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Corrosion Behavior and Hardness of Al–M (M: Mo, Si, Ti, Cr) Alloys

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The corrosion behavior of Al–5 at.% Cr, Al–5 at.% Si, Al–5 at.% Mo and Al–5 at.% Ti produced via casting and Al–5 at.% Cr produced by high-energy ball milling and subsequent consolidation by cold pressing was studied using potentiodynamic polarization and surface analysis following constant immersion tests. Alloys were characterized using a scanning electron microscope coupled with the energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. Hardness, a representative of the strength, was also measured. The alloys produced by casting contained coarse intermetallics and therefore exhibited poor corrosion resistance. Al–5 at.% Cr alloy produced by high-energy ball milling exhibited a significantly improved corrosion resistance and hardness, which was attributed to the grain refinement to nanoscale and extended solid solubility of Cr in Al. The study indicated that the high-energy ball milling was capable of producing Al alloys with improved corrosion behavior and hardness.

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Correspondence to R. K. Gupta.

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Esquivel, J., Gupta, R.K. Corrosion Behavior and Hardness of Al–M (M: Mo, Si, Ti, Cr) Alloys. Acta Metall. Sin. (Engl. Lett.) 30, 333–341 (2017). https://doi.org/10.1007/s40195-017-0550-2

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  • DOI: https://doi.org/10.1007/s40195-017-0550-2

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