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Evaluation of an Al-Ce alloy for laser additive manufacturing

TitleEvaluation of an Al-Ce alloy for laser additive manufacturing
Publication TypeJournal Article
Year of Publication2017
AuthorsPlotkowski, A, Rios, O, Sridharan, N, Sims, Z, Unocic, K, Ott, RT, Dehoff, RR, Babu, SS
JournalActa Materialia
Volume126
Pagination507-519
Date Published03
Type of ArticleArticle
ISBN Number1359-6454
Accession NumberWOS:000394918500046
KeywordsAdditive manufacturing, al alloys, dendritic crystal-growth, eutectic growth, inconel 718, Materials Science, Metallurgical Engineering, Microstructure control, Microstructure modeling, microstructures, model, orientation, rapid solidification conditions, selection, stability, symmetrical
Abstract

This study focuses on the development of a design methodology for alloys in AM, using a newly developed Al-Ce alloy as an initial case study. To evaluate the candidacy of this system for directed energy deposition processes, single-line laser melts were made on cast Al-12Ce plates using three different beam velocities (100, 200, and 300 min/min). The microstructure was evaluated in the as melted and heat treated conditions (24 h at 300 degrees C). An extremely fine microstructure was observed within the melt pools, evolving from eutectic at the outer solid-liquid boundaries to a primary Al FCC dendritic/cellular structure nearer the melt-pool centerline. The observed microstructures were rationalized through the construction of a microstructure selection map for the Al-Ce binary system, which will be used to enable future alloy design. Interestingly, the heat treated samples exhibited no micro structural coarsening. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

DOI10.1016/j.actamat.2016.12.065
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Alternate JournalActa Mater.