If 'lighter, stronger, stiffer' is an application wish list that has driven the development of polymer-based composite materials, it has also prompted significant development in performance metals of reduced density. So much so that metals, in new guises and forms, have come back into contention for a range of transport applications where reinforced plastics once seemed to be the future.

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DOI: 10.1016/S1369-7021(01)80212-1