Microstructure and Mechanical Properties of an Al–Mg–Si–Zr Alloy Processed by L-PBF and Subsequent Heat Treatments

Wonseok Yang, Young Gil Jung, Taeyang Kwak, Shae K. Kim, Hyunkyu Lim, Do Hyang Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The aim of this study was to develop a new Al–Mg–Si–Zr alloy with a high magnesium content to achieve a wide range of mechanical properties using heat treatment and at a lower cost. Additive manufacturing was conducted using a powder bed fusion process with various scan speeds to change the volumetric energy density and establish optimal process conditions. In addition, mechanical properties were evaluated using heat treatment under various conditions. The characterization of the microstructure was conducted by scanning electron microscopy with electron backscatter diffraction and transmission electron microscopy. The mechanical properties were determined by tensile tests. The as-built specimen showed a yield strength of 447.9 ± 3.6 MPa, a tensile strength of 493.4 ± 6.7 MPa, and an elongation of 9.6 ± 1.1%. Moreover, the mechanical properties could be adjusted according to various heat treatment conditions. Specifically, under the HT1 (low-temperature artificial aging) condition, the ultimate tensile strength increased to 503.2 ± 1.1 MPa, and under the HT2 (high-temperature artificial aging) condition, the yield strength increased to 467 ± 1.3 MPa. It was confirmed that the maximum elongation (14.3 ± 0.8%) was exhibited with the HT3 (soft annealing) heat treatment.

Original languageEnglish
Article number5089
Issue number15
Publication statusPublished - 2022 Aug

Bibliographical note

Funding Information:
This work was supported by the Core Technology Development Program for Electronic Systems Industry (20010917, Development of automotive parts to improve driving performance and passenger convenience using DfAM-based 3D printing manufacturing) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea).

Publisher Copyright:
© 2022 by the authors.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics


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