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<p>The present study investigates the influence of different tool rotational speeds (750, 1000, and 1250&#xa0;rpm) on the microstructural development, precipitation behavior, and corrosion resistance of friction stir-processed AZ31 alloy. Microstructural analyses revealed significant grain refinement at 1000&#xa0;rpm, producing an optimal grain size of 4.5 ± 2.6&#xa0;µm due to enhanced dynamic recrystallization (DRX). X-ray diffraction (XRD) confirmed the dissolution of secondary phases at this speed, improving mechanical stability. At 1250&#xa0;rpm, excessive heat input resulted in grain coarsening and partial reprecipitation of Mg<sub>17</sub>Al<sub>12</sub>, reducing mechanical strength and corrosion resistance. Electrochemical analysis using Open Circuit Potential (OCP) and Tafel tests indicated that 1000&#xa0;rpm provided the highest corrosion resistance, attributed to uniform grain boundaries and improved passivation. However, at 1250&#xa0;rpm, corrosion susceptibility increased due to localized galvanic effects.</p>

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Microstructural Evolution, Precipitation Behaviour, and Corrosion Behaviour of AZ31 Magnesium Alloy Processed by Friction Stir Processing at Varying Tool Rotational Speeds

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Namburi Harsha,
  • V. S. N. Venkata Ramana,
  • Koona Bhavani,
  • K. Sri Ram Vikas,
  • R. Rahul

摘要

The present study investigates the influence of different tool rotational speeds (750, 1000, and 1250 rpm) on the microstructural development, precipitation behavior, and corrosion resistance of friction stir-processed AZ31 alloy. Microstructural analyses revealed significant grain refinement at 1000 rpm, producing an optimal grain size of 4.5 ± 2.6 µm due to enhanced dynamic recrystallization (DRX). X-ray diffraction (XRD) confirmed the dissolution of secondary phases at this speed, improving mechanical stability. At 1250 rpm, excessive heat input resulted in grain coarsening and partial reprecipitation of Mg17Al12, reducing mechanical strength and corrosion resistance. Electrochemical analysis using Open Circuit Potential (OCP) and Tafel tests indicated that 1000 rpm provided the highest corrosion resistance, attributed to uniform grain boundaries and improved passivation. However, at 1250 rpm, corrosion susceptibility increased due to localized galvanic effects.