2015
DOI: 10.22226/2410-3535-2015-3-240-245
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Effect of grain refinement on superplasticity in micrograined materials

Abstract: Under superplasticity conditions, micrograined materials (grain sizes in the range 1 µm -10 µm) exhibit extensive neck-free elongations during tensile deformation at elevated temperatures (T>0.5T m , where T m is the melting point). The deformation mechanism responsible for such behavior is based on grain boundary sliding accommodated by the generation and movement of lattice dislocations in the grains blocking sliding. Such a mechanism is characterized by a stress exponent of 2, an activation energy that is c… Show more

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