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Science 14 April 2006:
Vol. 312. no. 5771, p. 155
DOI: 10.1126/science.312.5771.155c
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This Week in Science

In traditional metalworking, a metal is cold-deformed in order to introduce dislocations that make it stronger, and then annealed to restore its ductility. As the number of dislocations increases, their movement and ability to multiply are hindered, which is the source of the strengthening. X. Huang et al. (p. 249) now show that an opposite cycle of processes can be used to prepare ductile nanostructured aluminum. During heat treatment, dislocation sources are removed, making it harder for new dislocations to form, and a subsequent deformation step restores these sources, thus enhancing the ductility.




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