Effects of minor Gd addition on microstructures and mechanical properties of the high strain-rate rolled Mg–Zn–Zr alloys

Yu, Haiyang; Yan, Hongge; Chen, Jihua; Su, Bin; Yi, Zheng; Yanjin, Shen; Zhaojie, Ma

doi:10.1016/j.jallcom.2013.10.005

Cited by 87 publications

(25 citation statements)

References 30 publications

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“…Zhang et al [105] also reported that the addition of Er has caused the interactions between dislocations and solute and thereby caused yield point phenomenon. Yu et al [106] investigated Mg-Zn-Zr alloys and reported that with the addition of Gd to the alloys, quasicrystal I-phases (Mg-Zn-Gd ternary phase) are formed along the grain boundaries and increased with increasing the Gd content. In a similar study, Xiao et al [107] reported that the Al2REZn2 phases are formed with increase in RE content.…”

Section: Mg-zn-re Higher Alloy Systemsmentioning

confidence: 99%

Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review

Tekumalla

Seetharaman

Almajid

2014

Metals

178

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Magnesium-rare earth based alloys are increasingly being investigated due to the formation of highly stable strengthening phases, activation of additional deformation modes and improvement in mechanical properties. Several investigations have been done to study the effect of rare earths when they are alloyed to pure magnesium and other Mg alloys. In this review, the mechanical properties of the previously investigated different magnesium-rare earth based binary alloys, ternary alloys and other higher alloys with more than three alloying elements are presented.

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Section: Mg-zn-re Higher Alloy Systemsmentioning

confidence: 99%

Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review

Tekumalla

Seetharaman

Almajid

2014

Metals

178

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“…The addition of RE [12] enhanced the castability and elevated temperature strength [13]. The RE additions are grain refiners, attributed mainly to the constitutional supercooling [14], which can lead to improved ductility at room temperature [15,16].…”

Section: Introductionmentioning

confidence: 99%

Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy

Mohedano

Arrabal

Mingo

et al. 2018

Surface and Coatings Technology

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The microstructure of ZK40, ZK40 with 2 wt.% of Nd and Gd (ZK40-2Nd and ZK40-2Gd, respectively) were investigated with optical, scanning and transmission electron microscopy, X-ray diffraction and Scanning Kelvin Probe Force Microscopy. The mechanical properties and the corrosion behaviour were correlated with the microstructure. The 2 wt.% Gd addition enhanced the ductility, while the Nd addition resulted in deterioration in mechanical properties. The corrosion behaviour was also enhanced with the addition of Gd.

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“…This is mainly attributed to the fine uniform dispersed precipitates and fine DRXed grains as well as relatively high DRXed fraction. The excellent ductility of the extrusion alloys is mainly ascribed to the following factors: which can also improve the ductility and strength [48]. As shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Extrusion temperature impacts on biometallic Mg-2.0Zn-0.5Zr-3.0Gd (wt%) solid-solution alloy

Yao

Wen

Xiong

et al. 2018

Journal of Alloys and Compounds

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To obtain ideal implant materials, we hot extruded Mg-2.0Zn-0.5Zr-3.0Gd solid-solution alloys, and studied extrusion temperature impacts on materials properties. Fine dynamic recrystallized (DRXed) grains (~5 μm) and elongated coarse un-dynamic recrystallized (unDRXed) deformed grains turned out at the range of 470-490 o C, but changed to bigger ones (~8 μm) and abnormal growth (30~40 μm) at 490-510 o C. Precipitated phases consist of rod-like (Mg, Zn)3Gd particles and newly precipitated Mg2Zn11 rectangles. The alloy extruded at 490 o C meets all mechanical and anticorrosive requirements for biomaterials, thanks to evenly distributed second phases via the solid solution, and the grain refinements through the hot extrusion.An ideal implant material should be equipped with proper mechanical properties and corrosion resistance, along with its biocompatibility. As a possible candidate, the magnesium (Mg) alloys have attracted considerable attentions for biomaterial applications due to their good biocompatibility and promising biodegradability [1-3].However, some key problems including rapid corrosion rate, localized corrosion mode and low mechanical properties remain to be solved before their practical applications as biomaterials [4]. Grain refinement may work for property improvements. The refinement leads to a decrease in the corrosion resistance in an active environment, but results in an increase of corrosion resistance in an encouraging passive environment [5]. In the simulated human environments where inert reaction happens, reduction in grain size would encourage lower rates of uniform corrosion. In earlier works, Ralston and Birbilis suggested that the increased grain boundary density compensate oxide/base metal mismatch by decreasing compressive stress that otherwise would lead to cracks in the oxide film [6][7]. The magnesium alloy surfaces were covered with more stable oxide layer with finer grains, accounting for better anticorrosive performances.Indeed, the Mg alloy refinements can be reached by typical thermo-mechanical processes such as hot rolling and hot extrusion. Corrosion resistances are improved in the hot rolled alloys [8][9]. It was reported that after rolling, the binary Mg alloys evolved less hydrogen and got lower corrosion rates when immersed in simulated body fluid (SBF) or Hank's solution [10]. Similar behavior has also been found in 3 hot-rolled Mg-X alloys (except for Mg0.1Zr and Mg0.3Si) [11]. Mechanical properties are enhanced with the method. An ultimate tensile strength (UTS) of 393 MPa, yield strength (YS) of 306 MPa and elongation to failure (EL) of 14.6% have been reached in the Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt %) alloy [12], and the numbers turn to 418 MPa, 330 MPa and 7.5% in the Mg-3Gd-1Zn-0.2Zr (at %) alloy [13]. Hot rolling the as-cast Mg-Gd-Zn-Zr-Mn alloy resulted in an elongation of 21.3% along with the low corrosion rate <0.5 mm/year [14]. On the other hand, hot extrusion was also applied to refine microstructures and improve mechanical properties of Mg alloys [15-18]. The ...

show abstract

Effects of minor Gd addition on microstructures and mechanical properties of the high strain-rate rolled Mg–Zn–Zr alloys

Cited by 87 publications

References 30 publications

Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review

Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review

Role of particle type and concentration on characteristics of PEO coatings on AM50 magnesium alloy

Extrusion temperature impacts on biometallic Mg-2.0Zn-0.5Zr-3.0Gd (wt%) solid-solution alloy

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