Synthesis of bulk reactive Ni–Al composites using high pressure torsion
Renk O. Tkadletz M. Kostoglou N. Gunduz I.E. Fezzaa K. Sun T. Stark A. Doumanidis C.C. Eckert J. Pippan R. Mitterer C. Rebholz C.
15 March 2021Elsevier Ltd
Journal of Alloys and Compounds
2021#857
Self-propagating exothermic reactions, for instance in the nickel-aluminum (Ni–Al) system, have been widely studied to create high performance intermetallic compounds or for in-situ welding. Their easy ignition once the phase spacing is reduced below the micron scale, makes top-down methods like high-energy ball milling, ideal to fabricate such reactive nanostructures. A major drawback of ball milling is the need of a sintering step to form bulk pieces of the reactive material. However, this is not possible, as the targeted reactions would already proceed. Therefore, we investigate the ability of high pressure torsion as an alternative process, capable to produce bulk nanocomposites from powder mixtures. Severe straining of powder mixtures with a composition of 50 wt% Ni and 50 wt% Al enables fabrication of self-reactive bulk samples with microstructures similar to those obtained from ball milling or magnetron sputtering. Samples deformed at ambient temperature are highly reactive and can be ignited significantly below the Al melting point, finally predominantly consisting of Al3Ni2 and Al3Ni, independent of the applied strain. Although the reaction proceeds first at the edge of the disk, the strain gradient present in the disks does not prevent reaction of the whole sample.
High pressure torsion , Ignition , Nanocomposites , Nickel aluminides , Self-propagation reaction
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Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, 8700, Austria
Department of Materials Science, Montanuniversität Leoben, Leoben, 8700, Austria
Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, 93943, CA, United States
Advanced Photon Source, Argonne National Laboratory, Lemont, 60439, IL, United States
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht, 21502, Germany
Office of the Provost, Nazarbayev University, Astana, 010000, Kazakhstan
College of Engineering & Computer Science, Vin University, Hanoi, Viet Nam
Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, 1678, Cyprus
Erich Schmid Institute of Materials Science
Department of Materials Science
Department of Mechanical and Aerospace Engineering
Advanced Photon Source
Institute of Materials Research
Office of the Provost
College of Engineering & Computer Science
Department of Mechanical and Manufacturing Engineering
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