Morozova Anna, Borodin Elijah, Bratov Vladimir, Zherebtsov Sergey, Belyakov Andrey, Kaibyshev Rustam
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Belgorod 308015, Russia.
Institute of Problems of Mechanical Engineering RAS, Saint-Petersburg 199178, Russia.
Materials (Basel). 2017 Dec 6;10(12):1394. doi: 10.3390/ma10121394.
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 B. 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.
本文研究了固溶处理后的Cu-0.1Cr-0.06Zr合金在673 K温度下通过B路径进行等通道转角挤压（ECAP）时的微观结构演变和晶粒细化动力学。塑性变形过程中的微观结构变化伴随着微带的形成以及应变诱导亚晶界取向差的增加。我们认为连续动态再结晶细化了初始的粗晶粒，并从晶粒/亚晶界三叉晶界演变的角度讨论了动态再结晶动力学。使用应变指数约为1.49的修正约翰逊-梅尔-阿夫拉米-科尔莫戈罗夫关系来表示大角度晶界三叉晶界的应变依赖性。ECAP引起的严重塑性变形导致Cu-0.1Cr-0.06Zr合金显著强化。屈服强度从初始状态的60 MPa增加到总应变水平为12后的445 MPa。
