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Micromechanical Modeling of AlSi10Mg Processed by Laser-Based Additive Manufacturing: From as-Built to Heat-Treated

Aravindh Nammalvar Raja Rajan1, Marcel Krochmal2, Thomas Wegener2

  • 1Institute of Mechanical Engineering, Westphalian University of Applied Sciences, Neidenburger Straße 43, 45897 Gelsenkirchen, Germany.

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Summary

Heat treatment significantly alters the microstructure and mechanical properties of additively manufactured AlSi10Mg. Accurate computational modeling, combining crystal plasticity for aluminum and J2 plasticity for silicon phases, successfully predicts tensile behavior, enabling tailored heat treatments for specific applications.

Keywords:
J2 plasticitycrystal plasticityheat treatmentlaser-based powder bed fusion of metalsnanoindentationtensile behavior

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Additive Manufacturing

Background:

  • Laser-based powder bed fusion (PBF-LB/M) of AlSi10Mg alloys yields unique microstructures with high strength and strain-hardening capabilities.
  • Post-building heat treatments critically influence the microstructure and mechanical properties of additively manufactured AlSi10Mg components.
  • Accurate computational models are essential for predicting and optimizing the mechanical performance of 3D-printed materials based on their microstructural features.

Purpose of the Study:

  • To investigate the relationship between microstructural characteristics and the mechanical behavior of PBF-LB/M AlSi10Mg under tensile loading.
  • To compare the effects of as-built, direct-aged, and T6 heat-treated conditions on material properties.
  • To develop and validate a microstructure-sensitive computational model for predicting mechanical performance.

Main Methods:

  • Utilizing nanoindentation tests to calibrate constitutive models for the aluminum-rich and silicon-rich phases.
  • Employing microstructure-sensitive modeling, including crystal plasticity for the aluminum phase and J2 plasticity for the silicon-rich phase within representative volume elements.
  • Conducting experimental tensile loading tests on as-built and heat-treated PBF-LB/M AlSi10Mg samples.

Main Results:

  • Heat treatment was observed to significantly alter the sub-grain morphology of the silicon-rich phase, impacting mechanical behavior.
  • The developed computational model, integrating different plasticity models for constituent phases, accurately predicted the tensile properties of both as-built and heat-treated states.
  • Predicted results showed good agreement with experimental data, validating the modeling approach.

Conclusions:

  • The study successfully established a correlation between microstructural features and the mechanical behavior of PBF-LB/M AlSi10Mg.
  • The validated computational approach enables a deeper understanding of microstructure-property relationships in these materials.
  • This methodology can guide the tailoring of heat treatment processes for AlSi10Mg components based on application-specific requirements.