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Effect of Molybdenum Content on Structure and Properties of a Co-Cr Biomedical Alloy

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Abstract

The present study aimed to develop several Co-Cr biomedical alloys with different amounts of molybdenum. The weight percentages of molybdenum were in the range of 0-4 wt.% in the base alloy (Co-30Cr). The microstructures, phases, density, mechanical strength, wear behavior and corrosion characteristics of these alloys were evaluated. The results showed that density, hardness and compressive strength increased by increase in Mo content in the alloy. In contrast, corrosion rate decreased when the Mo weight percentage was increased. Furthermore, addition of Mo up to 3 wt.% caused the volumetric wear loss to increase. However, 4 wt.% Mo in the alloy led to a reduction in the volumetric wear loss, even lower than that of Co-30Cr alloy without molybdenum. The variations of friction coefficient, however, were different under different operating conditions. Since no single alloy could merely satisfy all the desired characteristics, the entropy–analytic hierarchy process (AHP)–gray relational analysis (GRA) technique was utilized to select the best alloy among the examined materials. From the ranking order gained, it was indicated that M-4 (having 4 wt.% Mo) biomedical alloy possesses the best combination of all the properties.

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Acknowledgments

The authors would like to thank Advance Material Research Centre and Advance Research Centre for Tribology for their support on supplying the experimental facilities used to accomplish the present research.

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Authors and Affiliations

  1. Mechanical Engineering Department, Madhav Institute of Technology and Science, Gwalior, 474005, India

    Amit Aherwar

  2. Mechanical Engineering Department, Malaviya National Institute of Technology, Jaipur, India

    Amar Patnaik

  3. Department of Tissue Engineering and Applied Cell Sciences, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran

    Marjan Bahraminasab

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  1. Amit Aherwar
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Correspondence to Amit Aherwar.

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Aherwar, A., Patnaik, A. & Bahraminasab, M. Effect of Molybdenum Content on Structure and Properties of a Co-Cr Biomedical Alloy. J. of Materi Eng and Perform 28, 6340–6353 (2019). https://doi.org/10.1007/s11665-019-04356-w

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