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Journal of Materials Science

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01.09.2015 | Original Paper

Damage resistance in gum metal through cold work-induced microstructural heterogeneity

verfasst von: J.-L. Zhang, C. C. Tasan, M. L. Lai, J. Zhang, D. Raabe

Erschienen in: Journal of Materials Science | Ausgabe 17/2015

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Abstract

Cold-worked alloys exhibit high strength, but suffer from limited ductility. In contrast, Ti-based gum metal was reported to exhibit high strength combined with good ductility upon severe pre-straining. Motivated by this anomaly, we systematically studied the evolution of gum metal microstructure during severe cold working (swaging and rolling) and the resulting deformation and damage micro-mechanical mechanisms during follow-up tensile deformation. To this end, various experimental in situ and post-mortem methodologies are employed, including scanning electron microscopy imaging, high-resolution electron backscatter diffraction mapping and transmission electron microscopy. These observations reveal that intense grain refinement takes place through dislocation plasticity-dominated deformation banding upon cold working. The observed enhancement in crack blunting and failure resistance which prolongs the post-necking ductility of gum metal during follow-up tensile straining can be attributed to the deformation-induced development of local heterogeneities in texture and grain size.

Vorheriger Artikel Development of a tight-binding model for Cu and its application to a Cu-heat-sink under irradiation

Nächster Artikel Vanadium oxide films deposited on sapphire substrate with in situ AlN stress layer: structural, electric, and optical properties

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60 % CS state was selected for these in situ SEM experiments since it provides the most optimum shear band density for further microstructural characterization. In comparison, 30 % CS state has no shear bands, 90 % CS case has too many shear bands.

It is not the result of the artefact of small gauge geometry because (i) the strain was measured using DIC; (ii) the gauge length to thickness ratio (4) was following the ASTM standard; (iii) decreasing the gauge length to 4 mm was reported to have minor influence on the mechanical properties of the material [49].

The increase in strain rate sensitivity may delay the strain localization, transforming localized necking to diffuse necking or causing double necking [39].

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Titel: Damage resistance in gum metal through cold work-induced microstructural heterogeneity
verfasst von: J.-L. Zhang
C. C. Tasan
M. L. Lai
J. Zhang
D. Raabe
Publikationsdatum: 01.09.2015
Verlag: Springer US
Erschienen in: Journal of Materials Science / Ausgabe 17/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-015-9105-y

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