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vol.8 issue4Study of the non-linear stress-strain behavior in Ti-Nb-Zr alloysProduction of titanium alloys for advanced aerospace systems by powder metallurgy author indexsubject indexarticles search
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Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373

Abstract

SANTOS, Dalcy Roberto dos; HENRIQUES, Vinicius André Rodrigues; CAIRO, Carlos Alberto Alves  and  PEREIRA, Marcelo dos Santos. Production of a low young modulus titanium alloy by powder metallurgy. Mat. Res. [online]. 2005, vol.8, n.4, pp.439-442. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392005000400014.

Titanium alloys have several advantages over ferrous and non-ferrous metallic materials, such as high strengthto-weight ratio and excellent corrosion resistance. A blended elemental titanium powder metallurgy process has been developed to offer low cost commercial products. The process employs hydride-dehydride (HDH) powders as raw material. In this work, results of the Ti-35Nb alloy sintering are presented. This alloy due to its lower modulus of elasticity and high biocompatibility is a promising candidate for aerospace and medical use. Samples were produced by mixing of initial metallic powders followed by uniaxial and cold isostatic pressing with subsequent densification by isochronal sintering between 900 up to 1600 °C, in vacuum. Sintering behavior was studied by means of microscopy and density. Sintered samples were characterized for phase composition, microstructure and microhardness by X-ray diffraction, scanning electron microscopy and Vickers indentation, respectively. Samples sintered at high temperatures display a fine plate-like a structure and intergranular b. A few remaining pores are still found and density above 90% for specimens sintered in temperatures over 1500 °C is reached.

Keywords : powder metallurgy; titanium alloys; modulus of elasticity; near-net-shape.

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