Department of Metallurgical & Materials Engineering

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The flow stress was observed to depend on direction of loading relative to bands or elongated grains. There was strain dependency of flow stress at a given strain rate. This was accompanied by break up of the non-equiaxed microstructure leading to the evolution of an equiaxed structure with increasing strain.

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Transactions of the Japan Institute of Metals

INFLUENCE OF NON-EQUIAXED MICROSTRUCTURE ON THE SUPERPLASTIC BEHAVIOR OF THE Pb-Sn EUTECTIC.

The internal stress depends on strain rate, temperature and grain size and it is the major part of the applied stress in region II. The sigma //i/ sigma ratio depends more strongly on temperature than grain size in region II. The strain rate sensitivity, grain size exponent, and activation energy, based on the measured effective stress in region II are 0. 82, 2. 8 and 33. 5 kJ/mol, respectively. These data are in agreement with the Ashby-Verrall model of superplasticity. In region III, internal stress decreases to a small fraction of the applied stress with increasing temperature.

INTERNAL STRESSES IN THE HIGH TEMPERATURE DEFORMATION OF THE Pb-Sn EUTECTIC.

About 30 pct elongation at 421 K eliminated the mechanical and microstructural instabilities characteristic of the as-worked material. After prestraining, the flow stress was dependent on strain rate for a given grain size and test temperature.