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Materials 2017, 10(12), 1394; doi:10.3390/ma10121394

Grain Refinement Kinetics in a Low Alloyed Cu–Cr–Zr Alloy Subjected to Large Strain Deformation

1
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Belgorod 308015, Russia
2
Institute of Problems of Mechanical Engineering RAS, Saint-Petersburg 199178, Russia
3
Department of Elasticity, Saint-Petersburg State University, Saint-Petersburg 199034, Russia
4
Laboratory of Bulk Nanostructured Materials, Belgorod State University, Belgorod 308015, Russia
*
Author to whom correspondence should be addressed.
Received: 14 November 2017 / Revised: 29 November 2017 / Accepted: 4 December 2017 / Published: 6 December 2017
(This article belongs to the Special Issue Dynamic Recrystallization and Microstructural Evolution in Alloys)
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Abstract

This paper investigates the microstructural evolution and grain refinement kinetics of a solution-treated Cu–0.1Cr–0.06Zr alloy during equal channel angular pressing (ECAP) at a temperature of 673 K via route BC. The microstructural change during plastic deformation was accompanied by the formation of the microband and an increase in the misorientations of strain-induced subboundaries. We argue that continuous dynamic recrystallization refined the initially coarse grains, and discuss the dynamic recrystallization kinetics in terms of grain/subgrain boundary triple junction evolution. A modified Johnson–Mehl–Avrami–Kolmogorov relationship with a strain exponent of about 1.49 is used to express the strain dependence of the triple junctions of high-angle boundaries. Severe plastic deformation by ECAP led to substantial strengthening of the Cu–0.1Cr–0.06Zr alloy. The yield strength increased from 60 MPa in the initial state to 445 MPa after a total strain level of 12. View Full-Text
Keywords: Cu–Cr–Zr alloy; grain refinement; severe plastic deformation; triple junctions; grain refinement kinetics Cu–Cr–Zr alloy; grain refinement; severe plastic deformation; triple junctions; grain refinement kinetics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Morozova, A.; Borodin, E.; Bratov, V.; Zherebtsov, S.; Belyakov, A.; Kaibyshev, R. Grain Refinement Kinetics in a Low Alloyed Cu–Cr–Zr Alloy Subjected to Large Strain Deformation. Materials 2017, 10, 1394.

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