Nanostructure processing for titanium-based materials

Abstract

Because of their extremely fine grain size, nanocrystalline (<100 nm) materials exhibit novel combinations of physical, mechanical, and magnetic properties. Titanium-based nanostructured materials-both terminal alloys and intermetallic compounds-show the potential for enhanced behavior aver material with more conventional grain sizes (>1 11m).

Sintering behavior of titanium–titanium nitride nanocomposite powders

“…Although there are studies available on various nanocomposites as mentioned above, there is scarce work on titanium nanocomposites [11,12,28]. The present investigation aims at studying the sintering behavior of titanium-titanium nitride nanocomposite powders by dilatometry.…”

“…Titanium nanocomposites with reinforcements of titanium nitride are likely to exhibit improved mechanical properties over conventional titanium matrix composites [12]. The processing of titanium-based nanocomposites via the powder consolidation route is complex.…”

Hot isostatic pressing of titanium based materials

“…Additionally, MA allows formation of alloys from virtually immiscible components, production of ultrafine microstructure with grain sizes reaching down to nanometer levels [17,18], and a very fine and uniform dispersion of second-phase particles which resist coarsening even at very high temperatures [16].…”

“…The application of MA to titanium-base alloys has occurred only recently [18], but already some very interesting results have been obtained mainly in terms of structural and microstructural characterization. A low density Ti-Mg alloy has been developed by substantially extending the solubility of Mg. Synthesis of Ti3Al and TiAl has been achieved by MA in one approach by combining MA with thermochemical processing.…”

Nanostructured materials: A novel approach to enhanced performance. Final report

“…While the transmission electron micrographs of the HIP'ed samples showed the presence of the B2 phase with a grain size of 2.5 pm (2,500 nm) in the non-mechanically alloyed plasma rotating electrode process powder, the B2 phase in the as-milled powders had partially transformed to the orthorhombic "0" phase, and thus all the HIP'ed samples showed a mixture of the B2 and orthorhombic phases; this was shown both by x-ray (Figure 46) and electron diffraction techniques. As in the Ti-AI samples, these two phases had widely different grain sizes, the B2 phase showing the finer grain size.…”