Nonunique dynamic equilibrium constitutive relation of metal powder depending on its microstructure

Article Abstract:

A dynamic equilibrium constitutive relation for metal powders depends on the compaction conditions. The compaction conditions such as the punch mass and initial punch velocity, influence both the number of wavefronts and the amplitudes of the strain waves. The dynamic equilibrium constitutive relation based on the microstructure is nonunique for any two compactions. The wavefronts originate during the compaction. A rise in the propagation velocity of the wavefront increases the normal Hugoniot macroscopically with the rise in the mean strain rate.

Observations, Metal powders, Compacting

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Microstructure and phase selection in laser treatment of materials

Article Abstract:

Several theoretical models for improving the microstructure and phase selection process involved in laser treatment of alloys are presented. The dendritic and eutectic growth conditions involved in the formation of a microstructure are numerically investigated under both the solidification and liquifaction phases. Results show that significant changes occur in the microstructure while in the rapid solidification regime.

Usage, Lasers, Metallography

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K variations and anisotropy: microstructure effect and numerical predictions

Article Abstract:

The K variations caused by varying grain orientation and geometry, and to explore K anisotropy due to locally preferential microstructures is investigated. It is found that the grain-orientation-geometry-induced local anisotropy produces large variations in K along front of microcracks, when the crack size is of the order of few grain diameters.

Mechanical properties, Grain boundaries

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