ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the present work, titanium matrix composites reinforced with TiB, TiC, and Re2O3(Nd2O3 or Y2O3) were fabricated via common casting and hot-forging technology utilizing thechemical reaction between Ti, B4C (or C), rare earth (Re) and B2O3through homogeneously meltingin a non-consumable vacuum arc remelting furnace. In this work, Nd and Y were chosen as rare earth(Re) added in the in situ reaction. The thermodynamics of in situ synthesis reactions was studied. Theresults of X-ray diffraction (XRD) proved that no other phases appeared except for TiB, TiC andRe2O3. The microstructures of the composites were examined by optical microscopy (OM). Theresults showed that there were mainly three kinds of reinforcements: TiB whiskers, TiC particles andRe2O3particles. The reinforcements were fine and were homogeneously distributed in the matrix. Theinterfaces of TiB-Ti and Y2O3-Ti have been examined by high-resolution transmission electronmicroscopy (HREM).Transmission electron microscopy (TEM) and selected area diffraction (SAD)were used to analyze the orientation relationships of TiB-Ti, Nd2O3-Ti, and Y2O3-Ti. The mechanicalproperties at room temperature improved with the addition of TiB whiskers and TiC particlesalthough some reduction in ductility was observed. The (TiB+TiC)/Ti6242 composite withTiB:TiC=1:1 shows higher tensile strength and ductility
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.751.pdf
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