j m a t e r r e s t e c h n o l . 2 0 1 5; 4(2) :180–185 www.jmrt.com.br Available online at www.sciencedirect.com Original Article Effect of the substitutional elements on the microstructure of the Ti-15Mo-Zr and Ti-15Zr-Mo systems alloys  Diego Rafael Nespeque Correa a , Fábio Bossoi Vicente a , Raul Oliveira Araújo a , Mariana Luna Lourenc ¸o a , Pedro Akira Bazaglia Kuroda a , Marília Afonso Rabelo Buzalaf b , Carlos Roberto Grandini a,* a Laboratório de Anelasticidade e Biomateriais, UNESP – Universidade Estadual Paulista, Bauru, SP, Brazil b Departamento de Ciências Biológicas, Faculdade de Odontologia de Bauru, USP – Universidade de São Paulo, Bauru, SP, Brazil a r t i c l e i n f o Article history: Received 8 August 2014 Accepted 9 February 2015 Available online 19 March 2015 Keywords: Ti alloys Biomaterials Microstructure a b s t r a c t Titanium alloys have excellent biocompatibility, and combined with their low elastic mod- ulus, become more efficient when applied in orthopedic prostheses. Samples of Ti-15Mo-Zr and Ti-15Zr-Mo system alloys were prepared using an arc-melting furnace with argon atmosphere. The chemical quantitative analysis was performed using an optical emission spectrometer with inductively coupled plasma and thermal conductivity difference. The X-ray diffractograms, allied with optical microscopy, revealed the structure and microstruc- ture of the samples. The mechanical analysis was evaluated by Vickers microhardness measurements. The structure and microstructure of alloys were sensitive to molybde- num and zirconium concentration, presenting  ′ ,  ′′ and  phases. Molybdenum proved to have greater -stabilizer action than zirconium. Microhardness was changed with addi- tion of molybdenum and zirconium, having Ti-15Zr-10Mo (436 ± 2 HV) and Ti-15Mo-10Zr (378 ± 4 HV) the highest values in each system. © 2015 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. All rights reserved. 1. Introduction The development of new biomaterials is an interdisciplinary effort that often requires a collaborative effort among doc- tors, researchers, and engineers. The implant, in addition  Paper presented in the form of an abstract as part of the proceedings of the Pan American Materials Conference, São Paulo, Brazil, July 21 st to 25 th 2014. ∗ Corresponding author. E-mail: betog@fc.unesp.br (C.R. Grandini). to not causing rejection, must possess favorable mechanical properties and preferably be bioactive, namely, stimulate cell regeneration around the implant [1]. Due to the excellent biocompatibility, corrosion resistance, and lower modulus to steels, titanium alloys have better sur- gical response in the case of dental and orthopedic implants. http://dx.doi.org/10.1016/j.jmrt.2015.02.007 2238-7854/© 2015 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. All rights reserved.