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Title: Deformation and fracture behavior of composite structured Ti-Nb-Al-Co(-Ni) alloys

Tensile ductility of the Ti-based composites, which consist of a β-Ti phase surrounded by ultrafine structured intermetallics, is tunable through the control of intermetallics. The two Ti-based alloys studied exhibit similar compressive yield strength (about 1000 MPa) and strain (about 35%–40%) but show a distinct difference in their tensile plasticity. The alloy Ti{sub 71.8}Nb{sub 14.1}Ni{sub 7.4}Al{sub 6.7} fractures at the yield stress while the alloy Ti{sub 71.8}Nb{sub 14.1}Co{sub 7.4}Al{sub 6.7} exhibits about 4.5% of tensile plastic deformation. To clarify the effect of microstructure on the deformation behavior of these alloys, tensile tests were carried out in the scanning electron microscope. It is shown that the distribution as well as the type of intermetallics affects the tensile ductility of the alloys.
Authors:
; ; ;  [1] ;  [2] ;  [1] ;  [1] ;  [2] ; ;  [3]
  1. IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany)
  2. (Germany)
  3. Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden (Germany)
Publication Date:
OSTI Identifier:
22283120
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM ALLOYS; COBALT ALLOYS; DEFORMATION; DUCTILITY; FRACTURES; INTERMETALLIC COMPOUNDS; MICROSTRUCTURE; NIOBIUM ALLOYS; PLASTICITY; SCANNING ELECTRON MICROSCOPY; STRAINS; STRESSES; TITANIUM BASE ALLOYS; YIELD STRENGTH