Structure and mechanical properties of the Mg-Y-Gd-Zr alloy after high pressure torsion

Добаткин, С. В.; Рохлин, Л. Л.; Lukyanova, E. A.; Murashkin, M. Yu.; Dobatkina, T. V.; Tabachkova, N. Yu.

doi:10.1016/j.msea.2016.05.003

Cited by 53 publications

(31 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The saturation (or maximum) hardness values for different magnesium alloys are summarized in Table with the minimum grain sizes reported. The hardness saturation in commercial alloys are typically in the range of ≈110–130 kgf mm −2 but slightly larger hardness values are observed in alloys with a high content of rare earth elements . The evolution of hardness in Mg alloys with a high content of alloying elements may be affected by previous thermal treatments .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…The increase in strength due to the HPT processing of magnesium alloys usually leads to a brittle behavior in tension but processing at high temperatures can increase the strength and provide limited ductility. For example, a Mg‐4.7% Y‐4.6% Gd‐0.3% Zr alloy exhibited yield and ultimate stresses of ≈450 MPa and ≈475 MPa, respectively, with an elongation of 2.5% when processed at 200 °C and a WE43 alloy exhibited a yield strength of over 300 MPa with an elongation of ≈1% when processed in the range of 200–300 °C . Also, a short annealing after HPT processing may increase the ductility.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Figueiredo

Langdon

2018

Adv Eng Mater

View full text Add to dashboard Cite

Magnesium and its alloys have attracted significant attention in recent years because they display high strength-to-density ratios, they are biodegradable and they provide a potential for hydrogen storage. Many investigations have examined the effect of high-pressure torsion processing on the microstructures and properties of these materials so that numerous reports are now available. This overview provides a summary of the observations reported to date on the structure and mechanical property evolution including the nature of grain refinement, the grain boundary misorientation distributions, texture evolution, and the minimum grain size. For convenience, the mechanical properties are separated into hardness, tensile behavior, and superplastic properties. It is shown that the mechanism of grain refinement differs from other metallic materials processed by severe plastic deformation but high strength may be achieved in magnesium alloys and exceptional ductility in pure magnesium. Hydrogen storage and corrosion behavior are also examined together with a discussion of recent attempts to produce magnesium-based nanocomposites through processing by high-pressure torsion.

show abstract

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Figueiredo

Langdon

2018

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…An extruded Mg-9Gd-4Y-0.4Zr (wt%) alloy with an initial grain size of ~8.6 μm was refined to ~85 nm through HPT for 16 turns, and the HPT processed alloy exhibited superplastic behavior with a maximum strain rate sensitivity of ~0.51 at 350 o C [13]. A partially nanocrocrystalline structure with a grain size of 20-30 nm was formed in the Mg-4.7Y-4.6Gd-0.3Zr (wt%) alloy after HPT processing at room temperature, while a grain size of 60-90 nm was achieved through HPT processing at 200 o C [14].…”

Section: Introductionmentioning

confidence: 99%

Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion

Sun

Qiao

et al. 2017

Materials Science and Engineering: A

View full text Add to dashboard Cite

Abstract:The novel Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with high content of rare earth elements has been processed successfully by high pressure torsion (HPT) starting from an as-cast condition. HPT processing was conducted at room temperature for a range of turns from 1/8 to 16, and the evolutions of microstructure and microhardness were investigated.The average grain size decreases from ~85 μm in the as-cast condition to ~55 nm when the equivalent strain reaches ~6.0, and remains almost constant on further strain increase. Meanwhile, the coarse netlike Mg3(Gd,Y) second phase structures are gradually broken into fine dispersed particles and the dislocation density increases. The microhardness of the alloy increases with increasing strain, and when the equivalent strain reaches ~6.0, the microhardness reaches a saturated value of about 115 HV, which is higher than that obtained by conventional extrusion / rolling of this alloy. The full range of possible mechanisms of hardening are analysed and this reveals that hardening is primarily due to the pronounced grain refinement, which is substantially 2 stronger than that for HPT-processed conventional Mg alloys, and to the homogeneously distributed fine second phase particles and the high dislocation density.

show abstract

“…Mg-Dy-Al-Zn-Zr [9] and Mg-Gd-Y-Zr [10,11] alloys. In these works, the hardness of the HPT-processed Mg-RE alloys studied was generally lower than 110 HV over all or most of the disk, i.e.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of a nanostructured Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr supersaturated solid solution prepared by high pressure torsion

et al. 2017

View full text Add to dashboard Cite

In this study, a solution-treated Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy was processed by high pressure torsion (HPT) at room temperature, with the aim of producing a material with exceptional mechanical properties. Transmission electron microscopy and X-ray diffraction line broadening analysis reveal that a nanostructured supersaturated solid solution with a mean grain size of ~48 nm and high dislocation density of ~4.7×10 14 m-2 is achieved by HPT deformation. After HPT processing, the present solution-treated samples show finer grains and higher dislocation densities as compared to as-cast samples of this alloy, other solution-treated Mg-RE alloys and conventional Mg alloys deformed using similar HPT processing conditions. This could be attributed to retardation of the dislocation annihilation through enhanced solutedislocation and / or dislocation-dislocation interactions. The higher dislocation density and nanosized grains within supersaturated solid solution cause the microhardness to increase to ~126 HV, which is higher than that of the as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy processed by HPT, and is also higher than that of any conventional Mg-rich alloy deformed using HPT.

show abstract

Structure and mechanical properties of the Mg-Y-Gd-Zr alloy after high pressure torsion

Cited by 53 publications

References 20 publications

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Processing Magnesium and Its Alloys by High‐Pressure Torsion: An Overview

Evolution of microstructure and mechanical properties of an as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy processed by high pressure torsion

Microstructure and mechanical properties of a nanostructured Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr supersaturated solid solution prepared by high pressure torsion

Contact Info

Product

Resources

About