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Materials (Basel). 2017 Dec 6;10(12). pii: E1394. doi: 10.3390/ma10121394.

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

Author information

1
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Belgorod 308015, Russia. morozova_ai@bsu.edu.ru.
2
Institute of Problems of Mechanical Engineering RAS, Saint-Petersburg 199178, Russia. elbor7@gmail.com.
3
Institute of Problems of Mechanical Engineering RAS, Saint-Petersburg 199178, Russia. vladimir.bratov@gmail.com.
4
Department of Elasticity, Saint-Petersburg State University, Saint-Petersburg 199034, Russia. vladimir.bratov@gmail.com.
5
Laboratory of Bulk Nanostructured Materials, Belgorod State University, Belgorod 308015, Russia. zherebtsov@bsu.edu.ru.
6
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Belgorod 308015, Russia. belyakov@bsu.edu.ru.
7
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Belgorod 308015, Russia. rustam_kaibyshev@bsu.edu.ru.

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.

KEYWORDS:

Cu–Cr–Zr alloy; grain refinement; grain refinement kinetics; severe plastic deformation; triple junctions

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