Investigations on the surface topography, corrosion behavior, and biocompatibility of friction stir processed magnesium alloy AZ91D

Abstract

Magnesium and its alloys have been identified as potential biodegradable implant materials for orthopaedic applications considering their bone equivalent density, biocompatibility, and biodegradability. However, the rapid corrosion rate of magnesium alloys in the physiological environment is a severe problem. This study attempts to simultaneously improve the microhardness and reduce the corrosion rate of AZ91D alloy by friction stir processing. Magnesium alloy AZ91D is friction stir processed by varying the process parameters namely tool rotation speed and tool traverse speed. The effects of friction stir processing parameters on the microstructural evolution, surface topography, microhardness, and corrosion rate of AZ91D alloy are investigated using the hybrid models, which are developed by integrating the quadratic function and radial basis function. The results indicate that the optimum process parameters for friction stir processing of AZ91D alloy is 750 rpm and 45 mm min −1 . Cytotoxicity test revealed that the biocompatibility of friction stir processed AZ91D alloy is in good agreement with the biocompatibility of the AZ91D alloy.

Influence of secondary phase particles Al2O3/SiC on the microstructure and tribological characteristics of AA7075-based surface hybrid composites tailored using friction stir processing

“…Among these various processes, FSP has focused more attention on the microstructural modification of base matrix based on the principle of friction stir welding (FSW). [7][8][9][10][11] During this process, the material undergoes intense plastic deformation, which results in significant grain refinement. 12 Due to the formation of an ultrafine along with equiaxial grained structure during the refinement phase and reduced porosity level, the FSP technique has been employed for many industrial applications.…”

Microstructure, hardness and corrosion behaviour of friction-stir processed AA5083

“…This enhances the mechanical properties of the alloy, reduces its corrosion susceptibility and increases the component life. Friction stir processing (FSP) is a solid state processing techniques, which is capable of refining the surface characteristics of alloys (Mishra and Ma, 2005;Mishra et al, 2003;Vignesh et al, 2019).…”

Corrosion and Tribological Characteristics of FSPed Aluminum Alloy AA5052

“…The corrosion current density was derived from the Tafel constants. The Equation (3) and Equation (4) (Vignesh et al, 2020, Vaira Vignesh et al, 2019a, Vaira Vignesh et al, 2019b, Vaira Vignesh et al, 2020 were used to calculate the corrosion current density and corrosion rate respectively.…”