High temperature rise dominated cracking mechanisms in ultra-ductile and tough titanium alloy

L. Choisez, L. Ding, M. Marteleur, H. Idrissi, T. Pardoen and P. J. Jacques ()
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L. Choisez: UCLouvain
L. Ding: UCLouvain
M. Marteleur: UCLouvain
H. Idrissi: UCLouvain
T. Pardoen: UCLouvain
P. J. Jacques: UCLouvain

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Extensive use of titanium alloys is partly hindered by a lack of ductility, strain hardening, and fracture toughness. Recently, several β-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 °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.

Date: 2020
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DOI: 10.1038/s41467-020-15772-1

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