On the superposition of strengthening mechanisms in dispersion strengthened alloys and metal-matrix nanocomposites: Considerations of stress and energy

Yield strength improvement in dispersion strengthened alloys and nano particle-reinforced composites by well-known strengthening mechanisms such as solid solution, grain refinement, coherent and incoherent dispersed particles, and increased dislocation density resulting from work-hardening can all b...

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Bibliographic Details
Published in:Metals and materials international 2014, 20(2), , pp.375-388
Main Authors: Ferguson, J. B., Schultz, Benjamin F., Venugopalan, Dev, Lopez, Hugo F., Rohatgi, Pradeep K., Cho, Kyu, Kim, Chang-Soo
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coherence
Dispersion hardening alloys
Engineering Thermodynamics
Heat and Mass Transfer
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Mathematical models
Metallic Materials
Precipitates
Processes
Solid Mechanics
Solid solutions
Solution strengthening
Strengthening
Yield strength
재료공학
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Summary:Yield strength improvement in dispersion strengthened alloys and nano particle-reinforced composites by well-known strengthening mechanisms such as solid solution, grain refinement, coherent and incoherent dispersed particles, and increased dislocation density resulting from work-hardening can all be described individually. However, there is no agreed upon description of how these mechanisms combine to determine the yield strength. In this work, we propose an analytical yield strength prediction model combining arithmetic and quadratic addition approaches based on the consideration of two types of yielding mechanisms; stress-activated and energy-activated. Using data available in the literature for materials of differing grain sizes, we consider the cases of solid solutions and coherent precipitates to show that they follow stress-activated behavior. Then, we applied our model with some empirical parameters to precipitationhardenable materials of various grain sizes in both coherent and incoherent precipitate conditions, which demonstrated that grain boundary and Orowan-strengthening can be treated as energy-activated mechanisms.
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-014-2017-6