Ji-Sung Park, Min-Sik Kim, Jong-Woo Won, Seong-Woong Kim, Seong-Hoon Yi
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Investigation of the Peculiar Stress Flow Behavior of a Novel TiAl Alloy under High Strain Rate Conditions
In this study, we investigated the peculiar flow behavior during the isothermal deformation of a novel TiAl composition at 1200 °C and 1300 °C under high strain rate conditions using Gleeble® Thermal-Mechanical Simulators. The initial yield-point phenomenon, resembling strain hardening at both temperatures, is attributed to the remnant lamellar microstructure. Secondary hardening at 1200 ℃ is caused by dislocation accumulation at the grain boundaries of the α phase, without the formation of dynamically recrystallized γ lamellar grains. In-grain misorientation axes analysis revealed a shift in the dominant deformation slip mode of the α phase from the prismatic slip system to a combined prismatic and basal slip system. The disappearance of γ lamellar laths after the first strain hardening and during secondary hardening is likely initiated by a deformation-induced γ→α phase transition within the γ phase matrix by the extended dislocation with intrinsic stacking faults and occurred simultaneously in the whole γ lamellae.
期刊介绍:
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.