caa a22 4500 463230892 CHVBK 20180405153241.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-1096-2 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1096-2 Structure and properties of bulk nanostructured alloys synthesized by flux-melting [Elektronische Daten] [T. Shen, X. Zhang, K. Han, C. Davy, D. Aujla, P. Kalu, R. Schwarz] Nanomaterials can easily be prepared as thin films and powders, but are much harder to prepare in bulk form. Nanostructured materials are prepared mainly by consolidation, electrodeposition, and deformation. These processing techniques have problems such as porosity, contamination, high cost, and limitations in refining the grain size. Since most bulk engineering metals are initially prepared by casting, we developed a casting technique, flux-melting and melt-solidification, to prepare bulk nanostructured alloys. The casting technique has such advantages as simplicity, low cost, and full density. In our method, Ag-Cu alloys were melted in B2O3 flux, which removed most of the impurities, mainly oxides, in the melts. Upon solidifying the melt at a relatively slow cooling rate on the order of 101-102K/s a large undercooling of ∼0.25T m (where T m is the melting temperature) was achieved. This large undercooling leads to the formation of bulk nanostructured Ag-Cu alloys composed of alternative Ag/Cu lamella and nanocrystals, both ∼50nm in dimension. Our liquid-processed alloys are fully dense and relatively free from contamination. The nanostructured Ag-Cu alloys have similar yield strength in tension and in compression. The as-quenched alloys have yield strength of 400MPa, ultimate tensile strength (UTS) of 550MPa, and plastic elongation of ∼8%. The UTS was further increased to ∼830MPa after the as-quenched alloy rod was cold drawn to a strain of ∼2. The nanostructured Ag-Cu alloys show a high electrical conductivity (∼80% that of International Annealed Copper Standard), a slight strain hardening (strain-hardening coefficient of 0.10), and a high thermal stability up to a reduced temperature of 2/3 T m. Some of these behaviors are different than those found in previous bulk nanostructured materials synthesized by solid state methods, and are explained based on the unique nanostructures achieved by our flux-melting and melt-solidification technique. Springer Science+Business Media, LLC, 2006 Shen T. Materials Science and Technology Division, Los Alamos National Laboratory, Mail Stop G755, 87545, Los Alamos, NM, USA aut Zhang X. Department of Mechanical Engineering, Texas A&M University, 77843-3123, College Station, TX, USA aut Han K. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut Davy C. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut Aujla D. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut Kalu P. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut Schwarz R. Materials Science and Technology Division, Los Alamos National Laboratory, Mail Stop G755, 87545, Los Alamos, NM, USA aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1638-1648 0022-2461 42:5<1638 2007 42 10853 https://doi.org/10.1007/s10853-006-1096-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1096-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shen T. Materials Science and Technology Division, Los Alamos National Laboratory, Mail Stop G755, 87545, Los Alamos, NM, USA aut NATIONALLICENCE 700 1- Zhang X. Department of Mechanical Engineering, Texas A&M University, 77843-3123, College Station, TX, USA aut NATIONALLICENCE 700 1- Han K. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- Davy C. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- Aujla D. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- Kalu P. National High Magnetic Field Laboratory, 1800 E Paul Dirac Dr., 32310, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- Schwarz R. Materials Science and Technology Division, Los Alamos National Laboratory, Mail Stop G755, 87545, Los Alamos, NM, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1638-1648 0022-2461 42:5<1638 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer