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Elevated Temperature Compression Deformation Behavior of Commercial Pure Zr Combined with the Constitutive Equation and Processing Map
Author(s) -
Wang Qingjuan,
Li Xiangjun,
Wang Kuaishe,
Zhang Bing,
Cai Jun,
Tong Libo,
Ren Yaojia,
Zeng Zhouyu,
Dang Jun
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900772
Subject(s) - materials science , microstructure , dynamic recrystallization , arrhenius equation , deformation mechanism , flow stress , activation energy , constitutive equation , thermodynamics , deformation (meteorology) , slip (aerodynamics) , dissipation , zirconium , composite material , work hardening , mechanics , metallurgy , hot working , finite element method , chemistry , physics
The compression deformation behavior of commercial pure zirconium at elevated temperature is systematically investigated at different conditions. The corresponding deformation mechanism of pure Zr is clarified for analyzed flow stress, work hardening rate, activation energy, and microstructure. A modified Arrhenius‐type equation is proposed for future numerical simulation, which shows a good relativity between the theoretical and experimental data. The apparent deformation activation energy is 209 kJ mol −1 , indicating that a cross‐slip of dominant dislocation mechanism controls the deformation process. Established based on the dynamic material model (DDM), processing maps indicate that the optimum processing conditions are 700–900 °C at 0.1–0.14 s −1 and 905–950 °C at 3–20 s −1 with the high efficiency of power dissipation. Microstructure examination reveals that the main restoration mechanism in the safe domain is related to dynamic recrystallization and the unstable regional microstructure results in the flow localization and cracking behavior.