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

Yang, Pin; Rodriguez, Mark A.; Deibler, Lisa Anne; Jared, Bradley Howell; Griego, James J. M.; Kilgo, Alice C.; Allen, Amy; Stefan, Daniel Keith

doi:10.1557/jmr.2018.82

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

Journal Article · Tue May 29 00:00:00 EDT 2018 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2018.82· OSTI ID:1457524

Yang, Pin ^[1]; Rodriguez, Mark A. ^[1]; Deibler, Lisa Anne ^[1]; Jared, Bradley Howell ^[1]; Griego, James J. M. ^[1]; Kilgo, Alice C. ^[1]; Allen, Amy ^[1]; Stefan, Daniel Keith ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1457524

Report Number(s):: SAND--2018-6558J; 664553

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 12 Vol. 33; ISSN 0884-2914; ISSN applab

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Ad Hoc Heat Treatments for Selective Laser Melted Alsi10mg Alloy Aimed at Stress-Relieving and Enhancing Mechanical Performances Fiocchi, J.; Biffi, C. A.; Colombo, C. JOM, Vol. 72, Issue 3 https://doi.org/10.1007/s11837-019-03973-z	journal	January 2020
Microstructure evolution and thermal properties of an additively manufactured, solution treatable AlSi10Mg part Yang, Pin; Deibler, Lisa A.; Bradley, Donald R. Journal of Materials Research, Vol. 33, Issue 23 https://doi.org/10.1557/jmr.2018.405	journal	November 2018

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