Materials 2017, 10(12), 1394; https://doi.org/10.3390/ma10121394
Grain Refinement Kinetics in a Low Alloyed Cu–Cr–Zr Alloy Subjected to Large Strain Deformation
Anna Morozova 1,*
, Elijah Borodin 2, Vladimir Bratov 2,3, Sergey Zherebtsov 4, Andrey Belyakov 1 and Rustam Kaibyshev 1
, Elijah Borodin 2, Vladimir Bratov 2,3, Sergey Zherebtsov 4, Andrey Belyakov 1 and Rustam Kaibyshev 1
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)
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-TextKeywords:
Cu–Cr–Zr alloy; grain refinement; severe plastic deformation; triple junctions; grain refinement kinetics
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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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