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<p>Magnesium alloy wires have attracted significant attention as promising materials for biodegradable implants. However, their widespread clinical application remains constrained by several inherent limitations, including insufficient mechanical strength, limited ductility, and poor corrosion resistance. This study aims to elucidate the mechanistic effects of recrystallization annealing on enhancing the mechanical properties and corrosion resistance of Mg alloy wires, with the ultimate goal of achieving optimal performance in both aspects. The investigation focused on a Mg-2Zn-0.5Nd-0.5Zr alloy, systematically evaluating the influence of annealing temperature and duration through comprehensive microstructural characterization, tensile testing, in vitro immersion, and electrochemical analyses. The results demonstrated that an increased degree of recrystallization significantly improves both mechanical properties and corrosion resistance. This enhancement is attributed to the effective reduction of dislocation density and internal stresses within the material. Optimal performance was achieved following annealing at 400&#xa0;°C for 30&#xa0;min, yielding a superior combination of mechanical and anti-corrosion properties. The treated alloy exhibited a tensile strength of 290&#xa0;MPa, yield strength of 267&#xa0;MPa, and elongation of 14.5%, along with a corrosion rate of 0.7&#xa0;mm/year in simulated intestinal fluid. These findings provide valuable insights for the development of high-performance biodegradable Mg alloy wires for medical applications.</p>

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Regulating the Mechanical and Biodegradation Properties of Cold-Drawn Mg Alloy via Recrystallization Annealing

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Xiaoying Tian,
  • Changxin Liu,
  • Mingliang Qiao,
  • Ming Gao,
  • Lili Tan,
  • Di Na,
  • Zheng Ma

摘要

Magnesium alloy wires have attracted significant attention as promising materials for biodegradable implants. However, their widespread clinical application remains constrained by several inherent limitations, including insufficient mechanical strength, limited ductility, and poor corrosion resistance. This study aims to elucidate the mechanistic effects of recrystallization annealing on enhancing the mechanical properties and corrosion resistance of Mg alloy wires, with the ultimate goal of achieving optimal performance in both aspects. The investigation focused on a Mg-2Zn-0.5Nd-0.5Zr alloy, systematically evaluating the influence of annealing temperature and duration through comprehensive microstructural characterization, tensile testing, in vitro immersion, and electrochemical analyses. The results demonstrated that an increased degree of recrystallization significantly improves both mechanical properties and corrosion resistance. This enhancement is attributed to the effective reduction of dislocation density and internal stresses within the material. Optimal performance was achieved following annealing at 400 °C for 30 min, yielding a superior combination of mechanical and anti-corrosion properties. The treated alloy exhibited a tensile strength of 290 MPa, yield strength of 267 MPa, and elongation of 14.5%, along with a corrosion rate of 0.7 mm/year in simulated intestinal fluid. These findings provide valuable insights for the development of high-performance biodegradable Mg alloy wires for medical applications.