Constitutive Analysis and Hot Deformation Behavior of Fine-Grained Mg-Gd-Y-Zr Alloys

Alizadeh, Reza; Mahmudi, R.; Ruano, Oscar Antonio; Ngan, A.H.W.

doi:10.1007/s11661-017-4311-7

Cited by 26 publications

(9 citation statements)

References 32 publications

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“…Smaller grain sizes would provide more density of the grain boundaries that facilitate GBS mechanism. Alizadeh et al [20] have reported similar values of hyperbolic sine exponents for three extruded fine-grained GW94, GW54 and GW50 alloys after hot deformation via SPT in a temperature range of 573 K to 773 K, where grain boundary sliding was considered the main deformation mechanism.…”

Section: ½11mentioning

confidence: 82%

“…[38] For the n value in the range of 2 to 2.5, grain boundary sliding (GBS) has been suggested to be the operating deformation mechanism. [20] Barezban et al [39] obtained a hyperbolic-sine exponent of 3 for a hot extruded binary Mg-1.5Gd alloy after hot compression deformation in the temperature range of 573 K to 723 K and strain rate of 0.0001 s À1 to 0.1 s À1 . They suggested that viscous glide of dislocations was the controlling deformation mechanism due to segregation of solute Gd atoms at dislocations.…”

Section: ½11mentioning

confidence: 99%

“…Nevertheless, there are limited studies on the hot deformation behavior of the wrought Mg-Gd-Y alloys. Recently, Alizadeh et al [20] studied the hot deformation behavior of the extruded fine-grained Mg-xGd-yY alloys via shear punch testing (SPT), incorporating the Garofalo equation in the shear mode, and suggested grain boundary sliding as the main controlling mechanism. Zhou et al [21] examined the hot deformation behavior of an extruded Mg-9.8Gd-2.7Y-0.4Zr alloy by hot compression test.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ag Addition on the Hot Deformation, Constitutive Equations and Processing Maps of a Hot Extruded Mg-Gd-Y Alloy

Rezaei

Mahmudi

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2020

Metall Mater Trans A

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Hot deformation behavior of the extruded Mg-6Gd-3Y (GW63) and Mg-6Gd-3Y-1Ag (GW63-1Ag) alloys was assessed by shear punch testing (SPT) method in the temperature range of 623 K to 723 K and shear strain rate of 1.6 9 10 À2 to 1.3 9 10 À1 s À1. Microstructural examinations showed that Ag addition decreased the initial grain size from 10.1 to 2.9 lm. According to the hot deformation results, hyperbolic-sine exponents (n-values) of 3.39 and 2.54 were obtained for the Ag-free and Ag-containing alloys, respectively. The corresponding activation energies were found to be 321 and 178 kJ mol À1 for these alloys. Therefore, the controlling deformation mechanisms were defined as viscous glide of dislocation for the Mg-6Gd-3Y alloy and grain boundary sliding for Mg-6Gd-3Y-1Ag. Processing maps were developed based on the dynamic material model (DMM) to determine the flow instability domains during hot deformation. Accordingly, the optimum hot working conditions were found to be in the temperature range of 655 K to 723 K and shear strain rate of 3.3 9 10 À2 to 1.3 9 10 À1 s À1 for the GW63-1Ag alloy, whereas the safe deformation window for the GW63 alloy was narrowed down to a temperature range of 665 K to 705 K and shear strain rate of 7.2 9 10 À2 to 1.3 9 10 À1 s À1. The Ag-containing alloy exhibited flow instability regions only at low temperatures and high strain rates. On the other hand, the Ag-free alloy demonstrated other instability domains comprising the formation of mechanical twins and cracking. Electron back-scattered diffraction analysis was utilized to correlate the microstructural evolution of the alloys after shear deformation to the hot working parameters. Continuous dynamic recrystallization was suggested as the main mechanism for generation of the dynamically recrystallized grains during hot deformation of both alloys.

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Section: ½11mentioning

confidence: 82%

Section: ½11mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Ag Addition on the Hot Deformation, Constitutive Equations and Processing Maps of a Hot Extruded Mg-Gd-Y Alloy

Rezaei

Mahmudi

Logé

2020

Metall Mater Trans A

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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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“…These investigations have mainly focused on the strengthening method and its mechanism [4,5,6]. This research has recently been extended to the thermal deformation of Mg–Gd alloys [7,8,9,10]. It is known that the effective deformation modes of magnesium alloys are extrusion, forging, or rolling [11,12,13] and that the ductility and strength can be significantly enhanced due to the fine grains associated with dynamic recrystallization (DRX) [14,15,16,17], texture [10,18], and dynamic precipitation (DP) of rare earth compounds [14,19,20].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Precipitation in Mg–8.08Gd–2.41Sm–0.30Zr Alloy during Hot Compression

Zhu

Zhang

et al. 2018

Materials

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Dynamic precipitation of Mg–8.08Gd–2.41Sm–0.30Zr (wt %) alloy during hot compression was studied in the present work. The effects of temperature and strain rate on dynamic precipitation, and the effects of dynamic precipitation on dynamic recrystallization (DRX) and microhardness, were systematically analyzed. For this purpose, hot compression tests were conducted at the strain rates of 0.002~1 s−1 and temperatures of 350~500 °C, with the compaction strain of 70% (εmax = 0.7). The obtained results revealed that dynamic precipitation occurred during hot compression at 350~400 °C, but did not occur for T ≥ 450 °C. The precipitates were demonstrated to be β-Mg5Gd with a size of 200~400 nm, and they were distributed in the DRXed region. Dynamic precipitation occurred at strain rates in the 0.002~0.01 s−1 range, but did not occur when the strain rates were in the 0.1~1 s−1 range for the hot compression temperature of 350 °C. The relationships between the hot compression temperature (T) and DRXed grain size (lnd), microhardness (Hv), and DRXed grain size (d−1/2) of Mg–8.08Gd–2.41Sm–0.30Zr alloy were obtained.

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Constitutive Analysis and Hot Deformation Behavior of Fine-Grained Mg-Gd-Y-Zr Alloys

Cited by 26 publications

References 32 publications

Effect of Ag Addition on the Hot Deformation, Constitutive Equations and Processing Maps of a Hot Extruded Mg-Gd-Y Alloy

Effect of Ag Addition on the Hot Deformation, Constitutive Equations and Processing Maps of a Hot Extruded Mg-Gd-Y Alloy

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

Dynamic Precipitation in Mg–8.08Gd–2.41Sm–0.30Zr Alloy during Hot Compression

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