Microstructure Evolution of AZ91 Alloy Processed by Twin Parallel Channel Angular Extrusion Technique

Improvement of Hydrogenation and Dehydrogenation Kinetics of As-Cast AZ91 Magnesium Alloy via Twin Parallel Channel Angular Extrusion Processing

“…More detail on the material, the processing, and the calculations can be found in Ref. [30], published by the current authors.…”

“…The reason is the coarsening of the of the small precipitates due to the further thermomechanical processing which in turn, would lead to the grain coarsening because of the slight weakening of the pinning effect mechanism [33]. On the other hand, the fraction of β-phase precipitate remains almost constant in S4, S5, and S6 samples, indicating that the subsequent thermomechanical processing does not have any significant effect on the fraction of the precipitates after the second pass of the TPCAE; instead, more dispersion of this phase occurs, resulting in a more uniform distributed microstructure [30,33].…”

“…Table 3 illustrates the variation of mean grain size, dislocation density, and volume fraction of precipitate (β-Mg 17 Al 12 phase) during different conditions of processing. The determinations can be found elsewhere [30].…”

“…Table 3. Microstructure evolution for the TPCAE processed samples of AZ91 alloy via different processing routes [30].…”

“…Dislocation Density (×10 The primary as cast grain size is reduced via one pass of processing at 340 • C. It should be mentioned that recrystallization and precipitation happen simultaneously during plastic deformation [30]. Precipitation occurs during the processing, owing to the fact that the β phase was eliminated through the solution treatment before the processing, resulting in a supersaturated microstructure.…”