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Microstructures and Properties of Ultrafine-Grained Pure Titanium Processed by Equal-Channel Angular Pressing and Cold Deformation

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Abstract:

Equal-channel angular pressing (ECAP) has been used to refine the grain size of commercially pure (CP) titanium as well as other metals and alloys. CP-Ti is usually processed at about 400 °C because it lacks sufficient ductility at lower temperature. The warm processing temperature limits the ability of the ECAP technique to improve the strength of CP-Ti. We have employed cold deformation following warm ECAP to further improve the strength of CP-Ti. Ti billets were first processed for eight passes via ECAP route BC, with a clockwise rotation of 90° between adjacent passes. The grain size obtained by ECAP alone is about 260 nm. The billets were further processed by cold deformation (cold rolling) to increase the crystalline defects such as dislocations. The strength of pure Ti was improved from 380 to around 1000 MPa by the two-step process. This article reports the microstructures, microhardness, tensile properties, and thermal stability of these Ti billets processed by a combination of ECAP and cold deformation.

Keywords: COLD DEFORMATION; EQUAL-CHANNEL ANGULAR PRESSING; MICROSTRUCTURES; PROPERTIES ; TITANIUM; ULTRAFINE-GRAINED TITANIUM

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2001.034

Affiliations: 1: Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, K. Marksa 12, Russia 2: MS G755, Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA

Publication date: 2001-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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