Topic
Volume fraction
About: Volume fraction is a research topic. Over the lifetime, 16312 publications have been published within this topic receiving 374181 citations.
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15 Jun 2000-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the intrinsic mechanical properties of nanocrystalline metals are masked by imperfections introduced during synthesis or later heat treatment, such as gas-filled pores, flaws, spatially abrupt variations in grain size and recrystallized regions.
Abstract: The intrinsic mechanical properties of nanocrystalline metals are masked by imperfections introduced during synthesis or later heat treatment. These imperfections include gas-filled pores, flaws, spatially abrupt variations in grain size and recrystallized regions. Desorption studies show the presence of gases trapped in the pores at sufficient pressure to cause blistering during annealing. Larger flaws are associated with regions of imperfect bonding of the nanocrystalline clusters. TEM examination shows the presence of recrystallized grains, their volume fraction varying with sample exposure to elevated temperature. Tensile tests on miniature samples of nanocrystalline Cu showed yield stresses of 450–600 MPa and strains to failure of 2–3% in nanocrystalline Cu, but only elastic deformation in nanocrystalline Ni with fractures stresses of 1200 and 1500 MPa. This difference in plasticity may be attributed to the smaller volume fraction of recrystallized grains in the Ni samples.
96 citations
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TL;DR: In this paper, a modified form of the Krieger-Dougherty equation is introduced to describe the dependencies of relative viscosity on both the crystal volume fraction and shear strain rate, and consequently the onset of shear-thinning behavior.
96 citations
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TL;DR: In this paper, the long-time self-diffusion coefficient and the zero-frequency effective viscosity for a suspension of spherical Brownian particles were derived by integral expressions derived by Batchelor.
Abstract: We study the long‐time self‐diffusion coefficient and the zero‐frequency effective viscosity for a suspension of spherical Brownian particles. The correction to first order in the volume fraction to the self‐diffusion coefficient and the correction to second order in the volume fraction to the effective viscosity are given by integral expressions derived by Batchelor. Using exact series expansions of the hydrodynamic interaction functions in powers of the inverse distance between centers of a pair of particles we obtain accurate values for the correction terms. We consider hard spheres with mixed slip‐stick boundary conditions as well as spherical liquid droplets with a viscosity different from the bulk.
96 citations
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TL;DR: In this article, the phase transformation accompanied by diffusion can be induced by application of stress of the order of 100 MPa. This new type of stress-induced phase transformation can decrease the β transus temperature by more than 100 K. The phase equilibrium under stressed condition was calculated by increasing the Gibbs energy of the α phase by 500 J/mol relative to that of the β phase.
96 citations
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TL;DR: In this paper, partial miscibility of poly(methyl methacrylate) (PMMA)/polycarbonate (PC) partially miscible blends were evaluated by Tg measurements from dynamic mechanical thermal analysis.
95 citations