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Erschienen in: Journal of Materials Engineering and Performance 1/2015

01.01.2015

Shear Localization and its Related Microstructure Mechanism in a Fine-Grain-Sized Near-Beta Ti Alloy

verfasst von: Bingfeng Wang, Jieying Sun, Eric Nicholas Hahn, Xiaoyan Wang

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 1/2015

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Abstract

Shear localization is an important deformation and failure mechanism for the high strength near beta fine-grain-sized titanium alloy used in aircraft’s gear at high rate deformation. Hat-shaped specimens are used to induce the formation of an adiabatic shear band under controlled shock-loading tests. Unstable shear deformation of the alloy emerges after the true flow stress reaches 1147 MPa, the first vibration peak during the split Hopkinson pressure bar testing, and the whole process lasts about 68 μs. The microstructures within the shear band in the alloy are investigated by means of light microscopy, scanning electron microscopy, and transmission electron microscopy. The results show that the grains in the boundary of the shear band are highly elongated along the shear direction, and the core of the shear band consists of ultrafine-equiaxed grains with diameters 0.1-0.3 μm, low dislocation density, and no observed phase transformation. The rotational dynamic recrystallization is used to explain the microstructural evolution mechanism in the shear band. Kinetic calculations indicate that the recrystallized ultrafine grains are formed during the deformation and do not undergo significant growth by grain boundary migration after deformation.

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Metadaten
Titel
Shear Localization and its Related Microstructure Mechanism in a Fine-Grain-Sized Near-Beta Ti Alloy
verfasst von
Bingfeng Wang
Jieying Sun
Eric Nicholas Hahn
Xiaoyan Wang
Publikationsdatum
01.01.2015
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 1/2015
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-014-1285-0

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