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<p>IWP lattice structures with both skeletal and sheet porous structure and volume fractions ranging from 10% to 40% were fabricated from CuCrZr alloy using selective laser melting (SLM). The as-built quality was evaluated through weight measurement, densification analysis. Quasi-static compression tests were conducted to investigate the mechanical properties and energy absorption characteristics. The effects of plasma electrolytic polishing and heat treatment were systematically analyzed. Results indicate that sheet IWP structures exhibited significant powder adhesion at the edges due to uneven thermal distribution, showing minimal weight increase with higher volume fractions. In contrast, skeletal structures demonstrated substantial increases in both weight and densification as the volume fraction increased. Mechanically, both porous structure exhibited enhanced compressive strength, elastic modulus, and plateau stress with increasing volume fraction. Plasma electrolytic polishing significantly improved the properties of structures with lower volume fractions (10%-30%), but had minimal effect on the 40% samples. Critically, for low-density structures (10–20%), plasma polishing exhibited a detrimental effect, degrading mechanical performance. Heat treatment further enhanced performance, with the heat-treated 40% sheet IWP structure achieving a compressive strength of 583&#xa0;MPa, representing a 65.15% increase over the polished condition. Energy absorption analysis revealed that SEA continuously increased with strain, while the energy absorption efficiency exhibited an initial increase followed by a decrease. Notably, the 10% skeletal structure demonstrated optimal energy absorption efficiency. This study provides significant insights for the design and post-processing optimization of IWP lattice structures.</p>

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Effect of post-processing on the mechanical properties of IWP lattice structures fabricated by selective laser melting of CuCrZr alloy

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Yuan Gao,
  • Bin Liu,
  • Yaqin Yang,
  • Zhonghua Li,
  • Zezhou Kuai,
  • Yaoxian Zhang,
  • Xiaoqing Yang,
  • Rui Wang,
  • Yinzhuo Li

摘要

IWP lattice structures with both skeletal and sheet porous structure and volume fractions ranging from 10% to 40% were fabricated from CuCrZr alloy using selective laser melting (SLM). The as-built quality was evaluated through weight measurement, densification analysis. Quasi-static compression tests were conducted to investigate the mechanical properties and energy absorption characteristics. The effects of plasma electrolytic polishing and heat treatment were systematically analyzed. Results indicate that sheet IWP structures exhibited significant powder adhesion at the edges due to uneven thermal distribution, showing minimal weight increase with higher volume fractions. In contrast, skeletal structures demonstrated substantial increases in both weight and densification as the volume fraction increased. Mechanically, both porous structure exhibited enhanced compressive strength, elastic modulus, and plateau stress with increasing volume fraction. Plasma electrolytic polishing significantly improved the properties of structures with lower volume fractions (10%-30%), but had minimal effect on the 40% samples. Critically, for low-density structures (10–20%), plasma polishing exhibited a detrimental effect, degrading mechanical performance. Heat treatment further enhanced performance, with the heat-treated 40% sheet IWP structure achieving a compressive strength of 583 MPa, representing a 65.15% increase over the polished condition. Energy absorption analysis revealed that SEA continuously increased with strain, while the energy absorption efficiency exhibited an initial increase followed by a decrease. Notably, the 10% skeletal structure demonstrated optimal energy absorption efficiency. This study provides significant insights for the design and post-processing optimization of IWP lattice structures.