Hot Workability, Microstructural Control and Rate‐Controlling Mechanisms in Cast‐Homogenized AZ31 Magnesium Alloy

Prasad, Y. V. R. K.; Rao, K.P.

doi:10.1002/adem.200800204

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…The hot working behavior of cast-homogenized AZ31 alloy was characterized in detail in an earlier publication [19]. For the purpose of comparison, the processing map obtained on this material is shown in Figure 3, which exhibits three domains in the temperature and strain rate ranges as follows: (1) .…”

Section: Cast-homogenized Az31 Alloymentioning

confidence: 99%

“…In addition, a regime of flow instability occurs at temperatures higher than 475 °C and strain rates higher than about 0.3 s . Detailed microstructural analysis in the three domains above indicated that they represent DRX process [19].…”

Section: Cast-homogenized Az31 Alloymentioning

confidence: 99%

“…The aim of the present investigation is to evaluate the influence of extrusion temperature on the hot working characteristics of AZ31 extruded product through its effect primarily on the texture developed in the starting material. With a view to bring out the effect of texture, the results obtained on the extruded alloy have been compared with those obtained on cast-homogenized AZ31 [19] with a near-random texture.…”

Section: Introductionmentioning

confidence: 99%

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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: Cast-homogenized Az31 Alloymentioning

confidence: 99%

Section: Cast-homogenized Az31 Alloymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…4, the power dissipation efficiency increases with strain increasing at lower strain rates (\0.010 s -1 ), whereas at higher strain rates, it decreases with strain increasing. Figure 4 shows that at different strains, the map exhibits two distinct domains as follows: (1) Domain I As reported by Prasad and Rao [20,21], the distinct domain exhibiting in the power dissipation map can be correlated with individual microstructural mechanism. Figure 5 shows the sampling locations of the microstructures in the deformed specimens and the corresponding microstructures of the specimens deformed at 300°C/ 0.001 s -1 and 400°C/0.001 s -1 are shown in Fig.…”

Section: D Power Dissipation Mapsmentioning

confidence: 58%

3D processing map for hot working of extruded AZ80 magnesium alloy

Liu

Cui

2016

Rare Met.

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The hot deformation behavior of extruded AZ80 magnesium alloy was investigated using compression tests in the temperature range of 250-400°C and strain rate range of 0.001-1.000 s -1 . The 3D power dissipation map was developed to evaluate the hot deformation mechanisms and determine the optimal processing parameters. Two domains of dynamic recrystallization were identified from the 3D power dissipation map, with one occurring in the temperature and strain rate range of 250-320°C and 0.001-0.010 s -1 and the other one occurring in the temperature and strain rate range of 380-400°C and 0.001-0.003 s -1 . In order to delineate the regions of flow instability, Prasad's instability criterion, Murty's instability criterion and Gegel's stability criteria were employed to develop the 3D instability maps. Through microstructural examination, it is found that Prasad's and Murty's instability criteria are more effective than Gegel's stability criteria in predicting the flow instability regions for extruded AZ80 alloy. Further, the 3D processing maps were integrated into finite element simulation and the predictions of the simulation are in good agreement with the experimental results.

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“…Prasad and Rao [15], through analysis of stress-strain data for cast-homogenized AZ31 in the temperature range of 300-550°C, found three distinct stress exponents and associated these exponents with rate-controlling mechanisms through the activation energy: dislocation climb (4.26); grain boundary self diffusion (6.14); pyramidal slip with cross-slip as the rate controlling process (3.35). Karimi et al [14], using jump tests over a range of temperature and work hardening state, demonstrate response ranging from rate-insensitivity to a stress exponent of 3 (or a strain rate sensitivity of 0.33).…”

Section: Introductionmentioning

confidence: 99%

A study of stress relaxation in AZ31 using high-energy X-ray diffraction

et al. 2015

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a b s t r a c tThe micro-plasticity of the Mg alloy AZ31 is explored through high-energy X-ray diffraction (HEXD). Through cyclic loading of the sample, a softening response is found to follow the resolved shear stress for basal slip. Stress relaxation is studied by applying an incremental elongation increase while continuously collecting images from a detector array. The rate exponent associated with a particular reflection is developed by evaluating the average lattice strain in the loading direction from the composite detector image collected at a particular point in time, and then following the time evolution. A distinct rate exponent is identified for grain orientations that have a propensity for slip on second-order pyramidal planes, highlighting the capability to capture the simultaneous action of different deformation mechanisms through HEXD.

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Hot Workability, Microstructural Control and Rate‐Controlling Mechanisms in Cast‐Homogenized AZ31 Magnesium Alloy

Cited by 9 publications

References 26 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

3D processing map for hot working of extruded AZ80 magnesium alloy

A study of stress relaxation in AZ31 using high-energy X-ray diffraction

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