Characterization of dynamic recrystallisation in as-homogenized Mg–Zn–Y–Zr alloy using processing map

Wang, Y.; Zhang, Y.; Zeng, Xiaoqin; Ding, Wenjiang

doi:10.1007/s10853-005-5564-x

Cited by 37 publications

(17 citation statements)

References 17 publications

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“…The kinetic rate equation is obeyed by the data within the domains since they are "deterministic" and the data in the change-over regions (termed bifurcations) show deviations [31]. The processing-map technique has been highly successful in evaluating the hot deformation mechanisms in a wide range of Mg and its alloys [32][33][34][35][36][37][38][39][40][41] including DRX and flow instabilities.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture

Rao

Prasad²,

Dzwonczyk

et al. 2012

Metals

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Abstract:The hot deformation characteristics of AZ31 magnesium alloy rod extruded at temperatures of 300 °C, 350 °C and 450 °C have been studied in compression. The extruded material had a fiber texture with > < 0 1 10 parallel to the extrusion axis. When extruded at 450 °C, the texture was less intense and the > < 0 1 10 direction moved away from the extrusion axis. The processing maps for the material extruded at 300 °C and 350 °C are qualitatively similar to the material with near-random texture (cast-homogenized) and exhibited three dynamic recrystallization (DRX) domains. In domains #1 and #2, prismatic slip is the dominant process and DRX is controlled by lattice self-diffusion and grain boundary self-diffusion, respectively. In domain #3, pyramidal slip occurs extensively and DRX is controlled by cross-slip on pyramidal slip systems. The material extruded at 450 °C exhibited two domains similar to #1 and #2 above, which moved to higher temperatures, but domain #3 is absent. The results are interpreted in terms of the changes in > < 0 1 10 fiber texture with extrusion temperature. Highly intense > < 0 1 10 texture, as in the rod extruded at 350 °C, will enhance the occurrence of prismatic slip in domains #1 and #2 and promotes pyramidal slip at temperatures >450 °C (domain #3).

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Section: Introductionmentioning

confidence: 99%

Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture

Rao

Prasad²,

Dzwonczyk

et al. 2012

Metals

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“…[10] Similar results have been obtained for hightemperature mechanical properties of RE-containing AZ91 and ZA84 alloys. [11][12][13] Improvement in hightemperature strength has been ascribed to the formation of high melting point Al 11 RE 3 particles as strong barriers to grain boundary sliding. However, coarsening of these particles due to increasing RE pct has been introduced as the major cause for reduction of ultimate tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rare Earth Element Additions on the Impression Creep Behavior of AZ91 Magnesium Alloy

Kabirian

Mahmudi

2009

Metall Mater Trans A

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The effects of 1, 2, and 3 wt pct rare earth (RE) element additions on the microstructure and creep behavior of cast AZ91 Mg alloy were investigated by impression tests. The tests were carried out under constant punching stress in the range 200 to 650 MPa at temperatures in the range 425 to 525 K. Analysis of the data showed that for all loads and temperatures, the AZ91-2RE alloy had the lowest creep rates and, thus, the highest creep resistance among all materials tested. This is attributed to the formation of Al 11 RE 3 with a branched morphology, reduction in the volume fraction of the eutectic b-Mg 17 Al 12 phase, and solid solution hardening effects of Al in the Mg matrix. The stress exponents and activation energies were the same for all alloy systems studied, 5.3 to 6.5 and 90 to 120 kJ mol À1 , respectively, with the exception that the activation energy for the AZ91-3RE system was 102 to 126 kJ mol À1 . An observed decreasing trend of creep-activation energy with stress suggests that two parallel mechanisms of lattice and pipe diffusion-controlled dislocation climb are competing. Dislocation climb controlled by dislocation pipe diffusion is controlling at high stresses, whereas climb of edge dislocations is the controlling mechanism at low stresses.

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“…The strengthening mechanism is based on the fact that finegrained materials have a larger number of grain boundaries impeding dislocation motion [6][7][8]. For wrought magnesium alloys, grain refinement or prevention of grain coarsening is also important to improve formability [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of hot compression and annealing on microstructure evolution of ZK60 magnesium alloys

2009

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Microstructural evolution of ZK60 magnesium alloys, during twin roll cast (TRC) and hot compression (HC) with a strain rate of 0.1 s -1 at 350°C and subsequent annealing at temperatures of 250-400°C for 10 2 -5 9 10 5 s, has been observed by optical microscopy (OM), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The distribution of average grain size and recrystallized grain size at different annealing conditions were calculated. Activation energy and recrystallized volume fractions during annealing were discussed using analysis of static recrystallization (SRX) kinetics. Based on examination of microstructure evolution during annealing, it was found that several SRX mechanisms were co-activated. Subgrains with high misorientation angles to surrounding grains were formed by dislocation rearrangement, and they seemed to evolve into newly recrystallized grains.

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Characterization of dynamic recrystallisation in as-homogenized Mg–Zn–Y–Zr alloy using processing map

Cited by 37 publications

References 17 publications

Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture

Hot Deformation Mechanisms in AZ31 Magnesium Alloy Extruded at Different Temperatures: Impact of Texture

Effects of Rare Earth Element Additions on the Impression Creep Behavior of AZ91 Magnesium Alloy

Effect of hot compression and annealing on microstructure evolution of ZK60 magnesium alloys

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