Journal ArticleDOI
Microstructure and Mechanical Properties of Sintered TiAl
TLDR
In this article, a laminated structure consisting of TiAl and Ti3AI was formed, which gave a high compressive yield strength accompanied by embrittlement of sintered TiAl compacts, no bending plastic deformation being observed at room temperature.Abstract:
Pulverised TiAl powder was cold isostatically pressed at 392 MPa and the resulting compact sintered at temperatures up to 1623 K to produce sintered TiAl with relative densities as high as 91%. This process formed a laminated structure consisting of TiAl and Ti3AI, which gave a high compressive yield strength accompanied by embrittlement of the sintered TiAl compacts, no bending plastic deformation being observed at room temperature. When centrifugally atomised powder melted in a CaO crucible was used, sintered TiAl specimens, apparently of full theoretical density, could be obtained by canned hipping at 1473 K under a pressure of 98 MPa. The hipped TiAl specimens had a grain size of ~20–30 μm, and grain coarsening was not observed, even when specimens were annealed for 720 ks at temperatures of 1273–1373 K. Hipped specimens annealed at 1273 K had a yield strength of 388 MN m −2 at room temperature, and bending ductilities > 0·4% were obtained. PM/0426read more
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Comparative investigation on the adhesion of hydroxyapatite coating on Ti–6Al–4V implant: A review paper
TL;DR: In this article, a review comprehensively analyzes nine techniques mostly used for deposition of hydroxyapatite (HA) onto Ti-6Al-4V alloys, and the advantages and disadvantages of each method over other techniques are discussed.
Journal ArticleDOI
Environmental effect on mechanical properties of TiAl base alloys
TL;DR: In this article, the mechanical properties of TiAl base alloys were studied with three-point bending tests in vacuum, air, and gaseous hydrogen, and it was shown that plastic deformation plays an important role in environmental embrittlement.
Journal ArticleDOI
Heat treatment of reaction-sintered hot-pressed TiAl
J.C. Rawers,W. Wrzesinski +1 more
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Plasma spraying of titanium aluminide coatings: Process parameters and microstructure
TL;DR: In this article, the authors report the process parameters that are critical to the preparation of plasma sprayed TiAl coatings, among these are the plasma gas compositions, spraying distance, spraying atmosphere (normal or low pressure) and are power.
Journal ArticleDOI
Superplastic behaviour of Ti-48at.%Al two-phase titanium aluminide compacts made from mechanically alloyed powder
TL;DR: In this article, a HIP compact of MA-processed powder having a nominal composition of Ti-48at.% Al was produced, which consisted of a large amount of TiAl(λ) and a small amount ofTi 3 Al ( α 2 ), in a completely ultra-fine equiaxed grain structure.
References
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The deformation and fracture of TiAl at elevated temperatures
TL;DR: In this paper, the tensile properties of the intermetallic compound TiAl have been determined at several temperatures in the range 25 to 1000°C, and the results indicate that the ductilebrittle transition behavior of TiAl at about 700°C is controlled by the trailinga/6 [112] partial dislocation components of the superdislocations overcoming their pinning barriers.