The effect of rare earth elements on the behaviour of magnesium-based alloys: Part 1—Hot deformation behaviour

Stanford, Nicole; Callaghan, Mark; Jong, Bob de

doi:10.1016/j.msea.2012.12.023

Cited by 69 publications

(35 citation statements)

References 21 publications

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“…It is concluded, therefore, that the RE elements alter the DRX texture after hot shear deformation where this is similar to results reported earlier for other modes of deformation such as hot extrusion [14] and hot compression [32,33]. This difference is attributed to the segregation of RE elements at the grain boundaries and dislocation cores and also to the slow diffusivity of Gd and Y in Mg where these elements impede the movement of dislocations and grain boundaries through a solute drag effect [14].…”

Section: Textural Evolution After Hot Shear Deformationsupporting

confidence: 88%

“…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]. A microstructural characterization of a hot compressed as-cast binary Mg-1.5Gd alloy at 400 °C also revealed the local occurrence of DRX at the original grain boundaries and the development of necklace-like structures [32]. However, static annealing of these samples at 450 °C for 1 h resulted in fully recrystallized microstructures [33].…”

Section: Microstructural and Textural Evolution After Sptmentioning

confidence: 66%

“…These differences are attributed to the role of the RE elements in delineating the onset temperature of recrystallization, the amount of stored energy [32], and the crystallographic texture of the newly-formed DRX grains [14,33].As an example, while DRX occurs at grain boundaries of an AZ31 alloy at 300 °C, there was no evidence for the presence of recrystallized grains in the microstructure of an Mg-Gd alloy at this temperature [32]. Accordingly, it is concluded that 350 °C is the temperature for the onset of recrystallization in the present Mg-Gd-Y-Zr alloy as observed in Fig.…”

Section: Microstructural and Textural Evolution After Sptmentioning

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: Textural Evolution After Hot Shear Deformationsupporting

confidence: 88%

Section: Microstructural and Textural Evolution After Sptmentioning

confidence: 66%

Section: Microstructural and Textural Evolution After Sptmentioning

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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“…However, as rare earth elements segregate at the grain boundaries, the diffusion of carbon atoms is weakened. e literates also have indicated that the mobility of grain boundaries is limited by the rare earth dragging effect due to the enrichment of rare earth at the grain boundaries [14,15].…”

Section: Flow Stress Curvesmentioning

confidence: 99%

Influence of Rare Earth on Dynamic Recrystallization Behavior of As-Cast 30Mn Steel

Yan

Zhao

2018

Advances in Materials Science and Engineering

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Based on casting-rolling compound forming process, the effect of rare earth on dynamic recrystallization (DRX) of as-cast 30Mn steel was investigated by the single-pass hot compression tests performed using a Gleeble-3500 thermomechanical simulator, and the deformation temperature range was 950°C-1150°C and strain rate range was 0.1-1 s −1. With the assistance of the process parameters, constitutive equations were used to obtain the activation energy and hot working equation.e dynamic recrystallization kinetics models of the tested steel were constructed. e results show that rare earth ferrosilicon alloy addition (0.2%, mass fraction) can delay the onset of DRX significantly and refine the hot deformation microstructures. All of the results indicate that the addition of rare earth into as-cast 30Mn steel is helpful to prepare excellent cast slab for the casting-rolling compound forming technology.

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“…Such retarded grain growth kinetics is believed to arise from solute segregation to grain boundaries and related solute-driven effects [28,29,30]. It has also been suggested that RE solute atoms have a tendency to interact and segregate to dislocations during deformation, which in turn creates a microstructure where weaker recrystallization textures are favoured [31]. On the contrary, recent studies of binary and ternary Mg-Zn-Ca alloys suggest that nucleation of randomly oriented recrystallized grains occurs at boundaries of deformed grains, rather than at shear bands or twin boundaries.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Grain growth kinetics and annealed texture characteristics of Mg-Sc binary alloys

Silva

Kula

Mishra

et al. 2016

Journal of Alloys and Compounds

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The effect of rare earth elements on the behaviour of magnesium-based alloys: Part 1—Hot deformation behaviour

Cited by 69 publications

References 21 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

Influence of Rare Earth on Dynamic Recrystallization Behavior of As-Cast 30Mn Steel

Grain growth kinetics and annealed texture characteristics of Mg-Sc binary alloys

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