Ureña Alcázar, Julia MaríaTejado, E.Pastor, J.Y.Velasco López, Francisco JavierTsipas, Sophia AlexandraJiménez Morales, AntoniaGordo Odériz, Elena2018-10-012019-01-242018-01-24Powder Metallurgy, 61(2), 2018, pp. 90-99.0032-5899https://hdl.handle.net/10016/27501Invited keynotes paper from EUROPM2017, Milan.This work focuses on the evaluation of modified surfaces on Ti produced by powder metallurgy. These newly designed surface modifications are achieved by deposition and diffusion of a stable aqueous suspension prepared in one case from micro-sized Nb powder (Ti beta-stabilizer element) and in another case from Nb plus the addition of ammonium chloride, NH4Cl, (thermo-reactive diffusion process). Different design parameters such as diffusion element (Nb or Mo), state of the Ti substrate (green or sintered) and the treatment process (diffusion or thermo-reactive diffusion) lead to all the surface-modified materials, GreenTi-Nb, SintTi-Nb and Ti-Nb-NH4Cl, GreenTi-Mo, SintTi-Mo and Ti-Mo-NH4Cl. The modified Ti surfaces present a gradient in composition and microstructure (beta / alpha+beta / alpha phases) resulting in an improvement in some of their mechanical properties: (1) higher micro-hardness in all the modified materials and (2) lower elastic modulus (more similar to that of the human bone) in those without NH4Cl.9application/pdfeng© 2018 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the InstituteTitaniumSurface modificationPowder technologyMicrostructural-gradientElastic modulusHardnessresearch articleMaterialesMedicinahttps://doi.org/10.1080/00325899.2018.1426185open access90299Powder Metallurgy61AR/0000021340