Limiting grain size through high-pressure torsion of different materials

Abstract

The main goal of high-pressure torsion (HPT) process is to reduce the grain size. Experiments have shown that this aim is achievable, but there is a limit in reducing the grain size. The present paper investigates this limit through a thermodynamics-based model. However, this was investigated by other researches through dislocation density-based model. At first, the validity of the model in description of the limiting grain size obtainable by HPT of different materials is examined. Then, the influence of inherent material parameters is investigated. Finally, the present results are compared with those obtained by equal channel angular pressing.

KEYWORDS:

• Thermodynamics
• modelling
• high-pressure torsion
• limiting grain size
• grain refining

Acknowledgements

The authors thank the research board of Sharif University of Technology, Iran, for the provision of the research facilities used in this work.

Disclosure statement

No potential conflict of interest was reported by the authors.