Showing papers by "Bhagwati Prasad Kashyap published in 2006"
TL;DR: In this paper, a three-dimensional numerical simulation was performed to show that coarsening and grain growth was affected by particle arrangement in sintering of identical spheres, and that particle rearrangement changed the coordination number, and retarded the coarsing.
Abstract: Three-dimensional numerical simulation was performed to show that coarsening and grain growth was affected by particle arrangement in sintering of identical spheres. In the sintering of a row of three spheres the center particle with the coordination number of 2 coarsened, while particles on both sides with coordination number of 1 shrank and disappeared. The particles on both sides disappeared in a shorter time with increasing ratio of grain boundary energy γgb to surface energy γS. A new bond between two particles on both sides was created during sintering of three spheres with bond angle of 70°. This particle rearrangement changed the coordination number, and retarded the coarsening.
9 citations
TL;DR: In this article, the authors found that α/β brass with the composition of Zn-56·9Cu-3·5Pb (wt-%) were deformed to failure at constant initial strain rates ϵ of 1 × 10−4 and 1 ×10−2 s−1 in the temperature range of 297−973 K. This behavior is attributed to the liquid metal embrittlement owing to the presence of lead in this material.
Abstract: Tensile specimens of α/β brass with the composition of Zn–56·9Cu–3·5Pb (wt-%) were deformed to failure at constant initial strain rates ϵ of 1 × 10−4 and 1 × 10−2 s−1 in the temperature range of 297−973 K. Unlike the superplastic behaviour of α/β brass, this material was found to exhibit much lower ductility with the minimum values being 11·2 and 16·2% around 873 K at ϵ=1 × 10−4 s− 1 and 1 × 10−2 s−1 respectively. This behaviour is attributed to the liquid metal embrittlement owing to the presence of lead in this material. As biased by the embrittling effect, rather than thermally activated deformation process, the evaluation of ductility δ and strain rate sensitivity index m as a function of temperature suggests an anomalous relationship between δ and m.
4 citations