Difference in extrusion temperature dependences of microstructure and mechanical properties between extruded AZ61 and AZ91 alloys

Lee, Dong Hee; Lee, Gyo Myeong; Park, Sung Hyuk

doi:10.1016/j.jma.2022.05.015

Cited by 27 publications

(6 citation statements)

References 70 publications

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“…[30] 8.5-9.5 0.45-0.9 0.17-0.4 --Heat treatment was carried out in an air radiation furnace. The following heat treatments were chosen according to the literature: 400 • C, 12 h for AZ31 [9,10], and 415 • C, 24 h for AZ91 [11][12][13]. After heat treatment, the samples were rapidly cooled in water.…”

Section: Methodsmentioning

confidence: 99%

“…Their amount is reduced as a result of the lower Al content in the alloy, and their characteristic is usually fine and easier to dissolve. In the case of the AZ91 alloy, elevated temperatures (415 • C) and longer holding times (24 h) are recommended to dissolve the secondary phase [11][12][13]. The fully developed dendritic structure of the AZ91 alloy transforms into a globular structure after heat treatment [13].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the AZ91 alloy, elevated temperatures (415 • C) and longer holding times (24 h) are recommended to dissolve the secondary phase [11][12][13]. The fully developed dendritic structure of the AZ91 alloy transforms into a globular structure after heat treatment [13]. It might be of interest to investigate whether the grain refinement effect is still visible after heat treatment in an AZ91 alloy compared to AZ31, though longer holding times and higher temperatures are recommended for the heat treatment to dissolve the higher amount of Mg 17 Al 12 precipitations.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Aluminum Content on the Microstructure, Mechanical Properties, and Hot Deformation Behavior of Mg-Al-Zn Alloys

Moses,

Ullmann,

Prahl

2023

Metals

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This study compares AZ91 with AZ31 to investigate the influence of a higher Al content on the resulting microstructure, mechanical properties, and hot deformation behavior. While AZ31 exhibits a globular structure after casting, AZ91 shows a fully developed dendritic structure due to the promotion of dendrites. A heat treatment helped to homogenize AZ31, dissolved a large part of the Mg-Al precipitations in AZ91, and formed globular grains in AZ91. Due to the impact of Al on constitutional supercooling, AZ91 exhibits smaller grains than AZ31. Because of the strengthening of the solid solution, AZ91 also exhibits higher strength and hardness compared to AZ31. Cylindric compression tests of the heat-treated samples were conducted at different temperatures (300–400 °C) and strain rates (0.1 × 10 s−1). The main dynamic recrystallization (DRX) mechanisms in AZ31 and AZ91 are twinning-induced DRX and discontinuous DRX. It was detected that Mg17Al12 precipitates at the grain boundaries in AZ91, which influences the grain size through pinning. Similar results could be conducted in rolling trials. Although both alloys have similar grain sizes after rolling, AZ91 exhibits higher strengths, while AZ31 shows higher ductility. This can be explained by the solid solution strengthening in AZ91 and less brittle Mg17Al12 precipitations in AZ31.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Aluminum Content on the Microstructure, Mechanical Properties, and Hot Deformation Behavior of Mg-Al-Zn Alloys

Moses,

Ullmann,

Prahl

2023

Metals

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“…The current simulation follows the same approach for assigning boundary conditions for flow velocities around the tool and for solving for flow stress, viscosity, strain rate, and temperature as the authors' prior simulation. Material inputs for the simulation, i.e., Sheppard-Wright parameters, Zener-Hollomon parameters, heat capacity (as a function of temperature), thermal conductivity (as a function of temperature), solidus temperature, coefficient of friction, etc., were taken from [22,[53][54][55][56][57][58].…”

Section: Temperature Distribution Modelmentioning

confidence: 99%

“…Numerous alloys are formed based on a Mg matrix, and the most frequently tested magnesium alloys include AZ31, ZE41, AZ61, AM60, AZ61, AZ80, and AZ91 [9][10][11][12][13][14][15][16][17]. The most common methods used to produce elements from Mg alloys are cast, die-cast [18], cast-rolling [19], rolling [20], squeeze cast [21], and extrusion [10,22,23]. Brittleness is the main problem in the processing and use of Mg and its alloys.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

et al. 2023

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For the friction stir welding (FSW) of AZ91 magnesium alloy, low tool rotational speeds and increased tool linear speeds (ratio 3.2) along with a larger diameter shoulder and pin are utilized. The research focused on the influence of welding forces and the characterization of the welds by light microscopy, scanning electron microscopy with an electron backscatter diffraction system (SEM-EBSD), hardness distribution across the joint cross-section, joint tensile strength, and SEM examination of fractured specimens after tensile tests. The micromechanical static tensile tests performed are unique and reveal the material strength distribution within the joint. A numerical model of the temperature distribution and material flow during joining is also presented. The work demonstrates that a good-quality joint can be obtained. A fine microstructure is formed at the weld face, containing larger precipitates of the intermetallic phase, while the weld nugget comprises larger grains. The numerical simulation correlates well with experimental measurements. On the advancing side, the hardness (approx. 60 HV0.1) and strength (approx. 150 MPa) of the weld are lower, which is also related to the lower plasticity of this region of the joint. The strength (approx. 300 MPa) in some micro-areas is significantly higher than that of the overall joint (204 MPa). This is primarily attributable to the macroscopic sample also containing material in the as-cast state, i.e., unwrought. The microprobe therefore includes less potential crack nucleation mechanisms, such as microsegregations and microshrinkage.

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Enhanced Strength-Ductility Synergy in Mg-0.5 wt%Ce Alloy by hot Extrusion

Liu

et al. 2022

Met. Mater. Int.

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Difference in extrusion temperature dependences of microstructure and mechanical properties between extruded AZ61 and AZ91 alloys

Cited by 27 publications

References 70 publications

Influence of Aluminum Content on the Microstructure, Mechanical Properties, and Hot Deformation Behavior of Mg-Al-Zn Alloys

Influence of Aluminum Content on the Microstructure, Mechanical Properties, and Hot Deformation Behavior of Mg-Al-Zn Alloys

Comprehensive Research of FSW Joints of AZ91 Magnesium Alloy

Enhanced Strength-Ductility Synergy in Mg-0.5 wt%Ce Alloy by hot Extrusion

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