Hot deformation and dynamic recrystallization behaviors of Mg–Gd–Y–Zr alloy

Xiao, Haifang; Jiang, Shunong; Tang, Bei; Hao, Wenbin; Gao, Yonghao; Chen, Z.Y.; Liu, C.M.

doi:10.1016/j.msea.2015.01.041

Cited by 67 publications

(18 citation statements)

References 20 publications

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“…Fig. 10b indicates the formation of subgrains with low-angle grain boundaries in the DRX grains through dislocations piling up, as indicated by a white arrow, which might be attributed to the climb or cross-slip of dislocation [25,34]. The dislocation cells were formed at initial grain boundaries and the vicinity of the second phases were shown in Fig.…”

Section: Interpretation Of the Processing Mapmentioning

confidence: 95%

Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy

Cheng

You

et al. 2015

Materials & Design

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Section: Interpretation Of the Processing Mapmentioning

confidence: 95%

Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy

Cheng

You

et al. 2015

Materials & Design

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“…Since the values of n and Q are estimated to be 7.3 and 241 kJ/mol, respectively, cross-slip of screw dislocations is likely to be the rate controlling process due to the much higher apparent activation energy than that for self-diffusion (135 kJ/mol) [19,43,61].…”

Section:  mentioning

confidence: 99%

“…There is a persistent effort to enhance the high temperature performance of magnesium alloys where one of scenarios being explored is the addition of rareearth metals [17,18]. It has been recognized that alloying with rare earth elements bring beneficial effects in terms of strengthening, workability and creep resistance [9,14,18,19]. In recent years, Mg-Zn-Y series alloys have shown great prospect due to their superior mechanical properties at room temperature [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases

et al. 2015

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“…CDRX has also been reported to be the main DRX mechanism in a cast Mg-8Gd-3Y-0.4Zr alloy during hot compression at 673 K. [35] TEM studies on the evolution of DRX in a cast Mg-8.3Gd-2.6Y-0.4Zr alloy have revealed that at high deformation temperatures of 723 K to 773 K the dynamic recrystallization mechanism is controlled by CDRX because of the activation of non-basal slip and cross slip of dislocations. [58] Figure 12 shows the IPF map taken from the deformation area of the GW63-1Ag alloy after hot deformation under the working parameters of T = 673 K and _ c ¼ 1.3 9 10 À1 s À1 . It is obvious that equiaxed grains are distributed uniformly in the deformation area in this hot working condition.…”

Section: Processing Maps and Microstructural Evolutionsmentioning

confidence: 99%

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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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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Hot deformation and dynamic recrystallization behaviors of Mg–Gd–Y–Zr alloy

Cited by 67 publications

References 20 publications

Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy

Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy

Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases

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

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