Abstract
High-pressure torsion (HPT) has advanced to one of the leading severe plastic deformation (SPD) techniques over the last several years due to some unsurpassable advantages in comparison with other SPD techniques. In order to overcome the drawback of the generally small sample dimensions, novel HPT setups have been designed recently. The mechanical and microstructural results, however, may also be affected by the sample size used. To investigate the transferability of the results between different sample dimensions, a comparative study on copper was performed. The hardness distribution of different sample sizes ranging between 8 and 60 mm in diameter with a thickness of 0.6 and 12 mm was measured and accompanied with microstructural investigations. It will be shown that the results obtained from different disks are sample-size independent when some simple guidelines are obeyed. The influence of the significant factors, such as sample aspect ratio, deformation speed, and strain rate sensitivity, on the resulting mechanical and microstructural properties are discussed.
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Acknowledgments
Funding of this work was provided by the European Research Council under ERC Grant Agreement No. 340185 USMS. The authors also thank A. Leitner and V. Maier-Kiener for the indispensable support with the nanoindentation experiments.
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Manuscript submitted April 16, 2018.
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Hohenwarter, A., Pippan, R. Sample Size and Strain-Rate-Sensitivity Effects on the Homogeneity of High-Pressure Torsion Deformed Disks. Metall Mater Trans A 50, 601–608 (2019). https://doi.org/10.1007/s11661-018-4989-1
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DOI: https://doi.org/10.1007/s11661-018-4989-1