Lattice Anharmonicity in Defect-Free Pd Nanowhiskers

Loading...
Thumbnail Image
Penn collection
Departmental Papers (MSE)
Degree type
Discipline
Subject
Materials Science and Engineering
Funder
Grant number
License
Copyright date
Distributor
Related resources
Author
Chen, Lisa Y
Richter, Gunther
Sullivan, John P
Contributor
Abstract

We have investigated anharmonic behavior of Pd by applying systematic nanoscale tensile testing to near defect-free nanowhiskers offering a large range of elastic strain. We measured size-dependent deviations from bulk elastic behavior in nanowhiskers with diameters as small as ∼30  nm. In addition to size-dependent variations in Young’s modulus in the small strain limit, we measured nonlinear elasticity at strains above ∼1%. Both phenomena are attributed to higher-order elasticity in the bulklike core upon being biased from its equilibrium configuration due to the role of surface stresses in small volumes. Quantification of the size-dependent second- and third-order elastic moduli allows for calculation of intrinsic material nonlinearity parameters, e.g., δ. Comparison of the size-independent values of δ in our nanowhiskers with studies on bulk fcc metals lends further insight into the role of length scales on both elastic and plastic mechanical behavior.

Advisor
Date Range for Data Collection (Start Date)
Date Range for Data Collection (End Date)
Digital Object Identifier
Series name and number
Publication date
2012-09-18
Journal title
Volume number
Issue number
Publisher
Publisher DOI
Journal Issue
Comments
Chen, L. Y., Richter, G., Sullivan, J. P., & Gianola, D. S. (2012). Lattice Anharmonicity in Defect-Free Pd Nanowhiskers. Physical Review Letters, 125503(5). doi: http://dx.doi.org/10.1103/PhysRevLett.109.125503 © 2012 American Physical Society
Recommended citation
Collection