Abstract
In this work, friction stir processing of AZ31 alloy under pure nitrogen gas and air were studied. For this purpose, the influences of different rotating speeds (700, 900 and 1120 rpm) and environment condition on the metallurgical structure, wear and corrosion resistance were investigated. The results, obtained under optimized experimental conditions, indicated that the surface nitriding results in refining of surface grains to an average of 3 microns and its hardness enhancement by 37%. Also the corrosion potential, carried out by potentiodynamic polarization tests in simulated body fluid (SBF), showed an improvement by 160 mVs. Meanwhile, the dry sliding wear tests showed a 30% wear rate improvement occurred.
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