Microstructural Evolution and Mechanical Properties of the As‐Cast and Extruded Mg–Gd Alloys

Tork, N. Bayat; Razavi, Seyed Hossein; Sadrnia, Hassan; Mahmudi, R.

doi:10.1002/adem.201500189

Cited by 32 publications

(9 citation statements)

References 26 publications

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“…After T4 heat treatment, no obvious change in grain occurs. More Gd addition and solid solution treatment have no apparent effects on grain size, which is in agreement with the study of Bayat Tork et al [25] According to the literature, a very coarse grain structure of Mg-Gd alloys could usually turn into a partially recrystallized structure with a high fraction of ultra-fine recrystallized grains and some coarse elongated grains due to the impedance of dynamic recrystallization caused by the solute Gd atoms. [26][27][28] This type of microstructure makes these alloys suitable for thermal deformation, where they can undergo further deformation and provide acceptable levels of strength.…”

Section: Chemical Composition and Microstructural Characterizationssupporting

confidence: 90%

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Effects of Minor Gadolinium Addition and T4 Heat Treatment on Microstructure and Properties of Magnesium

Huang

Bode³

et al. 2022

Adv Eng Mater

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Mg–Gd alloys are candidates for degradable implants combining favorable mechanical and corrosion properties. Gd has a high solid solubility in Mg and an acceptable biocompatibility. The influences of different amount of Gd additions and solid solution (T4) treatment on mechanical properties and corrosion in 0.9 wt% NaCl and cell culture medium (CCM) of magnesium are systematically investigated. The effects of Gd are clarified by microstructural characterizations as well as stress and degradation analysis. It is shown that minor Gd additions to pure Mg lead to Gd solid solution in Mg (α) and the formation of Mg5Gd intermetallic particles (IMPs), which increase the hardness, tensile, and compressive strength. The GdH2 phase is found in low‐alloyed Mg–Gd alloys. The corrosion rate (CR) is increased by the addition of more Gd due to the increased kinetics of the cathodic reaction. However, the resistance to degradation is effectively improved by T4 heat treatment due to the dissolution of IMPs. The reduced susceptibility to pitting can be achieved by a minor Gd addition and T4 heat treatment. The Mg–2Gd alloy is a potential candidate for implants due to its good combination of tailorable mechanical properties and low homogeneous in vitro degradation rate (DR).

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Section: Chemical Composition and Microstructural Characterizationssupporting

confidence: 90%

“…This is mainly due to the formation of more Mg 5 Gd IMPs during solidification, as well as limited solid solution strengthening. [ 25 ] Previous experimental results have shown a linear relationship between Gd content and microhardness. [ 32,33 ] The atomic radius of Mg (150 pm) is smaller than that of Gd (180 pm).…”

Section: Resultsmentioning

confidence: 99%

Effects of Minor Gadolinium Addition and T4 Heat Treatment on Microstructure and Properties of Magnesium

Huang

Bode³

et al. 2022

Adv Eng Mater

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Section: Resultsmentioning

confidence: 99%

“…Table 1 indicates that the atomic percentage of Mg (89.5%) and Gd (10.5%) at point 3 suggests that this particle should be Mg 5 Gd (83% of Mg and 17% of Gd, in at%) second phase which is in good agreement with the binary Mg-Gd phase diagram [42] and reports in the literature. [51][52][53] Figure 4 presents SEM micrographs with different magnifications near the center of the sample processed for N = 1/4 turn and at the edges for the samples processed for N = 1/2 and 10 turns where the equivalent strains for these three conditions are %0.3, %11.5, and %230, respectively. The disc processed for N = 1/4 turn reveals an interesting microstructural evolution of the Mg-0.6Gd alloy.…”

Section: Microstructure Characterization Using Sem and Tem After Hpt ...mentioning

confidence: 99%

Investigation of Microstructure and Texture Evolution in an AZ31/Mg–Gd Alloy Hybrid Metal Fabricated by High‐Pressure Torsion

et al. 2023

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High-pressure torsion (HPT) processing is successfully applied to fabricate a novel hybrid material from separate discs of AZ31 (Mg-3Al-1Zn, wt%) and Mg-0.6Gd (wt%) alloys by straining through numbers of rotations, N, of 1/4, 1/2, 5, 10, and 20 turns at room temperature. The microstructure and texture are investigated near the bonding interface through the disc diameter using electron backscatter diffraction (EBSD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The microstructure exhibits two grain refinement regimes with the first occurring during an equivalent strain range, ε eq , of %0.3-72 and the second during ε eq from %72 to 517. The general texture changes from B-fiber to Y-fiber and C 2 -fiber through the HPT processing. The resultant microstructures and textures of this hybrid alloy are examined separately for the AZ31 and Mg-0.6Gd alloys and found controlled by the presence of twinning, slip systems, and second phases and the occurrence of different dynamic recrystallization mechanisms.

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“…The majority of research works, however, have been performed on the Gd-containing Mg alloys, which also contain Y, Zn, and Zr [11,12]. Nevertheless, various aspects of the as-cast and extruded Mg-Gd binary alloys containing different amounts of Gd have been considered in some details [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Strain-rate sensitivity of Mg–Gd alloys after extrusion and simple shear extrusion

Tork

Razavi

Sadrnia

et al. 2017

Materials Science and Technology

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Pure Mg and Mg–Gd alloys with 0.5–2 wt-% gadolinium (Gd) were processed by extrusion and simple shear extrusion (SSE). The strain-rate sensitivity (SRS) was investigated by shear punch testing (SPT) at temperatures ranging from 573 to 723 K and for shear strain rates ranging between 0.016 and 0.13 s−1. The Gd-containing alloys processed by SSE showed small m-values at 573 K, which increased with increasing temperature up to 673 K, and decreased afterwards due to grain growth. The highest SRS index (0.47) was found at 673 K for Mg-2Gd after 4 passes of SSE, coinciding with the finest grain size (2 µm). This implies that the material can behave superplastically via a grain boundary sliding mechanism. This paper is part of a thematic issue on Light Alloys.

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Microstructural Evolution and Mechanical Properties of the As‐Cast and Extruded Mg–Gd Alloys

Cited by 32 publications

References 26 publications

Effects of Minor Gadolinium Addition and T4 Heat Treatment on Microstructure and Properties of Magnesium

Effects of Minor Gadolinium Addition and T4 Heat Treatment on Microstructure and Properties of Magnesium

Investigation of Microstructure and Texture Evolution in an AZ31/Mg–Gd Alloy Hybrid Metal Fabricated by High‐Pressure Torsion

Strain-rate sensitivity of Mg–Gd alloys after extrusion and simple shear extrusion

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