Dynamic precipitation in a Mg–Gd–Y–Zr alloy during hot compression

Xiao, Haifang; Tang, Bei; Liu, Chuming; Gao, Yonghao; Yu, Sen; Jiang, Shunong

doi:10.1016/j.msea.2015.08.022

Cited by 95 publications

(18 citation statements)

References 19 publications

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“…These precipitates could improve the strength through the precipitation strengthening effect; however, they reduced ductility because microcracks may have been initiated at the interface between these phases and the α‐Mg matrix. [ 32 ] Therefore, the fraction strain of the alloy increased gradually.…”

Section: Resultsmentioning

confidence: 99%

Effect of Pre‐Extrusion on the Microstructure and Properties of Forged Mg−Al−Zn−Ce Alloy

Wang

Yan

et al. 2021

Adv Eng Mater

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The effects of different morphologies of initial grains obtained by pre‐extrusion under different extrusion hole diameters or different extrusion temperatures on the microstructure and mechanical properties of forged Mg−Al−Zn−Ce alloy are studied. After homogenization treatment of as‐cast Mg−Al−Zn−Ce alloy, β‐Mg17Al12 phase is completely dissolved into the α‐Mg matrix. Then, pre‐extrusion deformation is conducted. Dynamic recrystallization (DRX) occurs during the pre‐extrusion process, and the initial grains with different grain sizes, second‐phase volume fractions, and textures are obtained. The pre‐extruded alloys show a strong basal plane (0001) texture and a monotonous increasing (or decreasing) change. After forging the pre‐extruded alloys, compared with the homogeneous forged alloy, the average grain size of the pre‐extruded‐forged (PEF) alloys is smaller and the texture strength is greatly weakened. As the microstructure of the pre‐extruded alloys, the PEF alloys show a monotonous increase (or decrease) in grain size, the volume fraction of the second phase, and texture strength. It is inferred that the microstructure and texture of PEF alloys evolve based on the microstructure and texture of the pre‐extruded alloys, and their mechanical properties are determined by the evolved microstructure and texture.

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Section: Resultsmentioning

confidence: 99%

Effect of Pre‐Extrusion on the Microstructure and Properties of Forged Mg−Al−Zn−Ce Alloy

Wang

Yan

et al. 2021

Adv Eng Mater

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“…The average size of the precipitation is ~40 nm. The nano-scale precipitation results from the dynamic precipitation of the supersaturated GWQ1032K alloy during hot rolling [ 26 , 38 ]. The segregation of RE at grain boundary is mainly attributed to the following two factors: firstly, defects such as dislocation tend to accumulate at the grain boundary in deformed samples [ 31 , 39 ]; secondly, the grain boundary shows a more severe lattice mismatch and higher stored energy than the interior [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

“…Zhou et al [ 23 ] and Reza Alizadeh et al [ 24 ] reported that mechanical properties of Mg-Gd alloys can be enhanced by SPD for grain refinement. Moreover, Xiao et al [ 25 ] and Hou et al [ 26 ] found that more notable precipitation hardening at T6 (the complete artificial aging after solution) than T5 (the incomplete artificial aging after solution) after hot deformation in Mg-Gd alloys. They also proposed that the density of precipitation was reduced by the dynamic precipitation during hot deformation.…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement and Aging Hardening of the Mg-10Gd-3Y-2Ag-0.4Zr Alloy Produced by a Two-Step Forming Process

Ning

Gao

et al. 2018

Materials

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Grain refinement and precipitation are two effective ways to improve the mechanical properties of Mg-RE alloys. In this work, a two-step forming process is proposed. This includes cold rolling and subsequent annealing at high temperature for a short duration. By the two-step forming process, grains can be refined from 100 μm to 20 μm in compare with ~30 μm by common hot rolling at 450 °C for a reduction of 80%. The sample shows more distinct aging hardening, as the hardness amplification of 60 HV is twice that of the hot-rolled sample. The precipitation is observed by high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). Dynamic precipitation in the sample by the two-step route is found to be effectively suppressed. Interestingly, after subsequent annealing, the density of precipitation, especially β′, become much higher than that in hot-rolled samples.

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“…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]. Small dispersed second phase particles are produced during dynamic precipitation and have significant effects on the DRX process and alloy properties.…”

Section: Introductionmentioning

confidence: 99%

“…However, the dynamic precipitation was not studied further. Xiao [19] has studied the dynamic precipitation behavior of Mg–Gd–Y–Zr alloys during hot deformation, and the results showed that the dynamic precipitation of β -Mg 5 (Gd,Y) was sensitive to the deformation temperature. Dynamic precipitation occurred in the temperature range of 300~400 °C during hot compression, but did not occur when the deformation temperature exceeded 450 °C.…”

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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Dynamic precipitation in a Mg–Gd–Y–Zr alloy during hot compression

Cited by 95 publications

References 19 publications

Effect of Pre‐Extrusion on the Microstructure and Properties of Forged Mg−Al−Zn−Ce Alloy

Effect of Pre‐Extrusion on the Microstructure and Properties of Forged Mg−Al−Zn−Ce Alloy

Grain Refinement and Aging Hardening of the Mg-10Gd-3Y-2Ag-0.4Zr Alloy Produced by a Two-Step Forming Process

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

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