caa a22 4500 463231058 CHVBK 20180405153242.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-1118-0 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1118-0 Deformation behavior and mechanisms of a nanocrystalline multi-phase aluminum alloy [Elektronische Daten] [Leon Shaw, Hong Luo] A nanocrystalline (nc) Al-Fe-Cr-Ti alloy containing 30 vol.% nc intermetallic particles has been used to investigate deformation behavior and mechanisms of nc multi-phase alloys. High compressive strengths at room and elevated temperatures have been demonstrated. However, tensile fracture strengths below 300°C are lower than the corresponding maximum strengths in compression. Creep flow of the nc fcc-Al grains is suppressed even though rapid dynamic recovery has occurred. It is argued that the compressive strength at ambient temperature is controlled by propagation of dislocations into nc fcc-Al grains, whereas the compressive strength at elevated temperature is determined by dislocation propagation as well as dynamic recovery. The low tensile fracture strengths and lack of ductility at temperatures below 300°C are attributed to the limited dislocation storage capacity of nanoscale grains. Since the deformation of the nc Al-alloy is controlled by dislocation propagation into nc fcc-Al grains, the smaller the grain size, the higher the strength. This new microstructural design methodology coupled with ductility-improving approaches could present opportunities for exploiting nc materials in structural applications at both ambient and elevated temperatures. Springer Science+Business Media, LLC, 2006 Shaw Leon Department of Materials Science and Engineering, University of Connecticut, 06269, Storrs, CT, USA aut Luo Hong Department of Materials Science and Engineering, University of Connecticut, 06269, Storrs, CT, USA aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1415-1426 0022-2461 42:5<1415 2007 42 10853 https://doi.org/10.1007/s10853-006-1118-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1118-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shaw Leon Department of Materials Science and Engineering, University of Connecticut, 06269, Storrs, CT, USA aut NATIONALLICENCE 700 1- Luo Hong Department of Materials Science and Engineering, University of Connecticut, 06269, Storrs, CT, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1415-1426 0022-2461 42:5<1415 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer