Scholarlink

<p>The present work investigates how localized severe plastic deformation, achieved through severe shot peening (SSP), affects the corrosion behavior of an Al–Mg–Si alloy. Optical microscopy confirms significant grain refinement, with average grain size reducing from 97&#xa0;µm in the untreated alloy to 9.7&#xa0;µm after shot peening. SEM analysis reveals that the coarse Al–Fe–Mn–Si intermetallics break down and transform into finer, uniformly distributed Mg₂Si phases, resulting in a stable microstructure that minimizes galvanic activity. Shot peening also introduces a deep compressive residual stress layer, which strengthens the surface and delays the initiation of cracks. Immersion tests reveal improved corrosion resistance, as the shot-peened sample exhibits lower weight loss (0.051&#xa0;mg) and corrosion rate (0.0031&#xa0;mpy) compared to the untreated alloy. Tafel polarization results further support this improvement, showing a shift in corrosion potential from – 871 to – 808&#xa0;mV, indicating better electrochemical stability. SEM images of corroded surfaces reveal reduced pitting and surface degradation, attributed to refined grains, compressive stresses, and a smoother morphology. Overall, the findings demonstrate that shot peening is an effective method to enhance the corrosion resistance and durability of Al–Mg–Si alloys in aggressive environments.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Localized Severe Plastic Deformation of Al–Mg–Si Alloys: A Comprehensive Study on Microstructure and Corrosion Resistance

  • 期刊论文

  • 发表日期：

    2025年12月19日

查看全文
  • Poondla Chiranjeevi,
  • Katakam SatyaNarayana,
  • N. Raghu Ram,
  • P. Bhargavi,
  • M. Zubairuddin,
  • Tarun Kumar Kotteda,
  • Shahid Tamboli,
  • Rama Bhadri Raju Chekuri

摘要

The present work investigates how localized severe plastic deformation, achieved through severe shot peening (SSP), affects the corrosion behavior of an Al–Mg–Si alloy. Optical microscopy confirms significant grain refinement, with average grain size reducing from 97 µm in the untreated alloy to 9.7 µm after shot peening. SEM analysis reveals that the coarse Al–Fe–Mn–Si intermetallics break down and transform into finer, uniformly distributed Mg₂Si phases, resulting in a stable microstructure that minimizes galvanic activity. Shot peening also introduces a deep compressive residual stress layer, which strengthens the surface and delays the initiation of cracks. Immersion tests reveal improved corrosion resistance, as the shot-peened sample exhibits lower weight loss (0.051 mg) and corrosion rate (0.0031 mpy) compared to the untreated alloy. Tafel polarization results further support this improvement, showing a shift in corrosion potential from – 871 to – 808 mV, indicating better electrochemical stability. SEM images of corroded surfaces reveal reduced pitting and surface degradation, attributed to refined grains, compressive stresses, and a smoother morphology. Overall, the findings demonstrate that shot peening is an effective method to enhance the corrosion resistance and durability of Al–Mg–Si alloys in aggressive environments.