Microstructure evolution and texture development during high-temperature uniaxial compression of magnesium alloy AZ31

Libor, Helis; Okayasu, Kazuto; Fukutomi, Hiroshi

doi:10.1016/j.msea.2006.04.125

Cited by 62 publications

(41 citation statements)

References 16 publications

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“…Among the wrought alloys, Mg-3Al-1Zn (AZ31) is being investigated in detail as regards processing-microstructure-property correlations [2][3][4][5][6][7][8][9][10][11]. Primary working of magnesium materials is done by the extrusion process [12][13][14][15], which is generally conducted at higher temperatures to take advantage of enhanced workability caused by the participation of non-basal slip.…”

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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“…The tilted poles of (0001) texture are similar to those reported in previous study on hot compressed Mg alloys. 6) It seems that the annealing had a small effect on the texture formed by hot forging. 9,14) Tensile test pieces with 6 mm in gauge length and 2 Â 2 mm 2 in gauge width, and compressive test pieces with 2.4 mm in height and 2 Â 2 mm 2 were cut from the samples.…”

Section: Methodsmentioning

confidence: 99%

“…1) Hot forging is one of the forming techniques of Mg alloys that achieve strengthening by grain refinement through dynamic recrystallization (DRX). [2][3][4][5][6] The strength of forged Mg parts is generally examined by room-temperature tension tests; however, when it comes to practical application of forged Mg alloy parts, various stress modes, that is, not only tension but also compression and shear, evolve in the parts. Hotworked Mg alloys often suffer from strong texture formation and subsequent mechanical anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Tension/Compression Anisotropy in Hot Forged Mg-Al-Ca-RE Alloy

et al. 2009

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Die-cast Mg-Al-Ca-RE (RE = rare earth) alloy was upset forged by compression at 573 K with the true strain rate of 0.1 s À1 for grain refinement, and the tension/compression anisotropy at room temperature was examined. Before the hot forging, the die-cast alloy had random texture and yield stresses in tension and compression were similar. However, the forged and fine-grained specimens had (0001) texture inclined by 0-20 to the forging plane, which caused tension/compression yield stress ratio of 1.4 when the specimens were deformed perpendicular to hot forging direction. Grain coarsening by annealing of the forged specimen enhanced the ratio to 1.9 because more c-axis expansion twins formed at the early stage of the compression. Thus, grain refinement is necessary for reducing tension/compression anisotropy in hot-forged Mg alloy parts.

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“…3) Two of the authors studied the formation behavior of textures in AZ31 and AZ61 magnesium alloys under high temperature uniaxial compression deformation and found that the degree of texture development and the main component changed during dynamic recrystallization with the deformation conditions. 4,5) This means that the texture can be controlled by changing the conditions of hot working.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Texture Formation in AZ80 Magnesium Alloy during Uniaxial Compression Deformation at High Temperatures

2013

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High temperature uniaxial compression deformation is conducted on AZ80 magnesium alloy at 673 and 723 K by varying the strain rates ranging from 1.0 © 10 ¹4 to 5.0 © 10 ¹2 s ¹1 in order to investigate the behaviors of deformation and texture formation. Particular attention is paid to the development of basal texture. Under the deformation conditions of this study, work softening is observed in all the stressstrain curves without exception. The results of the microstructure observation reveal occurrence of dynamic recrystallization. Formation of fiber texture during the deformation is confirmed. The main component is (0001) when the peak stresses appearing in the stressstrain curves are more than 15 20 MPa, and it develops together with an increase in the peak stress. In contrast, weak fiber textures having a main component at a position 29°a way from the basal plane are formed with deformation conditions giving peak stresses of less than 15 MPa. The stress exponent changes at a peak stress near 20 MPa, suggesting that change in the texture corresponds to the change in the deformation mechanism. It is concluded that the formation of basal texture is due to the continuous dynamic recrystallization resulting from the growth of the subgrains formed by the deformation.

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Microstructure evolution and texture development during high-temperature uniaxial compression of magnesium alloy AZ31

Cited by 62 publications

References 16 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

Tension/Compression Anisotropy in Hot Forged Mg-Al-Ca-RE Alloy

Deformation Behavior and Texture Formation in AZ80 Magnesium Alloy during Uniaxial Compression Deformation at High Temperatures

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