Spark plasma sintering has been used for the first time to prepare the ASTM F75 cobalt-chromium-molybdenum (Co-Cr-Mo) orthopaedic alloy composition using nanopowders. In the preliminary work presented in this report, the effect of processing variables on the structural features of the alloy (phases present, grain size and microstructure) has been investigated. Specimens of greater than 99.5 per...

Previous experimental work by Gundel and Wawner showed that the matrix alloy has a strong effect on reaction layer growth in Ti alloy/SCS-6 composite systems. A finite difference technique was used to model the reaction layer growth, which predicts the same trends as those exhibited by the experimental data. Matrix alloying elements such as Mo and Cr in metastable R alloys will affect the equil...

The equiatomic CoCrFeMnNi alloy and the quaternary alloys with no addition of one element were fabricated, roles alloying elements in corrosion resistance clarified. In 1 M H2SO4, passivity was mainly due to Cr. Co Fe additions also contributed decrease current density. While Ni found suppress active dissolution, Mn increased dissolution rate. without indicated superior pitting 0.1 NaCl. To imp...

0039-6028/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.susc.2009.07.045 * Corresponding author. Address: Reaction Kinetic tute of Nanochemistry and Catalysis, Chemical Resea Academy of Sciences, P.O. Box 168, H-6701 Szeged, H fax: +36 62 420 678. E-mail address: [email protected] (J. Kiss). The investigation of Rh, Mo and Rh–Mo nanosized clusters formed by physical vapor depositio...

Segregation at metal alloy surfaces is an important issue because many electrochemical and catalytic properties are directly correlated to the surface composition. We have performed density functional theory calculations for Mo segregation in MoNi(111) in the presence of chemisorbed atomic oxygen. In particular, the coverage dependence and possible adsorption-induced segregation phenomena are a...

In the paper, Ti-18Nb-5X (X = Mo and Sn) Ti-33Nb-2X Al, Sn, Fe Mo) alloys were investigated to evaluate effects of Mo, Sn doping different heat treatments on properties microstructures Ti-Nb-based alloys. The results show that Al decreased volume ?M in water-quenched Ti-33Nb-2Al alloy promoted formation ? phase furnace-cooled alloy. Fe-doping was proven stabilize phase. Sn-doping plays a compli...