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<p>This research seeks to address the existing gap by exploring the relationship between composition, Shape Memory Effect (SME), corrosion resistance, and microstructure of Cu–Zn-Al alloys. Alloys were synthesized using liquid metallurgy and thermo-mechanical processing to induce a martensitic structure. The SME was evaluated using bend tests, revealing that CZA-4 (66 wt% Cu, 28 wt% Zn, 6 wt% Al) demonstrated the highest SME of 92%, attributed to its finely distributed martensitic phase. Corrosion resistance was assessed using Tafel polarization studies in freshwater, marine water, and Hank’s solution, showing that CZA-7 exhibited the best corrosion resistance in fresh and marine water (CR = 0.0183&#xa0;mm/year and CR = 0.0065&#xa0;mm/year). However, CZA-7 suffered severe pitting corrosion in Hank’s solution (CR = 20.32&#xa0;mm/year), driven by its high chloride content, as confirmed by SEM. Microstructural analysis revealed a well-defined needle-like lath martensitic structure, critical for SME, while SEM images highlighted surface degradation patterns influenced by environmental conditions and alloy composition.</p>

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Synergistic Analysis of Shape Memory Behavior, Corrosion Resistance, and Microstructural Dynamics in Cu–Zn–Al Shape Memory Alloys Across Varied Environments

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • N. Lokesh,
  • U. S. Mallik,
  • A. G. Shivasiddaramaiaha,
  • Chitrada Prasad,
  • Hanamant Yaragudri,
  • C. Durga Prasad

摘要

This research seeks to address the existing gap by exploring the relationship between composition, Shape Memory Effect (SME), corrosion resistance, and microstructure of Cu–Zn-Al alloys. Alloys were synthesized using liquid metallurgy and thermo-mechanical processing to induce a martensitic structure. The SME was evaluated using bend tests, revealing that CZA-4 (66 wt% Cu, 28 wt% Zn, 6 wt% Al) demonstrated the highest SME of 92%, attributed to its finely distributed martensitic phase. Corrosion resistance was assessed using Tafel polarization studies in freshwater, marine water, and Hank’s solution, showing that CZA-7 exhibited the best corrosion resistance in fresh and marine water (CR = 0.0183 mm/year and CR = 0.0065 mm/year). However, CZA-7 suffered severe pitting corrosion in Hank’s solution (CR = 20.32 mm/year), driven by its high chloride content, as confirmed by SEM. Microstructural analysis revealed a well-defined needle-like lath martensitic structure, critical for SME, while SEM images highlighted surface degradation patterns influenced by environmental conditions and alloy composition.