Microstructural evolution and mechanical properties of a Mg-Gd-Y alloy processed by impact forging

Shah, S.S.A.; Wu, Di; Wang, W.H.

doi:10.1016/j.msea.2017.07.009

Cited by 42 publications

(14 citation statements)

References 40 publications

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“…A hammer (industrial air pneumatic machine) loaded with 400 kg was used to carry out the MDIF process in the open air as mentioned in detail in Ref. [8]. The strain rate was about 50 s −1 , and small strain per pass of ~ 0.05 was employed during the MDIF process.…”

Section: Methodsmentioning

confidence: 99%

“…2a). About these non-equilibrium phases including cuboid-shaped particles, we have debated in our previous report [3,8]. In brief, these non-equilibrium phases were studied in detail by Gao et al [21] and they confirmed them as Mg24(Gd, Y)5, by transmission electron microscopy (TEM).…”

Section: Initial Microstructurementioning

confidence: 99%

“…In the recent decade, Mg alloys containing Gd and Y specifically (Mg-Gd-Y) have attracted numerous research interests [5,6], since they possess high strength at the room as well as at ambient temperatures and demonstrate good creep resistance [7,8]. To understand their microstructure evolution, several investigations were reported on dynamic recrystallization (DRX) behavior via extrusion [7,9] rolling [10,11], and compression [12] processes.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Effects on the Microstructures of Mg–Gd–Y Alloy Processed by Multi-direction Impact Forging

Shah

Chen

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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A high strain rate multi-directional impact forging (MDIF) was applied to a solutionized Mg-Gd-Y-Zr alloy in the temperature range of 350-500 °C. Results demonstrate that the dominant deformation mode is twinning at a temperature below 400 °C, whereas at a medium temperature of 450 °C considerable continuous dynamic recrystallization was promoted by {10-12} extension twins. At a higher temperature of 500 °C, twinning activation was suppressed. New DRX grains were observed but their sizes were much bigger than those resulting from the MDIFed 50 passes at 450 °C, which are ascribed to the larger grain boundary mobility and atomic diffusion at 500 °C. Moreover, a non-basal weak texture was gained afterward MDIF at each temperature, which is credited to the MDIF process and the minor strain applied in each pass.

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Section: Methodsmentioning

confidence: 99%

Section: Initial Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature Effects on the Microstructures of Mg–Gd–Y Alloy Processed by Multi-direction Impact Forging

Shah

Chen

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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“…In recent years, significant efforts have been made to overcome the shortcomings of magnesium alloys, such as low strength and low ductility, which limit their application in engineering practice [ 1 , 2 , 3 ]. Various reports have revealed that Mg alloys generally exhibit an excellent strengthening response to plastic deformation due to dynamic recrystallization (DRX)-induced grain refinement [ 4 , 5 ], twinning-induced [ 6 ], or micro-shear band-induced [ 7 ] grain breakage and division. The cold deformation below the DRX temperature has been proven to effectively adjust the microstructure and texture to obtain the desired mechanical properties [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism, Microstructure, and Mechanical Properties Evolution of Mg–Gd–Y–Zr Alloy during Cold Torsion

Xiao

Yang

et al. 2021

Materials

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Mg–Gd–Y–Zr alloy was subjected to torsion of various strain levels at room temperature. Obvious traces of basal slip were observed in the twisted alloy. Dislocations of <c+a> were also observed, but there were no signs of significant sliding. Even in the sample whose equivalent strain became 0.294, 101¯0 twinning and 101¯2 twinning were rarely seen. The deformation mode with predominant basal <a> dislocations and subordinate <c+a> dislocations resulted in a modified Y fiber texture with a basal pole slightly dispersed at about 70° from the twist axis. Mechanical tests revealed that the tensile strength and compressive strengths increased simultaneously after twisting.

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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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Microstructural evolution and mechanical properties of a Mg-Gd-Y alloy processed by impact forging

Cited by 42 publications

References 40 publications

Temperature Effects on the Microstructures of Mg–Gd–Y Alloy Processed by Multi-direction Impact Forging

Temperature Effects on the Microstructures of Mg–Gd–Y Alloy Processed by Multi-direction Impact Forging

Deformation Mechanism, Microstructure, and Mechanical Properties Evolution of Mg–Gd–Y–Zr Alloy during Cold Torsion

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

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