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<p>The fabrication of AA7075 alloy microarchitectured materials has been executed through laser powder bed fusion (LPBF) utilizing prealloyed powders. Microarchitectures, including I-WP, Gyroid, Hybrid (mixture of I-WP and Gyroid), and Random configurations, were designed with porosity levels ranging from 60% to 80%. A pronounced discrepancy exists between the actual porosity and CAD-derived porosity values for Gyroid microarchitectured samples. Conversely, the I-WP, hybrid, and random microarchitectured samples demonstrate negligible differences between CAD and actual porosity. Three distinct hardness regions have been delineated within the LPBF-processed samples. Region R2 corresponds to the gauge section, while regions R1 and R3 are designated as the gripping sections. Considerable variation of hardness is observed along the height of the tensile sample. The XRD pattern of the LPBF-processed sample reveals the presence of not only the primary aluminum phase but also secondary intermetallic phases such as MgZn₂ and Mg<sub>32</sub>(Al,Zn)<sub>49</sub>. Electrochemical corrosion analysis indicates an E<sub>corr</sub> of − 0.80&#xa0;V and an I<sub>corr</sub> of 2.29 × 10<sup>−6</sup> A/cm<sup>2</sup>, implying a low corrosion rate. The tensile strength is maximized for the sample subjected to the highest strain rate. Compression testing of the microarchitectured sample results in a wavy compressive stress–strain curve. For equivalent porosity values, the I-WP microarchitectured samples exhibit greater compressive stress compared to the Gyroid microarchitectured samples. The microarchitectured samples characterized by random architecture demonstrate superior deformation energy absorption per unit mass when compared to the I-WP and Gyroid microarchitectured samples. The deformation energy absorbed per unit mass by the microarchitectured samples shows an increasing trend with increasing strain rate, ultimately reaching a saturation value as the compression strain rate approaches 0.1&#xa0;s<sup>−1</sup>.</p>

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On the Deformation Energy Absorption Capabilities of Additively Manufactured AA7075 Microarchitectured Materials

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Sudipta Pramanik,
  • Koustav Ghosh

摘要

The fabrication of AA7075 alloy microarchitectured materials has been executed through laser powder bed fusion (LPBF) utilizing prealloyed powders. Microarchitectures, including I-WP, Gyroid, Hybrid (mixture of I-WP and Gyroid), and Random configurations, were designed with porosity levels ranging from 60% to 80%. A pronounced discrepancy exists between the actual porosity and CAD-derived porosity values for Gyroid microarchitectured samples. Conversely, the I-WP, hybrid, and random microarchitectured samples demonstrate negligible differences between CAD and actual porosity. Three distinct hardness regions have been delineated within the LPBF-processed samples. Region R2 corresponds to the gauge section, while regions R1 and R3 are designated as the gripping sections. Considerable variation of hardness is observed along the height of the tensile sample. The XRD pattern of the LPBF-processed sample reveals the presence of not only the primary aluminum phase but also secondary intermetallic phases such as MgZn₂ and Mg32(Al,Zn)49. Electrochemical corrosion analysis indicates an Ecorr of − 0.80 V and an Icorr of 2.29 × 10−6 A/cm2, implying a low corrosion rate. The tensile strength is maximized for the sample subjected to the highest strain rate. Compression testing of the microarchitectured sample results in a wavy compressive stress–strain curve. For equivalent porosity values, the I-WP microarchitectured samples exhibit greater compressive stress compared to the Gyroid microarchitectured samples. The microarchitectured samples characterized by random architecture demonstrate superior deformation energy absorption per unit mass when compared to the I-WP and Gyroid microarchitectured samples. The deformation energy absorbed per unit mass by the microarchitectured samples shows an increasing trend with increasing strain rate, ultimately reaching a saturation value as the compression strain rate approaches 0.1 s−1.