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B. P. Kashyap

Bio: B. P. Kashyap is an academic researcher from Indian Institute of Technology Kanpur. The author has contributed to research in topics: Strain rate & Strain hardening exponent. The author has an hindex of 1, co-authored 1 publications receiving 13 citations.

Papers
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TL;DR: In this paper, banded and elongated grain microstructures of the Pb-Sn eutectic alloy were analyzed over 298 to 443 K to evaluate microstructural instability during differential strain rate tests in the superplastic region.
Abstract: Stress (σ)-strain rate (\(\dot \varepsilon \)) data of banded and elongated grain microstructures of the Pb-Sn eutectic alloy were analysed over 298 to 443 K to evaluate microstructural instability during differential strain rate tests in the superplastic region. With reference to a stable equiaxed microstructure exhibiting uniqueσ-\(\dot \varepsilon \) relation, banded structure is more susceptible to strain hardening while the elongated grain microstructure exhibits either strain softening or strain hardening depending on the test temperature. This flow behaviour is considered in terms of a change in grain size, represented by the cube root of the grain volume. Activation energy for grain growth calculated from the differential strain rate test data indicates that the activation energy depends on strain rate and type of microstructure.

13 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a method is developed for accurately determining strain rate sensitivities on a submicron scale using an indentation technique, which has been developed for use with the Nanoindenter.

385 citations

Journal ArticleDOI
TL;DR: The microstructural aspects of the superplastic phenomenon are reviewed in this article, where experimental results of a very large number of investigations are critically analysed in the context of: grain shape and size; grain growth; grain boundary sliding and migration, grain rotation and rearrangement; diffusion and dislocation activity.
Abstract: The microstructural aspects of the superplastic phenomenon are reviewed. The experimental results of a very large number of investigations are critically analysed in the context of: grain shape and size; grain growth; grain boundary sliding and migration, grain rotation and rearrangement; diffusion and dislocation activity. It is shown, that in spite of often conflicting evidence in the literature, a common pattern of microstructural behaviour emerges for all the materials and conditions investigated to date.

124 citations

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TL;DR: The metallurgy and mechanical behaviour of the principal solder types based on lead-tin alloys are reviewed in this article, with particular emphasis on their performance under simulated service conditions, fatigue, creep and ageing, and life prediction.
Abstract: The metallurgy and mechanical behaviour of the principal solder types based on lead-tin alloys are reviewed. Particular emphasis is placed upon their performance under simulated service conditions, fatigue, creep and ageing, and life prediction. Requirements for improved and more environmentally compatible solders are explored.

118 citations

Journal ArticleDOI
TL;DR: The influence of microstructure coarsening on thermomechanical fatigue behavior of eutectic solder joint is investigated by numerical simulation and a phase growth model is selected based on the experimental observation and incorporated in a damage mechanics based viscoplastic constitutive model.
Abstract: The influence of microstructure coarsening on thermomechanical fatigue behavior of eutectic solder joint is investigated by numerical simulation. A phase growth model is selected based on the experimental observation and incorporated in a damage mechanics based viscoplastic constitutive model. Comparisons between the simulations with and without coarsening effect are made for isothermal, cyclic shear testing and thermal cycling of solder joints in BGA electronic packaging.

41 citations

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TL;DR: In this paper, a commercial aluminum alloy 7475 containing iron, silicon and chromium and processed for fine grain size was found to deform superplastically when tested at 730 K. The activation energy for superplastic flow is nearly equal to that for lattice diffusion, and the stress exponent is approximately equal to 2.

39 citations