Abstract
Unique and ultrafine microstructures are achieved through metal powder bed fusion additive manufacturing (AM) processes. However, a gradient in the microstructure through the height of tall-enough samples can be observed due to different cooling rates and heating–cooling cycles experienced by different locations. In the current study, a vertically built sample of AlSi10Mg with a rectangular cross section was manufactured through direct metal laser sintering (DMLS) process. The microstructure was studied at the bottom and top of the sample. From the bottom to the top of the DMLS -AlSi10Mg sample, fewer heating–cooling cycles were experienced by the material. Moreover, the cooling rate was different due to change of the thermal boundaries and cooling conditions. The microstructure of the DMLS -AlSi10Mg was analyzed using multi-scale characterization techniques including EBSD and APT . The microstructure characteristics were correlated to the solidification conditions experienced by the material.
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Acknowledgements
The authors would like to acknowledge Natural Sciences and Engineering Research Council of Canada (NSERC) project number RGPIN-2016-04221 and New Brunswick Innovation Foundation project number (NBIF)-RIF2017-071 for the financial support of this work. The authors would also like to acknowledge Dr. Mark Kozdras at CanmetMATERIALS for facilitating the research. APT analysis was carried out at the Canadian Centre for Electron Microscopy (CCEM), a facility supported by McMaster University, the Canada Foundation for Innovation under the Major Science Initiative program and NSERC.
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© 2019 The Minerals, Metals & Materials Society
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Hadadzadeh, A., Amirkhiz, B.S., Langelier, B., Li, J., Mohammadi, M. (2019). Evolution of a Gradient Microstructure in Direct Metal Laser Sintered AlSi10Mg. In: TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05861-6_30
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DOI: https://doi.org/10.1007/978-3-030-05861-6_30
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