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Strengthening metals by narrowing grain size distributions in nickel-titanium thin films

Published online by Cambridge University Press:  19 April 2013

Xu Huang ,
David T. Wu ,
Derek Zhao  and
Ainissa G. Ramirez
Xu Huang
Affiliation:
Department of Mechanical Engineering & Materials Science, Yale University, New Haven, Connecticut 06520
David T. Wu
Affiliation:
Department of Materials Science and Engineering, Institute of High Performance Computing, A*STAR, Singapore, 138632, Singapore
Derek Zhao
Affiliation:
Department of Mechanical Engineering & Materials Science, Yale University, New Haven, Connecticut 06520
Ainissa G. Ramirez*
Affiliation:
Department of Mechanical Engineering & Materials Science, Yale University, New Haven, Connecticut 06520
*
a)Address all correspondence to this author. e-mail: ramirez@stanfordalumni.org
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Abstract

Grain size influences the mechanical strength of materials. In polycrystalline materials, strength increases with decreasing average grain size (for grains larger than 100 nm). This well-known Hall–Petch relationship typifies a strengthening mechanism, in which dislocation motion is impeded by grain boundaries. As grains become smaller, higher stresses are required to deform them. However, this formalism only considers the role of the “average” size of grains. Heterogeneous materials, however, have a broad “distribution” of grain sizes. Here we show that materials with narrowed grain size distributions have mechanical properties that differ from Hall–Petch predictions. Narrower distributions show increased strength, as their homogeneously sized grains yield at higher loads than the large grains in materials with broader grain size distributions. Plastic deformation depends on the coarsest grains, which yield first. These results suggest new routes for tailoring material properties.

Keywords

grain sizehardnessphase transformation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 10 , 28 May 2013 , pp. 1289 - 1294
Copyright
Copyright © Materials Research Society 2013 

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