Achieving Microstructural Refinement in Magnesium Alloys through Severe Plastic Deformation

Figueiredo, Roberto B.; Langdon, Terence G.

doi:10.2320/matertrans.md200818

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…Thus, a multi‐modal grain size distribution is visible after 1/8 turn with a significant area of coarse grains but the area fraction of refined grains increases at 1/2 rotation and the structure at 10 turns contains a small number of grains larger than ≈1 μm but almost all of the material is then composed of ultrafine grains. This mechanism of grain refinement is similar to the general model of grain refinement proposed for the processing of magnesium by ECAP …”

Section: Structure Evolutionsupporting

confidence: 62%

“…It is known that magnesium exhibits dynamic recrystallization which leads to the formation of new grains along the original grain boundaries and these occur in a well‐defined necklace pattern . Significant grain refinement is observed during high‐temperature ECAP leading to the possible production of a multi‐modal grain size distribution during processing …”

Section: Structure Evolutionmentioning

confidence: 99%

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Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Figueiredo

Langdon

2018

Adv Eng Mater

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Magnesium and its alloys have attracted significant attention in recent years because they display high strength-to-density ratios, they are biodegradable and they provide a potential for hydrogen storage. Many investigations have examined the effect of high-pressure torsion processing on the microstructures and properties of these materials so that numerous reports are now available. This overview provides a summary of the observations reported to date on the structure and mechanical property evolution including the nature of grain refinement, the grain boundary misorientation distributions, texture evolution, and the minimum grain size. For convenience, the mechanical properties are separated into hardness, tensile behavior, and superplastic properties. It is shown that the mechanism of grain refinement differs from other metallic materials processed by severe plastic deformation but high strength may be achieved in magnesium alloys and exceptional ductility in pure magnesium. Hydrogen storage and corrosion behavior are also examined together with a discussion of recent attempts to produce magnesium-based nanocomposites through processing by high-pressure torsion.

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Section: Structure Evolutionsupporting

confidence: 62%

Section: Structure Evolutionmentioning

confidence: 99%

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Figueiredo

Langdon

2018

Adv Eng Mater

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“…However, many of these light metals are difficult to cold form. In particular, magnesium alloys are known as difficult-to-form materials [7,8]. As a method to improve formability, warm forming has been used.…”

Section: Introductionmentioning

confidence: 99%

Development of Warm Punch Using Friction Heat

Harada,

Takahara

2023

Tribology Online

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In press forming, most forming is performed cold. However, warm or hot forming is used for hard materials. In the present study, we focused on the heat generated by friction between metals and worked on the development of the warm punch that utilizes frictional heat. In the experiments, the heater jig and the rotary jig were prepared as different metals for friction. The test materials were steel materials, such as stainless steel and alloy tool steel. After frictional heating, the surface conditions of the different metals were observed by microscope. The wear depth due to friction was also measured. The temperatures generated by the rotation of the different metals differed in the time of heat generation for the combination of the two metals. In the case of stainless steel with low thermal conductivity, the temperature at the punch tip increased to around 400°C. The wear depth increased slowly with increasing time of wear in the rotary and heater jigs. The proposed method allowed the punch to be heated. The possibility of forming processing resistant material by warm deep drawing was found.

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“…Despite all the advantages, magnesium and its alloys are characterized by low strength and corrosion resistance, and these disadvantages substantially limit their application. Today, much attention is paid to strengthen magnesium and its alloys using the methods based on severe plastic deformation (SPD) [ 4 ]. Magnesium and its alloys are poorly deformable because they have a hexagonal close-packed lattice and only two primary slip systems: (0001)<

> and (

> [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Severe Plastic Deformation and Ultrasonic Treatment on the Structure, Strength, and Corrosion Resistance of Mg-Al-Zn Alloy

et al. 2022

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Nowadays, there is a great demand for increasing the strength and corrosion resistance of magnesium alloys for their wider use in machine engineering, oil industry, and medicine. This paper is devoted to a study on the effects of the combined process of reduction and equal channel angular pressing, as well as the subsequent ultrasonic irradiation on the structure, strength, and corrosion properties of the Mg-Al-Zn alloy. Deformation processing results in an increase of the strength up to 280 ± 10 MPa. A fine-grained structure is formed with a grain size of 10–20 µm and small recrystallized grains 1–2 µm in size. The corrosion resistance in the HCl medium falls down significantly. Action of ultrasound on the deformed specimen leads to an increased fraction of high-angle boundaries, in particular, the fractions of special, fully overlapping Σ13a boundaries and twin boundaries of Σ15b and Σ17a systems. Due to the ultrasonic treatment, the strength of the Mg-Al-Zn alloy increases up to 310 ± 5 MPa, while the corrosion resistance in HCl almost doubles.

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Achieving Microstructural Refinement in Magnesium Alloys through Severe Plastic Deformation

Cited by 8 publications

References 24 publications

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Development of Warm Punch Using Friction Heat

Effects of Severe Plastic Deformation and Ultrasonic Treatment on the Structure, Strength, and Corrosion Resistance of Mg-Al-Zn Alloy

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