Microstructural development under interrupted hot deformation and the mechanical properties of a cast Mg–Gd–Y–Zr alloy

Xiao, Zhenyu; Yang, Xuyue; Yang, Yi; Zhang, Zhirou; Zhang, Duxiu; Li, Yang; Sakai, Taku

doi:10.1016/j.msea.2015.11.034

Cited by 16 publications

(5 citation statements)

References 19 publications

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“…forging [15]. The samples tested were cut to plates with 2 to 3 mm thickness parallel to the compression axis, and then annealed for a period of time between 10 2 s and 10 5 s at 693 K in air using a resistance furnace.…”

Section: Methodsmentioning

confidence: 99%

“…For conventional forging, NFGs normally initiate along the original grain boundaries [10][11][12][13]. In contrast, the interrupted forging introduces an intermediate annealing and therefore enable the new NFGs further developed not only at original grain boundaries, but also the interfaces between coarsen NFGs and original grain interiors as well as deformation bands introduced during subsequent forging under interrupted conditions [15]. Those additional NFG formation sites give a significant increase in the V NFG (Fig.…”

Section: Nfg Development During Deformationmentioning

confidence: 99%

“…However, the formation of NFGs become much harder with the addition of RE elements in Mg alloys [14], especially in cast Mg-RE alloys having coarse initial grains where NFGs are hardly developed in a whole volume even at high strains. Recently, Xiao et al [15] carried out an interrupted hot forging with an intermediate annealing method by using a cast Mg-9Gd-4Y-0.5Zr alloy and succeeded in developing a volume fraction of NFGs around 0.8, leading to an increase of ambient tensile elongation. As a result, a similar approach with modified processing parameter is applied in this study aiming at obtaining a microstructure with almost fully developed NFGs with a volume fraction of NFGs above 0.85.…”

Section: Introductionmentioning

confidence: 99%

“…The present work aimed to investigate the annealing characteristics of a cast Mg-9Gd-4Y-0.5Zr alloy processed by continuous and interrupted forging with an intermediate annealing [15]. The aforementioned forging methods could result in development of various mixed grain structures composed of necklace NFGs and retained coarse grains.…”

Section: Introductionmentioning

confidence: 99%

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Annealing behavior of a cast Mg-Gd-Y-Zr alloy with necklace fine grains developed under hot deformation

Yang

Xiao

et al. 2017

Materials Science and Engineering: A

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The microstructure and texture development of a cast Mg-Gd-Y-Zr alloy during hot deformation and subsequent annealing were investigated by optical microscopy (OM) and electron backscattered diffraction (EBSD) technology. Initial microstructures with partially and fully developed new fine grains (NFGs), separately attended by continuous or interrupted hot forging, were various mixed grain structures composed of NFGs in necklace and retained coarse grains. It is shown that, during annealing, the development of grain size can be divided into three stages: i.e. an incubation of grain growth, a rapid coarsening and a normal grain growth. After a long time annealing of over 10 4 ks at 693 K, the average grain size for samples continuous compressed toε= 1.2 and those interrupted compressed toε= 1.6 were close. Moreover, orientations of such strain-induced fine grains were relatively randomly distributed, leading to a weakened basal texture, while the basal plane of retained coarse grains were perpendicular to the forging direction. Such texture even became weaker during subsequent annealing. The results show that the development of necklace NFGs during hot deformation can be effective for homogeneous grain refinement under subsequent annealing.

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Section: Methodsmentioning

confidence: 99%

Section: Nfg Development During Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Annealing behavior of a cast Mg-Gd-Y-Zr alloy with necklace fine grains developed under hot deformation

Yang

Xiao

et al. 2017

Materials Science and Engineering: A

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“…4 (d)), equiaxed UFGs are almost fully developed in a whole volume. It is well known[10,21,22,23,24] that DBs are frequently formed in the Mg alloys during high temperature compression owing to its intrinsic anisotropic…”

mentioning

confidence: 99%

Effect of heat treatment on dynamic recrystallization behaviors and mechanical properties of Mg–2.7Nd–0.5Zn–0.8Zr alloy

Zhang

Yang

Fang

et al. 2016

Materials Science and Engineering: A

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The fine-grained structure development and the resultant mechanical properties during/after hot deformation were investigated in a Mg-2.7Nd-0.5Zn-0.8Zr alloy pretreated in solution and subsequently full aging. The true stress-true strain flow curves show a two-step work hardening during hot compression due to the interactions between dislocations and Mg-Nd precipitates as well as Zn-Zr intermetallics. In as-aging (AA) sample containing statically precipitated particles (SPPs), deformation bands (DBs) are easily developed at low strains and then ultrafine grains (UFGs) are evolved at along the boundaries of DBs and original grains at medium strains and rapidly approaches to a full development of final stable UFGs as the strain goes higher. In as-solution (AS) sample, by contrast, equiaxial UFGs are partially developed even in high strain and the grain sizes are smaller attributed to dynamic precipitated particles (DPPs). Tensile tests were carried out at ambient temperature for both types of sample, the results show that the tensile elongation to fracture of the hot deformed AA sample is higher than that of the AS one, because the former has a higher volume fraction and a weaker texture of UFGs developed. Besides, the AA sample contains a higher 5 % proof strength compared

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Influence of pre-straining on creep behaviors of Mg–2Y alloy sheets

Xiao

Huo

Zhang

et al. 2019

Journal of Alloys and Compounds

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Microstructural development under interrupted hot deformation and the mechanical properties of a cast Mg–Gd–Y–Zr alloy

Cited by 16 publications

References 19 publications

Annealing behavior of a cast Mg-Gd-Y-Zr alloy with necklace fine grains developed under hot deformation

Annealing behavior of a cast Mg-Gd-Y-Zr alloy with necklace fine grains developed under hot deformation

Effect of heat treatment on dynamic recrystallization behaviors and mechanical properties of Mg–2.7Nd–0.5Zn–0.8Zr alloy

Influence of pre-straining on creep behaviors of Mg–2Y alloy sheets

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