Advanced Materials in Dental and Orthopedic Applications: Poster Session
Sponsored by: TMS Functional Materials Division, TMS Structural Materials Division, TMS: Biomaterials Committee
Program Organizers: Tolou Shokuhfar, University of Illinois at Chicago; Grant Crawford, South Dakota School of Mines and Technology; Terry Lowe, Colorado School of Mines; Luis Rocha, UNESP, Univ. Estadual Paulista, Faculdade de Ciências; Rajendra Kasinath, DePuy Synthes Products, LLC
Tuesday 6:00 PM
February 28, 2017
Room: Hall B1
Location: San Diego Convention Ctr
H-1: Changing in the Elastic Modulus of Ti-10Mo-Zr System Alloys by Specific Heat Treatments: Raul Araújo1; Gabriela Suárez1; Carlos Grandini1; 1UNESP/Bauru
Titanium and its alloys may have different crystalline structures depending on which substitutional element was added. The most common structures are body-centered cubic (beta phase), hexagonal compact (alfa phase). By specific heat treatments it is possible to change the structure, which cause influence on Young’s Modulus values. In this paper, it was investigated the influence of different heat treatments on the Young’s Modulus values. For this purpose, Ti-10Mo-xZr ( x = 5, 10, 15, 20 and 25 wt%) alloys were melted using an arc-furnace with argon atmosphere. Then, the ingots were submitted to homogenization heat treatment, hot rolling and solubilization heat treatment. The alloys were characterized by chemical composition, structure and microstructure, and mechanical properties like microhardness and Young’s Modulus. The results showed that the Young’s Modulus values were affected by the processing conditions (74-109 GPa). (Financial support: CNPq and FAPESP grant #2013/09063-5).
H-2: Correlation between the Presence of Martensitic Phase and Mechanical Properties of Ti-15Mo-xZr Alloys with Potential Orthopedic Application. Alloys with Potential Orthopedic Application: Fábio Vicente1; Marília Buzalaf2; Carlos Grandini3; 1UNIP; 2USP - Universidade de São Paulo; 3UNESP- Univ. Estadual Paulista
The Ti-15Mo-xZr system (x = 5, 10 and 15%) were submitted to thermal treatments in oxygen controlled atmosphere to understanding metallurgical mechanisms and relationship with the mechanical response and their microstructures. Generally, the addition of interstitial oxygen increases the hardness of alloys, due to the difficulty of dislocations motion, so that the hardness increases with the concentration of this interstitial solute. In elastic tests conducted by impulse excitation technique, there is a small change in the elastic modulus as a function of oxygen concentration and increase of the martensitic phase. Even so, the elastic modulus for the ternary alloys in all conditions have lower values compared to the cp-Ti, Ti-6Al-4V and Ti-15Mo, making the alloy a promising alternative to commercial alloys. (Financial Support: CNPq and FAPESP).
H-4: Structure and Microstructure of Ti-25Ta-Zr Alloys: Pedro Kuroda1; Fernanda Quadros1; Carlos Grandini1; 1Univ. Estadual Paulista
Titanium alloys display a unique set of properties, that increasingly its use in numerous application fields, ranging from aerospace structures to biomedical devices. The objective of this study was produce Ti-25Ta-Zr alloys, with the zirconium concentration varying from 0, 10, 20, 30 and 40wt%. The melting of the alloys was performed using an arc-melting furnace. The samples were characterized by x-ray diffraction using the powder method, optical and scanning electronic microscopy. The diffractograms were analysis by Rietveld’s method. X-ray measurements and Rietveld’s analysis revealed the presence of α' in the Ti-25Ta, the coexistence of α', α” and β in the Ti-25Ta-10Zr alloy; α” and β in Ti-25Ta-20Zr and Ti-25Ta-30Zr alloys, and only β in Ti-25Ta-40Zr alloy. These results were corroborated by microscopy results, with a microstructure composed by grains of β phase and needles of the α' and α” phases in the intra-grain region. (Financial Support: CNPq e FAPESP).
H-5: Titanium-magnesium Composite for Dental Implants (BIACOM): Martin Balog1; Mateja Snajdar2; Peter Krizik1; Zdravko Schauperl2; Zlatko Stanec3; Amir Catic3; 1The Slovak Academy of Sciences; 2Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb; 3School of Dental Medicine, University of Zagreb
We report on the study on the titanium-magnesium (Ti-Mg) bioactive metal-metal composite utilized for a fabrication of dental implants. The biocompatible Ti-12vol.%Mg composite, named BIACOM, is manufactured using a cost effective approach, where of Ti-Mg powder mixture is extruded at low temperatures. Microstructure of BIACOM comprises permanent Ti matrix and biodegradable Mg phase of low elasticity modulus. Compared to Ti Grade 4, the reference material used for dental implants, the properties of BIACOM include lower density and Young`s modulus, while the mechanical strength and fatigue performance of Ti Grade 4 are maintained. Presence of Mg, which dilutes in human body over the time after implantation, provides further decrease of Young`s modulus and yields enhanced macro and micro roughness at implants surface. As a result, BIACOM shows improved mechanical compatibility and better osseointegration potential.