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Title: Effect of a ductility layer on the tensile strength of TiAl-based multilayer composite sheets prepared by EB-PVD

TiAl/Nb and TiAl/NiCoCrAl laminate composite sheets with a thickness of 0.4–0.6 mm and dimensions of 150 mm × 100 mm were successfully fabricated by electron beam physical vapor deposition. The microstructures of the sheets were examined, and their mechanical properties were compared with those of TiAl monolithic sheet produced by electron beam physical vapor deposition. Tensile testing was performed at room temperature and 750 °C, and the fracture surfaces were examined by scanning electron microscopy. Among the three microlaminate sheets, the TiAl/NiCoCrAl micro-laminate sheet had the best comprehensive properties at room temperature, and the TiAl/Nb micro-laminate sheet showed the ideal high-temperature strength and plasticity at 750 °C. The result was discussed in terms of metal strengthening mechanism. - Highlights: • TiAl-based multilayer foils was fabricated successfully by using EB-PVD method; • The tensile properties and micro-fracture morphologies of the sheet were investigated; • The deformation behavior of the multilayer foils was discussed.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044 (China)
  2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076 (China)
  3. Center for Composite Materials, Harbin Institute of Technology, Harbin 150001 (China)
  4. Beijing General Research Institute of Mining and Metallurgy, Beijing 100044 (China)
Publication Date:
OSTI Identifier:
22403544
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 95; 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; ALUMINIUM ALLOYS; CHROMIUM ALLOYS; COBALT ALLOYS; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; DEFORMATION; DUCTILITY; ELECTRON BEAMS; FRACTURES; LAYERS; MATERIALS TESTING; MICROSTRUCTURE; MORPHOLOGY; NICKEL ALLOYS; PHYSICAL VAPOR DEPOSITION; PLASTICITY; SCANNING ELECTRON MICROSCOPY; SHEETS; TEMPERATURE DEPENDENCE; TITANIUM ALLOYS