Principles of equal-channel angular pressing as a processing tool for grain refinement

Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions

https://material.karlov.mff.cuni.cz/people/janecek/studenti/FyzMetNano/Estrin_AM61_2013_782.pdf

Extreme grain refinement by severe plastic deformation: A wealth of challenging science

The activity of non-basal slip systems and dynamic recovery at room temperature in fine-grained AZ31B magnesium alloys

Superior light metals by texture engineering: Optimized aluminum and magnesium alloys for automotive applications

Ductility enhancement in AZ31 magnesium alloy by controlling its grain structure

The climb-controlled dislocation creep behavior was investigated in Mg–Al–Zn alloys of AZ31, AZ61 and AZ91 with different aluminum contents. The flow stress increased with the increase of aluminum content under the same deformation conditions. At high temperatures, the stress exponent was 5 and the activation energy was close to that for lattice diffusion of magnesium, whereas at low temperatures the stress exponent was 7 and activation energy was close to that for pipe diffusion for all alloys. By incorporating the effective diffusion coefficient and stacking fault energy into a constitutive equation, the dislocation creep behavior of magnesium alloys can be described by a single relation.

Dislocation creep behavior in Mg–Al–Zn alloys

Low temperature superplasticity of a fine-grained ZK60 magnesium alloy processed by equal-channel-angular extrusion

High strain rate deformation behavior of an AZ91 magnesium alloy at elevated temperatures

Dynamic recrystallization (DRX) behavior was systematically examined in two commercial Mg-Al-Zn alloys in order to clarify the relationship between deformation conditions and the resulting microstructure. The materials were deformed by upset forging at temperatures ranging from 473 to 673 K at an initial strain rate of 3.3 x 10 -2 s -1 . Grain refinement was observed during deformation. It was found that the dynamically recrystallized grain size decreases with an increasing Zener-Hollomon parameter and/or a decreasing initial grain size. A phenomenological constitutive equation was developed in order to provide a guideline for the control of the grain size of hot deformed AZ61 alloy.

https://www.jstage.jst.go.jp/article/matertrans/42/7/42_7_1200/_pdf

Hiroyuki Watanabe

Papers

Ductility enhancement in AZ31 magnesium alloy by controlling its grain structure

Dislocation creep behavior in Mg–Al–Zn alloys

Low temperature superplasticity of a fine-grained ZK60 magnesium alloy processed by equal-channel-angular extrusion

High strain rate deformation behavior of an AZ91 magnesium alloy at elevated temperatures

Grain Size Control of Commercial Wrought Mg-Al-Zn Alloys Utilizing Dynamic Recrystallization