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In vitro Evaluation with 5SBF of Alloy ASTM F75 Thermally Treated with Wollastonite

Journal of Wuhan University of Technology(Materials Science) 2016年第3期31卷 487-490页

作者： MUNIZ Rodrigo ORTIZ Juan LUNA Jesus MARTINEZ Jesus RODRIGEZ Nelly HERNANDEZ Marco OROZCO Pilar equihua fabian Faculty of Engineering Autonomous University of CoahuilaCUSaltilloMexico Department of Metal Mechanics Technological Institute of SaltilloMexico Faculty of Engineering Mechanical and Electrical Autonomous University of Nuevo LeonMexico Faculty of Engineering Autonomous University of Zacatecas Faculty of Mechanical and Electrical Engineering Autonomous University of Coahuila North UnitMonclovaMexico

Samples of a cobalt-based alloy that underwent a surface treatment were evaluated. The samples, which were obtained by casting alloy ASTM F 75, were ground and polished on one side until a mirror finish was obtained. The samples were encapsulated in wollastonite （W） using uniaxial pressure, treated at 1 220 ~C for 1 h and subsequently tempered in water. The characterisation of the sample indicated that part of the ceramic encapsulating material was mechanically incorporated on the metallic surface by growth of the oxide layer of the alloy. After thermal treatment, a series of specimens were submerged in a solution with 5-fold simulated body fluid （5SBF） for 3, 5 and 21 days. Characterisation by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS） and X-ray diffraction （XRD） indicated nucleation and growth of a homogenous layer of apatite, beginning on the third day when the sample was submerged.

关键词： cobalt-based alloy wollastonite 5SBF apatite.

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Nucleation of Fe-Rich Intermetallic Phases on α-Al_(2)O_(3) Oxide Films in Al-Si Alloys

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Journal of Minerals and Materials Characterization and Engineering 2015年第1期3卷 15-25页

作者： Pilar Orozco-Gonzalez Manuel Castro-Roman Simitrio Maldonado-Ruiz Sergio Haro-Rodriguez fabian equihua-Guillen Rodrigo Muniz-Valdez Salvador Luna-Alvarez Miguel Montoya-Davila Alejandra Hernandez-Rodriguez Academic Unit of Engineering Autonomous University of ZacatecasZacatecasMexico CINVESTAV Saltillo SaltilloMexico Faculty of Engineering Autonomous University of CoahuilaMexico

Nucleation of Fe-rich intermetallic phases on α-Al2O3 oxide films was analyzed in five experimental Al-Fe-Mn-Si alloys. In an attempt to verify the role of α-Al2O3 films in nucleating Fe-rich intermetallics, experiments have been conducted under conditions where formed in situ oxide films were present. Some Fe-rich intermetallics are observed to be related with the oxide films in the microstructure, the present results are in accordance with some research that suggest that the Fe-rich intermetallic phases nucleate upon the oxide films. The intermetallic phases and α-Al2O3 films were unambiguously identified with the help of complementary techniques such as thermal analysis, SEM/EDS and X-ray diffraction.

关键词： Aluminum Alloys Intermetallics Nucleation Crystal Growth Oxide Films

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