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HomeMaterials Science ForumMaterials Science Forum Vols. 503-504TEM Investigations of Titanium Processed by ECAP...

TEM Investigations of Titanium Processed by ECAP Followed by Cold Rolling

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Abstract:

Conventional coarse grained (CG) commercial pure (CP) Ti Grade 2 was studied after cold rolling (CR) at room temperature, and after equal channel angular pressing (ECAP) at 450° C followed by CR, by transmission electron microscopy (TEM) methods. CR of the CG material leads to a microstructure showing initially twins with (0112) type and later subgrains separated by lowangle grain boundaries. CR carried out after ECAP yields the fragmentation of fine grains (300 – 800 nm) mostly bounded by high-angle boundaries into elongated subgrains (~ 100 nm). It was shown with in-situ annealing experiments in the TEM that this microstructure is thermally stable up to a temperature of 450° C. Tensile tests showed that the combination of ECAP with CR has the potential to produce at the same time high strength (941 MPa) and high ductility (16.7%).

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Nanomaterials by Severe Plastic Deformation

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Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

805-810

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.805

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Online since:

January 2006

Authors:

Bernhard Mingler, V.V. Stolyarov, Michael J. Zehetbauer, Wolfgang Lacom, Hans Peter Karnthaler

Keywords:

Cold Rolling, Commercial Pure Ti Grade 2, Equal-Channel Angular Pressing (ECAP), In Situ Annealing, Nanostructure, TEM, Tensile Test

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