Abstracts - Conference Planning and Management - Iowa State ...

Time increases
core
shell
(a)
(b)
Fig.2-a) Concentration of diffusive species (aluminum and oxygen) in nanoparticle. b)Radial stress distribution in a
nanoparticle
Also, the radial stress distribution in coupled system is plotted in Fig.2-b. The diffusion induced the
tensile stress in the system, which in turn affects the diffusion process.
Reaction is coupled to mechanics through misfit (reaction) strain, change in properties and pressuredependence
of reaction kinetics. Expression for misfit strain is determined. Misfit strain creates large
stresses, which lead to expansion of the reaction zone. Various diffusion and oxidation scenarios are
investigated.
[1] Yu H. C., Yeon D. H., Li X. and X. Thornton X., Continuum simulations of the formation of
Kirkendall-effect- induced hollow cylinders in a binary substitutional alloy, Acta Materialia, 57,
2009, 5348
[2] Rai A., Park K., Zhou L., and Zachariah M.R., Understanding the mechanism of aluminum
nanoparticle oxidation, Combustion and theory modeling, 10, 2006, 843.
Society of Engineering Science ▪ 47 th Annual Technical Meeting 40