Synthesis, processing and properties of nanophase TiAl

Dc magnetron sputtering of a cast TiAl target was applied to produce nanophase TiAl powders. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Rutherford back scattering (RBS) were utilized to characterize the synthesized nanophase TiAl powders...

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Bibliographic Details
Published in:Scripta metallurgica 1991-05, Vol.25 (5), p.1161-1166
Main Authors: Chang, H., Höfler, H.J., Altstetter, C.J., Averback, R.S.
Format: Article
Language:English
Subjects:
360101 - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties
AIRCRAFT COMPONENTS
ALLOYS
ALUMINIUM ALLOYS
BACKSCATTERING
COHERENT SCATTERING
CRACK PROPAGATION
CRYSTAL STRUCTURE
DENSITY
DIFFRACTION
DUCTILITY
ELECTRON MICROSCOPY
ELECTRON TUBES
ELECTRONIC EQUIPMENT
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
LOW TEMPERATURE
MAGNETRONS
MATERIALS
MATERIALS SCIENCE
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MICROWAVE EQUIPMENT
MICROWAVE TUBES
PHYSICAL PROPERTIES
PROCESSING
SCATTERING
SPUTTERING
TENSILE PROPERTIES
TESTING
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
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Summary:Dc magnetron sputtering of a cast TiAl target was applied to produce nanophase TiAl powders. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Rutherford back scattering (RBS) were utilized to characterize the synthesized nanophase TiAl powders and consolidated pellets. The mechanical properties were studied by microhardness measurements at room temperature and elevated temperature. These were correlated to grain size and density. It is concluded that intermetallic nanophase delta -TiAl powder with an average grain size of 10 nm can be synthesized by the magnetron sputtering method in an inert gas atmosphere. Bulk pellets of intermetallic nanophase TiAl may be produced by consolidating the nanophase powders in vacuo , in situ at 250 deg C at the compaction pressure of 1 GPa. High densities > 95% of theoretical were achieved by sintering at 500 deg C without much grain growth. Hardness values for in excess of those conventional TiAl are possible. An increase of 400% was obtained. An inverse Hall--Petch relationship was observed and attributed to grain boundary sliding. Thus, it is likely that improved ductility could be achieved at room temperature, thereby making intermetallic TiAl a candidate for mechanical working even at low temperature. Graphs, Photomicrographs. 11 ref.--J.H.
ISSN:0956-716X
0036-9748
DOI:10.1016/0956-716X(91)90521-2