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<p>This study investigates the physical, microstructural, mechanical, corrosion, and surface characteristics of additively manufactured AlSi10Mg alloy (S1) under different stress-relief (SR) heat-treated (S2, S3, and S4) conditions. The stress-relieved samples were subjected to anodizing process (12&#xa0;V and 15&#xa0;V) to alleviate the blackening, thereby enhancing corrosion performance. S4 demonstrated the highest relative density at 99.6%, but S2 produced the highest hardness value of 112.6 VHN. The S3 sample showed the biggest average particle size of 3496.5&#xa0;nm through microstructural analysis, which proved that particles had experienced significant growth. The corrosion evaluation results showed that S2 experienced the highest corrosion rate of 0.01329&#xa0;mm/year before anodization, but S3 achieved the best anodic protection at 15&#xa0;V with a corrosion rate of 1.2348 × 10⁻⁸ mm/year. The blackening performance of all surface-treated samples improved, but S4 showed the best results with its highest intensity values of 53.61 at 12&#xa0;V and 97.33 at 15&#xa0;V, which makes it more suitable for defence applications. S2 showed the most balanced properties because it achieved high hardness together with superior corrosion resistance and suitable surface properties. S3 demonstrated superior anodized corrosion protection than S4, but S4 produced the darkest blackening effect. The combination of mechanical strength with corrosion protection, surface blackening efficiency and coating quality makes S2 the greatest choice for aerospace and automotive applications.</p>

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Microstructure-property correlation in stress relieved and anodized AlSi10Mg alloy fabricated through laser powder bed fusion process

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • P. Chandramohan,
  • R. Raghu,
  • Chandan Mondal,
  • D. Pradeesh Kumar,
  • S. Saravanakumar

摘要

This study investigates the physical, microstructural, mechanical, corrosion, and surface characteristics of additively manufactured AlSi10Mg alloy (S1) under different stress-relief (SR) heat-treated (S2, S3, and S4) conditions. The stress-relieved samples were subjected to anodizing process (12 V and 15 V) to alleviate the blackening, thereby enhancing corrosion performance. S4 demonstrated the highest relative density at 99.6%, but S2 produced the highest hardness value of 112.6 VHN. The S3 sample showed the biggest average particle size of 3496.5 nm through microstructural analysis, which proved that particles had experienced significant growth. The corrosion evaluation results showed that S2 experienced the highest corrosion rate of 0.01329 mm/year before anodization, but S3 achieved the best anodic protection at 15 V with a corrosion rate of 1.2348 × 10⁻⁸ mm/year. The blackening performance of all surface-treated samples improved, but S4 showed the best results with its highest intensity values of 53.61 at 12 V and 97.33 at 15 V, which makes it more suitable for defence applications. S2 showed the most balanced properties because it achieved high hardness together with superior corrosion resistance and suitable surface properties. S3 demonstrated superior anodized corrosion protection than S4, but S4 produced the darkest blackening effect. The combination of mechanical strength with corrosion protection, surface blackening efficiency and coating quality makes S2 the greatest choice for aerospace and automotive applications.