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Title: Microstructure evolution in solution treated Ti15Mo alloy processed by high pressure torsion

Microstructure evolution and mechanical properties of ultra-fine grained Ti15Mo alloy processed by high pressure torsion were investigated. High pressure torsion straining resulted in strong grain refinement as-observed by transmission electron microscopy. Microhardness and light microscopy showed two distinct regions — (i) a central region with radial material flow and low microhardness (340 HV) and (ii) a peripheral region with rotational material flow and high microhardness (430 HV). Positron annihilation spectroscopy showed that the only detectable defects in the material are dislocations, whose density increases with the radial distance and the number of high pressure torsion revolutions. The local chemical environment around defects does not differ significantly from the average composition. - Highlights: • Beta-Ti alloy Ti15Mo was processed by high pressure torsion (HPT). • Lateral inhomogeneity of the microstructure and microhardness was found. • Dislocations are the only lattice defects detectable by positron annihilation. • Molybdenum is not preferentially segregated along dislocation cores.
Authors:
 [1] ;  [2] ; ;  [1] ;  [2] ; ; ;  [3]
  1. Department of Physics of Materials, Charles University in Prague (Czech Republic)
  2. Department of Low Temperature Physics, Charles University in Prague (Czech Republic)
  3. Ufa State Aviation Technical University (Russian Federation)
Publication Date:
OSTI Identifier:
22403617
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 98; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNIHILATION; DISLOCATIONS; GAMMA SPECTROSCOPY; GRAIN REFINEMENT; MICROHARDNESS; MICROSTRUCTURE; MOLYBDENUM; PLASTICITY; POSITRONS; PRESSURE DEPENDENCE; STRAINS; TITANIUM BASE ALLOYS; TORSION; TRANSMISSION ELECTRON MICROSCOPY