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Publisher DOI: 10.1073/pnas.1809355115
Title: Verifying Larché-Cahn elasticity, a milestone of 20th-century thermodynamics
Language: English
Authors: Shi, Shan 
Markmann, Jürgen 
Weissmüller, Jörg 
Keywords: alloy thermodynamics;elasticity;mechanochemical coupling;nanomaterials;solid mechanics
Issue Date: 5-Oct-2018
Publisher: National Acad. of Sciences
Source: Proceedings of the National Academy of Sciences of the United States of America 43 (115): 10914-10919(2018)
Journal or Series Name: Proceedings of the National Academy of Sciences of the United States of America 
Abstract (english): Many materials phenomena are governed by the interaction between chemistry and mechanics. However, it was only in the second half of the 20th century that the theory of open system elasticity by Francis Larché and John W. Cahn concatenated the fields of solid mechanics and alloy chemistry. As the theory's central materials descriptors, the open system elastic parameters describe how solids deform under stress when solute can rearrange at equilibrium while the chemical potential is held constant. Here, we report experiments verifying the predictions for these parameters. We study the elasticity of nanoporous Pd-H and Pd-Au-H during load cycles imposed by a dynamic mechanical analyzer. Short diffusion paths afford fast equilibration of H in the local strain gradients that carry the macroscopic elastic deformation. The experiment is in excellent agreement with the theory, confirming a central prediction of one of the key contributions to 20th-century thermodynamics.
DOI: 10.15480/882.2179
ISSN: 1091-6490
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
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