Effect of extrusion ratio on the microstructure and texture evolution of AZ31 magnesium alloy by the staggered extrusion (SE)

Wang, Yan-peng; Feng, Liqiang; Wang, Ye; Li, Xuewen; Fang, Wen-win

doi:10.1016/j.jma.2020.05.013

Cited by 31 publications

(4 citation statements)

References 27 publications

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“…The maximum pole intensity statistical result (ABE: accumulative back extrusion, CDE: conventional direct extrusion, HE: hot extrusion, CVCDE: continuous variable channel direction extrusion, SE: staggered extrusion, OLTE: online twist extrusion, AABE: accumulative alternating back extrusion, EAMPR: extrusion and multi‐pass rolling, CWE: continuous welding extrusion). [ 39,42–49 ] …”

Section: Resultsmentioning

confidence: 99%

Grain Refinement, Texture Evolution, and Tensile Performance Improvement of AZ91D Magnesium Alloy Processed by Multi‐Cycle Accumulative Back Extrusion

Meng

Jing

et al. 2022

Adv Eng Mater

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Accumulative back extrusion (ABE) process is performed on an AZ91D Mg alloy at 310 °C. Microstructure, texture, and mechanical properties affected by the ABE cycles are elucidated in detail. Results reveal that the initial as‐cast grain structure (≈190 μm) is significantly refined (≈2.98 μm) after being imposed by six ABE cycles. The β‐Mg17Al12 phases undergo fragmentation and spheroidization. The dynamic recrystallization (DRX) process is accelerated through the particle stimulated nucleation (PSN) mechanism during initial deformation. Meanwhile, twins are inclined to occur in barren areas of the second phases and play a role of twinning‐induced dynamic recrystallization (TDRX). Grain refinement is governed by the combined function of PSN, TDRX, continuous dynamic recrystallization (CDRX), and discontinuous dynamic recrystallization (DDRX). Basal textures with low intensities are developed due to the fully developed recrystallized grains. Schmid factor analysis indicates that the {0001} <11–20> basal slip and the {11–22} <11–23> pyramidal slip contribute to ABE deformation. Finally, excellent ultimate tensile strength and fracture elongation are obtained after a three‐cycle ABE process, which are estimated to be 296 MPa and 21.43%, respectively. The resulting tensile performance is attributed to the refined grains, fragmented β‐Mg17Al12 particles, and the weakened basal texture.

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Section: Resultsmentioning

confidence: 99%

Grain Refinement, Texture Evolution, and Tensile Performance Improvement of AZ91D Magnesium Alloy Processed by Multi‐Cycle Accumulative Back Extrusion

Meng

Jing

et al. 2022

Adv Eng Mater

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“…The preliminary results show that due to the unique step-like stem structure of the SE process, the velocity of the extruded billet is uneven and the velocity gradient is produced at the die exit, which is one of the important inducements for the bending characteristics of the products. It is also found that the extrusion ratio λ and staggered distance h are two important factors affecting the curvature of extruded products, and both of them are proportional to the curvature of products [16,17]. In addition, the SE process has a certain effect on grain refinement, and the grain refinement is more significant with the increase of the extrusion ratio λ or the staggered distance h [18].…”

Section: Principle Of the Se Processmentioning

confidence: 90%

“…Due to the fact that the end of stem is designed as a special step structure, it not only has an important impact on the metal flow behavior, but also has a more distinct change characteristics of displacement-load curve compared with traditional extrusion. Wang et al [17] preliminary analyzed the displacement-load variation law of SE with cone angle of die. In this study, the cone angle of the die is 90°, that is, the SE of the flat die.…”

Section: 1extrusion Loadmentioning

confidence: 99%

An Analysis for Magnesium Alloy Curvature Products Formed by Staggered Extrusion (SE) Based on the Upper Bound Method

Zhang

Wang

et al. 2021

Preprint

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Staggered extrusion (SE) is a new method to solve the bottleneck of traditional curvature products, such as long manufacturing cycle, many forming processes and difficult quality control. How to quantitatively control the curvature of extruded products is the key to implement this method. Herein, the upper bound method is used to calculate and analyze the power consumption of each characteristic zone in the SE process. The theoretical model of extrusion load and curvature is established. The results show that the staggered distance h has an important influence on the curvature κ. When the staggered distance h increases from 8 mm to 24 mm and other conditions remain unchanged, the curvature κ increases from 0.0546 to 0.1607. Any combination of the staggered distance h and the extrusion ratio λ corresponds to an eccentricity ratio ξ. The eccentricity ratio ξ decreases with the increase of the staggered distance h or the extrusion ratio λ. By comparison, it can be seen that the variation trend of the theoretical predicted value and the FE modelling in the steady-state extrusion stage is consistent. The experimental results are in good agreement with the curvature theory prediction model. These results provide a scientific basis for the formulation of the SE process and precisely controlling magnesium alloy curvature products.

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“…It was proven that the ductility of the extruded alloys was improved by an increasing extrusion ratio, which is mainly attributed to by the weakened texture and the decreased dislocation density. In turn, Wang et al [21] investigated the effects of different extrusion ratios on the AZ31 magnesium alloy bending products prepared by the staggered extrusion process.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Extrusion Ratio on Load and Die Wear in the Extrusion Process

Kut

Nowotyńska

2022

Materials

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In this paper, regarding the example of concurrent extrusion of a round bar, the results of a comparative analysis of the impact of the extrusion ratio R on process parameters such as die wear intensity, extrusion force, stress intensity in the die, and its elastic deformation during extrusion are presented. The tests were carried out in a wide range of the R (1.5–11), assuming a constant outer diameter of the die. A comparative analysis of the wear was carried out in the area of the die corner radius and the calibration strip since the wear is the highest there. Based on the result obtained, it was shown that the increase in the extrusion force was not proportional to the increase in the extrusion ratio, and this could be described by a logarithmic equation. On the other hand, the value of equivalent stresses in the area of the die corner depends, to a relatively small extent, on the value of the extrusion ratio. However, due to the deformation of the die, it is most advantageous to use an extrusion ratio greater than or equal to three. Based on the wear analysis, it was estimated that the increase in the extrusion ratio R from 3 to 7 caused a more than 2.5 times increase in tool wear. In turn, the implementation of the extrusion process with the use of R = 11 caused a 4.5-fold increase in the average depth of die wear compared to its wear using the extrusion ratio R = 3.

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Effect of extrusion ratio on the microstructure and texture evolution of AZ31 magnesium alloy by the staggered extrusion (SE)

Cited by 31 publications

References 27 publications

Grain Refinement, Texture Evolution, and Tensile Performance Improvement of AZ91D Magnesium Alloy Processed by Multi‐Cycle Accumulative Back Extrusion

Grain Refinement, Texture Evolution, and Tensile Performance Improvement of AZ91D Magnesium Alloy Processed by Multi‐Cycle Accumulative Back Extrusion

An Analysis for Magnesium Alloy Curvature Products Formed by Staggered Extrusion (SE) Based on the Upper Bound Method

The Effect of the Extrusion Ratio on Load and Die Wear in the Extrusion Process

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