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Evaluation of Microstructure, Mechanical Properties and Corrosion Resistance of Friction Stir-Welded Aluminum and Magnesium Dissimilar Alloys

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Abstract

Microstructure, mechanical properties and corrosion resistance of dissimilar friction stir-welded aluminum and magnesium alloys were investigated by applying three different rotational speeds at two different travel speeds. Sound joints were obtained in all the conditions. The microstructure was examined by an optical and scanning electron microscope, whereas localized chemical information was studied by energy-dispersive spectroscopy. Stir zone microstructure showed mixed bands of Al and Mg with coarse and fine equiaxed grains. Grain size of stir zone reduced compared to base metals, indicated by dynamic recrystallization. More Al patches were observed in the stir zone as rotational speed increased. X-ray diffraction showed the presence of intermetallics in the stir zone. Higher tensile strength and hardness were obtained at a high rotational speed corresponding to low travel speed. Tensile fractured surface indicated brittle nature of joints. Dissimilar friction stir weld joints showed different behaviors in different corrosive environments, and better corrosion resistance was observed at a high rotational speed corresponding to low travel speed (FW3) in a sulfuric and chloride environments. Increasing travel speed did not significantly affect on microstructure, mechanical properties and corrosion resistance as much as the rotational speed.

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Acknowledgment

The authors would like to thank Director, VNIT, Nagpur, for providing necessary facilities and constant encouragement to publish this paper. The authors would also like to thank Mrs. Varsha Patankar (Technical staff, Testing of Materials Laboratory, Department of Metallurgical and Materials Engineering) for her help in conducting mechanical testing. The authors are also thankful to Corrosion Lab, VNIT, Nagpur.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), South Ambazari Road, Nagpur, Maharashtra, 440 010, India

    Jagesvar Verma, Ravindra V. Taiwade, Sanjay G. Sapate & Awanikumar P. Patil

  2. School of Mechanical Engineering, Lovely Professional University (LPU), Phagwara, Punjab, 144411, India

    Jagesvar Verma

  3. Department of Mechanical Engineering, Visvesvaraya National Institute of Technology (VNIT), South Ambazari Road, Nagpur, Maharashtra, 440 010, India

    Ashwinkumar S. Dhoble

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  1. Jagesvar Verma
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Correspondence to Ravindra V. Taiwade.

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Verma, J., Taiwade, R.V., Sapate, S.G. et al. Evaluation of Microstructure, Mechanical Properties and Corrosion Resistance of Friction Stir-Welded Aluminum and Magnesium Dissimilar Alloys. J. of Materi Eng and Perform 26, 4738–4747 (2017). https://doi.org/10.1007/s11665-017-2877-2

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  • DOI: https://doi.org/10.1007/s11665-017-2877-2

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