Elevated Temperature Compression Deformation Behavior of Commercial Pure Zr Combined with the Constitutive Equation and Processing Map

Abstract

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.

Rheological Behavior of Pure Molybdenum at High Temperature Considering Strain Compensation

“…The aforementioned investigations indicated that the interrelationships between the parameters are still relatively simple; however, the power dissipation and microstructure evolution under the accumulated deformation are not understood in depth. It is worth noting that the processing map, as a method of visualization to reproduce the dynamic metallurgical processes of metallic materials, has been widely used in the processing of other metals, [ 20–22 ] but it is very unusual in molybdenum processing.…”