TY - JOUR

T1 - Grain refinement kinetics in a low alloyed Cu-Cr-Zr alloy subjected to large strain deformation

AU - Morozova, Anna

AU - Borodin, Elijah

AU - Bratov, Vladimir

AU - Zherebtsov, Sergey

AU - Belyakov, Andrey

AU - Kaibyshev, Rustam

PY - 2017/12

Y1 - 2017/12

N2 - 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.

AB - 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.

KW - Cu-Cr-Zr alloy

KW - Grain refinement

KW - Grain refinement kinetics

KW - Severe plastic deformation

KW - Triple junctions

UR - http://www.scopus.com/inward/record.url?scp=85037345004&partnerID=8YFLogxK

U2 - 10.3390/ma10121394

DO - 10.3390/ma10121394

M3 - Article

AN - SCOPUS:85037345004

VL - 10

JO - Materials

JF - Materials

SN - 1996-1944

IS - 12

M1 - 1394

ER -