Characterization of hot deformation behavior of as-extruded Mg–Gd–Y–Zn–Zr alloy

Xia, Xiangsheng; Chen, Qiang; Li, Jianping; Shu, Dayu; Hu, Chuankai; Huang, Shuhai; Zhao, Zhongxing

doi:10.1016/j.jallcom.2014.04.210

Cited by 75 publications

(17 citation statements)

References 29 publications

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“…Accordingly, the orientation maps of the grains after SPT at 450 °C were obtained by EBSD and the results are shown in In comparing with earlier studies of Mg-Gd-Y alloys, it is noted that the present results are consistent with those reported for other similar alloys [16][17][18][19][20]. For example, it was reported that grain growth occurs at 500 °C in an extruded Mg-8.90Gd-5.11Y-3.10Zn-0.47Zr alloy but fine DRX grains form at 400 °C [19]. Also, the temperature range of 375-450 °C was suggested earlier as the appropriate temperature range for DRX of an as-cast and homogenized Mg-9.3Gd-2.9Y-0.3Zr alloy [17].…”

Section: Microstructural and Textural Evolution After Sptsupporting

confidence: 90%

“…Generally, discontinuous dynamic recrystallization (DDRX) has been invoked as the most important microstructural restoration process in Mg-Gd-Y alloys at elevated temperatures and a summary of the experimental conditions used in these reports is given in Table1 where all data relate to hot compression [16][17][18][19][20]. The processing condition, the resultant grain size where reported, the testing temperature and the strain rate ranges are all listed in Table1 and inspection shows that most reports relate to alloys in the cast condition and there is only one investigation of an Mg-Gd-Y alloy in the extruded condition [19]. Furthermore, there have been no investigations using other deformation procedures such as shear testing.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy

et al. 2017

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Abstract:Mg-Gd-Y-Zr alloys are among recently developed Mg alloys having superior mechanical properties at elevated temperatures. Dynamic recrystallization (DRX) and rare earth (RE)-rich particles play important roles in enhancing the high temperature strength of these alloys. Accordingly, the microstructural evolution of a fine grained extruded Mg-5Gd-4Y-0.4Zr alloy was investigated after hot shear deformation in the temperature range of 350-450 °C using the shear punch testing (SPT) method. The results reveal the occurrence of partial dynamic recrystallization at the grain boundaries at 350 °C while the fraction of DRX grains increases with increasing deformation temperature. A fully-recrystallized microstructure was achieved after SPT at 450 °C. The Gd-rich and Y-rich cuboid particles, having typical sizes in the range of ~50 nm to ~3 m, show excellent stability and compatibility after hot shear deformation and these particles enhance the high temperature strength during hot deformation at elevated temperatures. The textural evolution, examined using electron backscattered diffraction (EBSD), revealed a non-fibrous basal DRX texture after SPT which is different from the conventional deformation texture.

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Section: Microstructural and Textural Evolution After Sptsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy

et al. 2017

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“…The variation trend of flow stress is that the flow stress firstly increases sharply to a maximum value and then decreases gradually to a steady state as the strain increases. This flow behavior is a work hardening accompanied by dynamic recrystallization softening behavior [4]. At the initial stage of strain, hardening rate is higher than the softening rate, thus the flow stress rises sharply; After it attains the peak stress, all stress-strain curves are almost in flat shape, this is because a balance is established between work hardening and softening.…”

Section: Flow Stress Behaviormentioning

confidence: 98%

Hot Compression Deformation Behavior of Mg-Gd-Nd-Zr Heat-Resistant Magnesium Alloy

Xin

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The hot compression deformation of Mg-12Gd-2.5Nd-0.5Zr heat-resistant magnesium alloy was carried out on Gleeble-1500D thermo-mechanical simulator with the strain rate range of 0.002-1 s -1 , the deformation temperature range of 623-773 K and maximum strain of 50 %. The results show that true stress decreases with the increase of deformation temperature at a constant strain rate, and the true stress increases with the increase of strain rate at a same temperature. The deformation constitutive equation was established, and the hot deformation activation energy of 292.679 kJ/mol is determined.

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“…The processing map has been established recently by Prasad et al [24][25][26][27][28] on the basis of the dynamic material model, aiming at studying the microstructure evolution and avoiding flow instability of many materials. In the dynamic materials model (DMM), the workpiece subjected to hot working is considered as a nonlinear dissipator of power.…”

Section: Processing Map Theorymentioning

confidence: 99%

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wang

Jin

et al. 2017

Metals

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Abstract:The isothermal compression experiment of as-rolled Ti-55 alloy was carried out on a Gleeble-3800 thermal simulation test machine at the deformation temperature range of 700-1050 • C and strain rate range of 0.001-1 s −1 . The hot deformation behavior and the microstructure evolution were analyzed during thermal compression. The results show that the apparent activation energy Q in α + β dual-phase region and β single-phase region were calculated to be 453.00 KJ/mol and 279.88 KJ/mol, respectively. The deformation softening mechanism was mainly controlled by dynamic recrystallization of α phase and dynamic recovery of β phase. Discontinuous yielding behavior mainly occurred in β phase region, which weakened gradually with the increase of deformation temperature (>990 • C) and strain rate (0.01-1 s −1 ) in β phase region. The processing map derived from Murty's criterion was more accurate in predicting the hot workability than that derived from Prasad's criterion. The optimized hot working window was 850-975 • C/0.001-1 s −1 , in which sufficient dynamic recrystallization occurred and α + β-transus microstructure was obtained. When deformed at higher temperature (≥1000 • C), coarsened lath-shape β-transus microstructure was formed, while deformed at lower temperature (≤825 • C) and higher strain rate (≥0.1 s −1 ), the dynamic recrystallization was not sufficient, thus flow instability appeared because of shear cracking.

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Characterization of hot deformation behavior of as-extruded Mg–Gd–Y–Zn–Zr alloy

Cited by 75 publications

References 29 publications

Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy

Microstructural evolution during hot shear deformation of an extruded fine-grained Mg–Gd–Y–Zr alloy

Hot Compression Deformation Behavior of Mg-Gd-Nd-Zr Heat-Resistant Magnesium Alloy

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

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