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<p>Magnesium shows the highest damping capacity among all metallic materials. In dynamic applications, damping capacity significantly affects the performance and reliability of engineering components. In this study, the effect of annealing time on the damping capacity of hot-extruded commercially pure Mg was investigated. The analysis involved examining the microstructure, hardness, frequency-dependent, and temperature-dependent damping capacities of samples taken from as-cast, extruded, and annealed magnesium. The grain size was varied by extruding the magnesium at 250&#xa0;°C in a ratio of 16:1, followed by annealing at 350&#xa0;°C for various holding times, i.e., 2, 4, and 8&#xa0;hr. The grain size decreased from 771 to 19&#xa0;μm immediately after extrusion, resulting in an approximately 16% increase in the hardness. An increase in annealing time resulted in grain growth (up to 41&#xa0;μm) and reduced hardness by up to 7%. The damping properties were characterized using a resonance frequency damping analyzer (RFDA) and dynamic mechanical&#xa0;analyzer (DMA) under free and forced vibrations, respectively. Longer annealing time showed improved damping capacity after extrusion, with 8-hr annealed specimens exhibiting the highest damping performance among the extruded and annealed samples. As-cast magnesium showed the highest damping at room temperature, while the extruded samples showed the highest damping above 160&#xa0;°C.</p>

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Effect of Annealing Time on the Damping Properties of Hot-Extruded Commercial Pure Magnesium

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Shardendu Shukla,
  • T. G. Nikhil,
  • A. Srinivasan,
  • R. Arockia Kumar

摘要

Magnesium shows the highest damping capacity among all metallic materials. In dynamic applications, damping capacity significantly affects the performance and reliability of engineering components. In this study, the effect of annealing time on the damping capacity of hot-extruded commercially pure Mg was investigated. The analysis involved examining the microstructure, hardness, frequency-dependent, and temperature-dependent damping capacities of samples taken from as-cast, extruded, and annealed magnesium. The grain size was varied by extruding the magnesium at 250 °C in a ratio of 16:1, followed by annealing at 350 °C for various holding times, i.e., 2, 4, and 8 hr. The grain size decreased from 771 to 19 μm immediately after extrusion, resulting in an approximately 16% increase in the hardness. An increase in annealing time resulted in grain growth (up to 41 μm) and reduced hardness by up to 7%. The damping properties were characterized using a resonance frequency damping analyzer (RFDA) and dynamic mechanical analyzer (DMA) under free and forced vibrations, respectively. Longer annealing time showed improved damping capacity after extrusion, with 8-hr annealed specimens exhibiting the highest damping performance among the extruded and annealed samples. As-cast magnesium showed the highest damping at room temperature, while the extruded samples showed the highest damping above 160 °C.