http://imechanica.org/node/578 Comments for "Nanostructured Metals Reveal Their Secret Strengthening Mechanisms" en http://imechanica.org/node/578 <p><span>It is well known that metals are hardened by deformation and soften by annealing. How about nanostructured metals? Can we reply on conventional metal-working lore? In a paper in Science (Huang et al., <a href="http://www.sciencemag.org/cgi/content/abstract/312/5771/249">Science, 312 (2006) 249</a>), Xiaoxu Huang and colleagues at the Riso National Laboratory, Denmark and Osaka University, Japan have found that nanostructured aluminum behaves in contrast to the conventional theories; annealing makes it stronger and tougher whereas deformation (cold working) gains ductility with a trade-off of lowering the strength. The structural scale affects fundamental mechanisms of dislocation-dislocation and dislocation-interface reactions. This finding may stimulate the applied mechanics community to study the fundamental strengthening mechanisms of nanostructured materials from both experimental and theoretical approaches.</span></p> <br class="clear" /> http://imechanica.org/node/578#comments research dislocation nucleation; nanograin; nanophenomena Sat, 16 Dec 2006 13:06:43 -0500 Xiaodong Li 578 at http://imechanica.org