Recrystallization and grain growth of deformed magnesium alloy

Su, Chengqun; Li, Lu; Lai, M.O.

doi:10.1080/14786430701805566

Cited by 71 publications

(36 citation statements)

References 10 publications

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“…According to the results of Galiyev et al [25] on compression experiments of ZK60 alloy, in range of 473-523 K, due to the activation of prismatic and pyramidal slip systems, the deformation of ZK60 magnesium alloy was mainly accommodated by continuous dynamic recrystallization associated with dislocation slip. The same mechanism was also employed by Su et al [26,27] to explain the recrystallization process on AZ31 magnesium alloy. Since the ECAP process in the present study was carried out at 513 K, which is above the recrystallization temperature of ZK60 alloy (∼473 K), recrystallization is believed to play an important role during the ECAP process.…”

Section: Discussionmentioning

confidence: 58%

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Microstructure and mechanical properties of ZK60 alloy processed by two-step equal channel angular pressing

Pan

Qin

et al. 2010

Journal of Alloys and Compounds

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Section: Discussionmentioning

confidence: 58%

“…According to the study of Su et al [27], the recrystallization process can be considered as diffusion of atoms from one grain to the other by overcoming an activation energy through thermal activation. The velocity of the grain boundaries migration increases exponentially with temperature.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and mechanical properties of ZK60 alloy processed by two-step equal channel angular pressing

Pan

Qin

et al. 2010

Journal of Alloys and Compounds

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“…The conventional Mg alloy AZ31 annealed at such a high homologous temperature (T/T m = 0.7) exhibits much more rapid grain growth than any of the currently examined alloys, [36][37][38] despite the fact that it has a much higher solute concentration. Thus, it seems that the observed grain boundary solute segregation in Mg-Y is effective at reducing grain boundary mobility via a solute drag mechanism.…”

Section: Quantitative Grain Boundary Concentration Measurementsmentioning

confidence: 96%

Role of Solute in the Texture Modification During Hot Deformation of Mg-Rare Earth Alloys

Hadorn

Hantzsche

et al. 2011

Metall Mater Trans A

341

164

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Although conventional Mg alloys develop strong crystallographic textures during deformation that persist during annealing, the addition of rare earth (RE) elements can induce comparably weaker textures. The texture weakening effect is explored using hot-rolled Mg-Y alloys of a single phase to focus on the possibility of solute effects. Of the studied compositions, the richer alloys ( ‡0.17 at. pct) show the weakening effect, whereas the most dilute alloy (£0.03 at. pct) does not. Electron backscattered diffraction (EBSD) analysis of intragranular misorientation axes (IGMA) indicate that the geometrically necessary dislocation (GND) content in dilute, hotrolled alloys contain primarily basal hai dislocations. At higher concentrations, the dislocations are predominantly prismatic hai type. This change in the GND content suggests a change in dynamic recrystallization (DRX) mode. For example, nonbasal cross slip has been associated with continuous DRX. Furthermore, nonbasal slip might also promote more homogenous shear banding/twinning. Both of these mechanisms have been shown previously to give rise to more randomly oriented nuclei during DRX. Energy dispersive X-ray spectroscopy performed through transmission electron microscopy shows that Mg-Y exhibits significant grain boundary solute segregation, consistent with recent observations of solute clustering. Slow grain growth may be explained by solute drag. It is hypothesized that limited grain boundary mobility suppresses conventional discontinuous DRX, which has been shown to retain the deformation texture. The promotion of nonbasal slip and suppression of grain boundary mobility are proposed as solid solution-based mechanisms responsible for the observed texture weakening phenomenon in Mg rare earth alloys.

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“…[35] The usual definition of recrystallization is the formation and migration of the HAGBs driven by the stored energy of deformation. [36] The recrystallization is a nucleation and growth process. The growth is accomplished by the migration of the HAGBs.…”

Section: Recrystallization Mechanismmentioning

confidence: 99%

Microstructure and Cyclic Deformation Behavior of a Friction-Stir-Welded 7075 Al Alloy

Feng

Chen

2010

Metall Mater Trans A

120

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Microstructural changes and cyclic deformation characteristics of friction-stir-welded 7075 Al alloy were evaluated. Friction stir welding (FSW) resulted in significant grain refinement and dissolution of g¢ (Mg(Zn,Al,Cu) 2 ) precipitates in the nugget zone (NZ), but Mg 3 Cr 2 Al 18 dispersoids remained nearly unchanged. In the thermomechanically affected zone (TMAZ), a high density of dislocations was observed and some dislocations were pinned, exhibiting a characteristic Orowan mechanism of dislocation bowing. Two low-hardness zones (LHZs) between the TMAZ and the heat-affected zone (HAZ) were observed, with the width decreasing with increasing welding speed. Cyclic hardening and fatigue life increased with increasing welding speed from 100 to 400 mm/min, but were only weakly dependent on the rotational rate between 800 and 1200 rpm. The cyclic hardening of the friction-stir-welded joints exhibiting a two-stage character was significantly stronger than that of the base metal (BM) and the energy dissipated per cycle decreased with decreasing strain amplitude and increasing number of cycles. Fatigue failure occurred in the LHZs at a lower welding speed and in the NZ at a higher welding speed. Fatigue cracks initiated from the specimen surface or near-surface defects in the friction-stirwelded joints, and the initiation site exhibited characteristic intergranular cracking. Crack propagation was characterized by typical fatigue striations along with secondary cracks.

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Recrystallization and grain growth of deformed magnesium alloy

Cited by 71 publications

References 10 publications

Microstructure and mechanical properties of ZK60 alloy processed by two-step equal channel angular pressing

Microstructure and mechanical properties of ZK60 alloy processed by two-step equal channel angular pressing

Role of Solute in the Texture Modification During Hot Deformation of Mg-Rare Earth Alloys

Microstructure and Cyclic Deformation Behavior of a Friction-Stir-Welded 7075 Al Alloy

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