Hot deformation behavior and processing map of coarse-grained Mg–Gd–Y–Nd–Zr alloy

Xia, Xiangsheng; Chen, Qiang; Zhang, Kui; Zhao, Zhongxing; Ma, Minglong; Li, Xinggang; Li, Yongjun

doi:10.1016/j.msea.2013.08.066

Cited by 83 publications

(32 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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].…”

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].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The hot deformation behavior and workability of the as-rolled Ti55 alloy were studied and the optimized hot deformation parameters Although the stacking fault energy of the as-rolled Ti-55 alloy was relatively higher, the softening mechanism of the three steady deformation domains should be DRX because of the relatively higher dissipation efficiency of 48-64% [32]. Besides this, the occurrence of phase transformation also increased the efficiency of power dissipation [33].…”

Section: Discussionmentioning

confidence: 99%

“…Hence, the flow instability region of the as-rolled Ti55 alloy was located in the temperature range of 700-825 °C and strain rate range of 0.1-1 s −1 , and thus the processing map of as-rolled Ti55 alloy derived from Murty's criterion was only discussed in the following section, which was thought to have a wider application range for the type of flow stress versus strain rate curves [29,31]. Although the stacking fault energy of the as-rolled Ti55 alloy was relatively higher, the softening mechanism of the three steady deformation domains should be DRX because of the relatively higher dissipation efficiency of 48-64% [32]. Besides this, the occurrence of phase transformation also increased the efficiency of power dissipation [33].…”

Section: Instability Regionmentioning

confidence: 99%

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

Wang

Jin

et al. 2017

Metals

View full text Add to dashboard Cite

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.

show abstract

“…This is because that magnesium alloy has poor plasticity and is mostly shaped by extruding at high temperature [1]. During extrusion deformation, the deformation body is subjected to three-dimensional compressive stress in the extrusion container, which is conductive to giving full play to the plasticity.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Large-section Profile Die for AZ80 Alloy

Ma¹,

Wang²,

Zhang³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

Self Cite

View full text Add to dashboard Cite

Abstract. This paper regards a kind of AZ80 magnesium alloy extrusion die as the research object to design its shape and make the systematic optimization. The results show that after optimization, the simulated extruding warpage reduced with stable dimension. By comparing the loads of dummy blocks under different die designs, the loads are close when the profile is extruded to the stable stage. After adding the diversion trench, the alloy is easier to become the desired shape through the secondary deformation.

show abstract

Hot deformation behavior and processing map of coarse-grained Mg–Gd–Y–Nd–Zr alloy

Cited by 83 publications

References 33 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

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

Design and Optimization of Large-section Profile Die for AZ80 Alloy

Contact Info

Product

Resources

About