|Title||Tailoring and patterning the grain size of nanocrystalline alloys|
|Publication Type||Journal Article|
|Year of Publication||2007|
|Authors||Detor, AJ, Schuh, CA|
|Pagination||371 - 379|
Nanocrystalline alloys that exhibit grain boundary segregation can access thermodynamically stable or metastable states with the average grain size dictated by the alloying addition. Here we consider nanocrystalline Ni-W alloys and demonstrate that the W content controls the grain size over a very broad range: similar to 2-140 nm as compared with similar to 2-20 nm in previous work on strongly segregating systems. This trend is attributed to a relatively weak tendency for W segregation to the grain boundaries. Based upon this observation, we introduce a new synthesis technique allowing for precise composition control during the electrodeposition of Ni-W alloys, which, in turn, leads to precise control of the nanocrystalline grain size. This technique offers new possibilities for understanding the structure-property relationships of nanocrystalline solids, such as the breakdown of Hall-Petch strength scaling, and also opens the door to a new class of customizable materials incorporating patterned nanostructures. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.