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Title: Effect of thermal annealing on microstructure evolution and mechanical behavior of an additive manufactured AlSi10Mg part

Abstract

The powder-bed laser additive manufacturing (AM) process is widely used in the fabrication of three-dimensional metallic parts with intricate structures, where kinetically controlled diffusion and microstructure ripening can be hindered by fast melting and rapid solidification. Therefore, the microstructure and physical properties of parts made by this process will be significantly different from their counterparts produced by conventional methods. This work investigates the microstructure evolution for an AM fabricated AlSi10Mg part from its nonequilibrium state toward equilibrium state. Special attention is placed on silicon dissolution, precipitate formation, collapsing of a divorced eutectic cellular structure, and microstructure ripening in the thermal annealing process. These events alter the size, morphology, length scale, and distribution of the beta silicon phase in the primary aluminum, and changes associated with elastic properties and microhardness are reported. In conclusion, the relationship between residual stress and silicon dissolution due to changes in lattice spacing is also investigated and discussed.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1457524
Report Number(s):
SAND-2018-6558J
Journal ID: ISSN 0884-2914; applab; 664553
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 33; Journal Issue: 12; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Yang, Pin, Rodriguez, Mark A., Deibler, Lisa Anne, Jared, Bradley Howell, Griego, James J. M., Kilgo, Alice C., Allen, Amy, and Stefan, Daniel Keith. Effect of thermal annealing on microstructure evolution and mechanical behavior of an additive manufactured AlSi10Mg part. United States: N. p., 2018. Web. doi:10.1557/jmr.2018.82.
Yang, Pin, Rodriguez, Mark A., Deibler, Lisa Anne, Jared, Bradley Howell, Griego, James J. M., Kilgo, Alice C., Allen, Amy, & Stefan, Daniel Keith. Effect of thermal annealing on microstructure evolution and mechanical behavior of an additive manufactured AlSi10Mg part. United States. doi:10.1557/jmr.2018.82.
Yang, Pin, Rodriguez, Mark A., Deibler, Lisa Anne, Jared, Bradley Howell, Griego, James J. M., Kilgo, Alice C., Allen, Amy, and Stefan, Daniel Keith. Tue . "Effect of thermal annealing on microstructure evolution and mechanical behavior of an additive manufactured AlSi10Mg part". United States. doi:10.1557/jmr.2018.82. https://www.osti.gov/servlets/purl/1457524.
@article{osti_1457524,
title = {Effect of thermal annealing on microstructure evolution and mechanical behavior of an additive manufactured AlSi10Mg part},
author = {Yang, Pin and Rodriguez, Mark A. and Deibler, Lisa Anne and Jared, Bradley Howell and Griego, James J. M. and Kilgo, Alice C. and Allen, Amy and Stefan, Daniel Keith},
abstractNote = {The powder-bed laser additive manufacturing (AM) process is widely used in the fabrication of three-dimensional metallic parts with intricate structures, where kinetically controlled diffusion and microstructure ripening can be hindered by fast melting and rapid solidification. Therefore, the microstructure and physical properties of parts made by this process will be significantly different from their counterparts produced by conventional methods. This work investigates the microstructure evolution for an AM fabricated AlSi10Mg part from its nonequilibrium state toward equilibrium state. Special attention is placed on silicon dissolution, precipitate formation, collapsing of a divorced eutectic cellular structure, and microstructure ripening in the thermal annealing process. These events alter the size, morphology, length scale, and distribution of the beta silicon phase in the primary aluminum, and changes associated with elastic properties and microhardness are reported. In conclusion, the relationship between residual stress and silicon dissolution due to changes in lattice spacing is also investigated and discussed.},
doi = {10.1557/jmr.2018.82},
journal = {Journal of Materials Research},
number = 12,
volume = 33,
place = {United States},
year = {Tue May 29 00:00:00 EDT 2018},
month = {Tue May 29 00:00:00 EDT 2018}
}

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