558816700010
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Pubmed ID
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32355157
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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