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A D V A N C E D M A T E R I A L S & P R O C E S S E S | O C T O B E R 2 0 1 7 2 0 high-performance materials systems. By tuning the local geometry of a part, rather than the chemical composition of each layer, it is possible to reduce the formation of intermetallic phases that are often present in functionally grad- ed materials produced using only fu- sion-based AM processes, avoiding a major challenge in the creation of func- tionally graded parts and increasing the potential number of applications of multi-material solutions. Further, while steel and aluminum were cho- sen for the initial work in AMIPCs, this processing strategy can be extended to many other materials combinations where the components possess dissim- ilar melting temperatures. In this proof of concept work, the lattice configuration used by the ORNL/ Rice teamwas selected for its simplicity and ease of infiltration. Another oppor- tunity for improving the performance of AMIPCs is shown through recent work in mechanical metamaterials [17] , which suggests that the lattice configuration can strongly influence the observed tradeoffs in material properties. Such approaches could be incorporated into the AMIPC manufacturing process, fur- ther expanding the range of potential material properties. The authors anticipate several de- velopments in the field of additive man- ufacturing as AM processes continue to mature. Improved surface finishes re- alized by using powders with finer siz- es will enable finer details in 3D-printed parts as well as in AMIPCs. Further ad- vances in AM will reduce cost and in- crease throughput and these benefits will extend to AMIPCs as well. AMIPCs have the unique ability to tailor prop- erties of interest in specific locations where required, greatly expanding the variety of parts that may be produced through hybrid materials and manufac- turing approaches, integrating additive manufacturing into conventional in- dustries and manufacturing processes. ~AM&P For more information: Amit Shyam is a senior R&D staff member, Mechani- cal Properties and Mechanics Group, Materials Science and Technology Division,OakRidgeNationalLaboratory, 1 Bethel Valley Rd., P.O. Box 2008, Oak Ridge, TN 37831-6069, 865.241.4841, shyama@ornl.gov , www.ornl.gov . Note: This manuscript has been au- thored by UT-Battelle LLC under Con- tract No. DE-AC05-00OR22725 with the U.S. DOE. The U.S. Government re- tains and the publisher, by accepting the article for publication, acknowl- edges that the U.S. Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or re- produce the published form of this manuscript, or allow others to do so, for U.S. Government purposes. The DOE will provide public access to these results of federally sponsored re- search in accordance with the DOE Public Access Plan (http://energy.gov/ downloads/doe-public-access-plan) . Acknowledgments This project was supported by the U.S. DOE, Office of Energy Efficiency and Re- newable Energy, Vehicle Technologies Office, as part of the Propulsion Materi- als Program and by the U.S. DOE, Office of Energy Efficiency and Renewable En- ergy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle LLC. References 1. T. Wohlers, Terry; Gornett, History of additive manufacturing, in: Wohlers Rep. 2014, Wohlers Associates, 2014: pp.1–34 .http://www.wohlersassociates . com/history2014.pdf. 2. Smartech Marketing Publishing, Additive Manufacturing Opportunities in the Automotive Industry: A Ten-Year Forecast, Charlottesville, Va, 2014. http://www.smartechpublishing.com/ reports/additive-manufacturing- opportunities-in-the-automotive- industry-a-ten-year. 3. D.C. Hofmann, S. Roberts, R. Otis, J. Kolodziejska, R.P. Dillon, J. Suh, A.A. Shapiro, Z.-K. Liu, J.-P. Borgonia, Developing gradient met- al alloys through radial deposition additive manufacturing., Sci. Rep. 4 (2014) 5357. doi:10.1038/srep05357. 4. B.E. Carroll, R.A. Otis, J.P. Borgonia, J.O. Suh, R.P. Dillon, A.A. Shapiro, D.C. Hofmann, Z.K. Liu, A.M. Beese, Functionally graded material of 304L stainless steel and inconel 625 fabri- cated by directed energy deposition: Characterization and thermodynam- ic modeling, Acta Mater. 108 (2016) 46– 54. doi:10.1016/j.actamat.2016.02.019. 5. L.D. Bobbio, R.A. Otis, J.P. Borgonia, R.P. Dillon, A.A. Shapiro, Z.-K. Liu, A.M. Beese, Additive Manufacturing of a Functionally Graded Material from Ti-6Al-4V to Invar: Experimental Characterization and Thermodynamic Calculations, Submitt. Publ. under Rev. 127 (2016) 133–142. doi:10.1016/ j.actamat.2016.12.070. 6. S. Put, J. Vleugels, O. Van der Biest, Functionally graded WC–Co materials produced by electrophoretic deposi- tion, Scr. Mater. 45 (2001) 1139–1145. doi:10.1016/S1359-6462(01)01126-5. 7. E. Atzeni, A. Salmi, Economics of additive manufacturing for end-us- able metal parts, Int. J. Adv. Manuf. Technol. 62 (2012) 1147–1155. doi:10. 1007/s00170-011-3878-1. 8. A.E. Pawlowski, Z.C. Cordero, M.R. French, T.R. Muth, J. Keith Carver, R.B. Dinwiddie, A.M. Elliott, A. Shyam, D.A. Splitter, Damage-tolerant metal- lic composites via melt infiltration of additively manufactured preforms, Mater. Des. 127 (2017) 346–351. doi:10. 1016/j.matdes.2017.04.072. 9. D.R. Clarke, Interpenetrating Phase Composites, J. Am. Ceram.Soc. 75 (1992) 739–758 doi:10.1111/j.1151- 2916.1992.tb04138.x. 10. D. Horvitz, I. Gotman, E.Y. Gut- manas, N. Claussen, In situ process- ing of dense Al2O3-Ti aluminide interpenetrating phase composites, J. Eur. Ceram. Soc. 22 (2002) 947–954. doi:10.1016/S0955-2219(01)00396-X. 11. M. Hoffman, S. Skirl, W. Pompe, J. Rodel, Thermal residual strains and stresses in Al2O3/Al compos- ites with interpenetrating networks, Acta Mater. 47 (1999) 565–577. doi:10.1016/S1359-6454(98)00367-X. 12. C. San Marchi, M. Kouzeli, R. Rao, J.A. Lewis, D.C. Dunand, Alumina- aluminum interpenetrating-phase com-