Applicability of friction-assisted tube straining method to produce high-strength copper tubes
This paper shows the capability of friction-assisted tube straining (FATS) method to fabricate high-strength long tubes. For this reason, copper tubes were successfully processed via 1–7 passes of the FATS. Mechanical properties of the processed tubes were investigated via longitudinal and peripheral tensile tests. Polarize microscopy and scanning electron microscopy were executed to study microstructure evolutions. Finite element analysis was used to determine strain and temperature fields. Results show significant improvement in mechanical properties where flow stress, ultimate tensile stress, and microhardness increased 9.3, 1.8, and 2 times more than the initial values. Average grain size of the FATSed tube was significantly decreased to 1.4 μm from an initial value 30 μm after 7 passes. Investigation of the tensile properties of the longitudinal and the peripheral samples resulted in a maximum 19% anisotropy which was considerably improved comparison with the same SPD methods.
KeywordsFriction Microstructure Strain Grain refinement Mechanical anisotropy Microhardness
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Conflict of interest
The authors declare that they have no conflict of interest.
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