Microstructural evolution and superplasticity in an Mg–Gd–Y–Zr alloy after processing by different SPD techniques

Alizadeh, Reza; Mahmudi, R.; Pereira, Pedro Henrique R.; Huang, Yi; Langdon, Terence G.

doi:10.1016/j.msea.2016.11.080

Cited by 56 publications

(18 citation statements)

References 49 publications

(65 reference statements)

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“…High temperature shear punch testing was used to evaluate the deformation mechanism in Mg–9% Gd–4% Y–0.4% Zr (GW94) and Mg–5% Gd–4% Y–0.4% Zr alloys processed by HPT. The results showed a peak strain rate sensitivity of ≈0.5 at 623 K and an activation energy in the range of ≈100–110 kJ · mol −1 which is consistent with grain boundary sliding as the rate‐controlling mechanism.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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: Mechanical Propertiesmentioning

confidence: 99%

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

Figueiredo

Langdon

2018

Adv Eng Mater

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“…Recently, new types of Mg-Gd-Y-Zr alloys have attracted great attention owing to their excellent elevatedtemperature mechanical properties and creep resistance [1][2][3][4][5]. Furthermore, they can be significantly strengthened by heat treatments such as solid solution hardening and precipitation hardening [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of temperature-induced wear transition of an Mg-10Gd-1.4Y-0.4Zr alloy under non-lubricated sliding conditions

Wang

Sun

Liu

et al. 2020

Mater. Res. Express

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The friction and wear behavior of an Mg-10Gd-1.4Y-0.4Zr alloy were investigated in detail within a temperature range of 20°C-200°C in order to clarify temperature-induced mild-severe (M-S) wear transition mechanism and verify if contact surface dynamic recrystallization (DRX) temperature criterion can be applicable to elevated temperature M-S wear transition. Coefficient of friction (COF) and wear rate (WR) were plotted against applied load at each test temperature, from which M-S wear transition loads were identified. A wear mechanism transition map was created on test temperatureapplied load coordinate system, in which the mild wear region i.e. a safe working region in engineering application was indicated. The M-S wear transition mechanism was proved to be DRX softening by microstructural examination and hardness measurement in subsurfaces. The effects of precipitation and static recrystallization (SRX) occurred at temperatures of 150°C-200°C on M-S wear transition were also assessed. According to surface DRX temperature criterion, the transition loads were calculated at temperatures of 20°C-200°C, and the results identified applicability of the criterion to wear tests at elevated temperatures.

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“…However, the long time high temperature deformation condition usually causes the die to failure, which increases the energy consumption and the processing cost. To improve the superplasticity and study the superplastic deformation behavior of the material at low temperature and high strain rate have attracted much attention recently . Grain boundary sliding (GBS) is often acknowledged as the important surperplastic deformation mechanism, and it is attributed to the diffusional creep and intergranular slip.…”

Section: Introductionmentioning

confidence: 99%

Superplastic Deformation Behavior of Multi‐Pass Warm Rolled Ti–6Al–4V Titanium Alloy at Low Temperature and High Strain Rate

2018

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The superplastic deformation behavior of Ti-6Al-4V alloy is investigated by the tensile tests for multi-pass warm rolled Ti-6Al-4V alloy at temperature of 700-870 C and strain rate of 10 À3 -10 À2 s À1 . A maximum elongation of 1550% is obtained at temperature of 800 C and strain rate of 10 À3 s À1 . Even at the low temperature of 700 C and the high strain rate of 10 À2 s À1 , the elongation is still 356%. The enhanced superplasticity at low temperature and high strain rate is due to the refined microstructure with fragmented and uniformly distributed fine β grains and to the high density dislocation around grain boundaries as well as dynamic recrystallization. The activation energy at temperature of 800 and 870 C is 226.8 and 220.2 kJ mol À1 , but it increases to 377.5 kJ mol À1 at temperature of 700 C. The average activation energy is 274.8 kJ mol À1 suggesting that the predominant deformation mechanism is grain boundary sliding. The coefficient of strain rate sensitivity increases with the temperature.

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Microstructural evolution and superplasticity in an Mg–Gd–Y–Zr alloy after processing by different SPD techniques

Cited by 56 publications

References 49 publications

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

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

Investigation of temperature-induced wear transition of an Mg-10Gd-1.4Y-0.4Zr alloy under non-lubricated sliding conditions

Superplastic Deformation Behavior of Multi‐Pass Warm Rolled Ti–6Al–4V Titanium Alloy at Low Temperature and High Strain Rate

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