Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7867255 | Materials Science and Engineering: C | 2016 | 18 Pages |
Abstract
Titanium has an allotropic transformation around 883 °C. Below this temperature, the crystalline structure is hexagonal close-packed (α phase), changing to body-centered cubic (β phase). Zirconium has the same allotropic transformation around 862 °C. Molybdenum has body-centered cubic structure, being a strong β-stabilizer for the formation of titanium alloys. In this paper, the effect of substitutional molybdenum was analyzed on the structure, microstructure and selected mechanical properties of Ti-20 Zr-Mo (wt%) alloys to be used in biomedical applications. The samples were prepared by arc-melting and characterized by x-ray diffraction with subsequent refinement by the Rietveld method, optical and scanning electron microscopy. The mechanical properties were analyzed by Vickers microhardness and dynamic elasticity modulus. X-ray measurements and Rietveld analysis revealed the presence of αⲠphase without molybdenum, αâ²Â + αⳠphases with 2.5 wt% of molybdenum, αâ³Â + β phases with 5 and 7.5 wt% of molybdenum, and only β phase with 10 wt% of molybdenum. These results were corroborated by microscopy results, with a microstructure composed of grains of β phase and lamellae and needles of αⲠand αⳠphase in intra-grain the region. The hardness of the alloy was higher than the commercially pure titanium, due to the action of zirconium and molybdenum as hardening agents. The samples have a smaller elasticity modulus than the commercially pure titanium.
Related Topics
Physical Sciences and Engineering
Materials Science
Biomaterials
Authors
Pedro Akira Bazaglia Kuroda, MarÃlia Afonso Rabelo Buzalaf, Carlos Roberto Grandini,