Improving the mechanical properties of pure magnesium through cold hydrostatic extrusion and low-temperature annealing

Volkov, A. Yu.; Kliukin, I.V.

doi:10.1016/j.msea.2014.12.104

Cited by 48 publications

(24 citation statements)

References 23 publications

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“…Such an unusual change of the mechanical properties of the Cu / Mg-composites is well explained by the phenomenon of a thermal anomaly of magnesium strength. It has been shown in our works [12,20] that low-temperature treatments lead to an increase in the yield stress of pre-deformed magnesium. The plasticity of magnesium does not change after such annealing.…”

Section: Confirms This Conclusionmentioning

confidence: 57%

“…The plasticity of magnesium does not change after such annealing. We believe, that the abnormal annealing hardening of pure magnesium can be explained by the thermally activated processes of rearrangement of the dislocation structure and self-blocking of a part of the dislocations [12]. The Cu / 1Mg-composite contains the largest amount of magnesium and, therefore, after annealing at 200°C it becomes the strongest one due to the annealing hardening phenomenon of pure magnesium.…”

Section: Confirms This Conclusionmentioning

confidence: 94%

“…For example, the yield stress of the annealed copper (73 MPa) is 1 / 5 that for the deformed copper (350 MPa). Unlike copper, annealing of the deformed magnesium at a temperature of 200°C leads to an increase in its yield stress: from 97 MPa to 127 MPa [12]. It is quite interesting, however, the strength of annealed Mg is higher compared with annealed Cu.…”

Section: Mechanical Properties Of the Cu / Mg-compositesmentioning

confidence: 99%

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Cu / Mg-composites: processing, structure and properties

2019

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The copper-based alloys with high strength and low electrical resistivity are of interest for many practical applications. In this study, Cu / Mg-composites with 1, 7 and 49 magnesium filaments in Cu-matrix have been obtained by hyrdoextrusion at room temperature. The structure, mechanical and electrical properties of the composite rods and thin wires in the deformed and annealed states have been investigated. The strength of the deformed Cu / Mg-composite with a minimal volume fraction of magnesium was found to be abnormally high. The increase of magnesium microhardness was revealed to be near the interface. A change in the lattice constant of the Cu-matrix in the deformed Cu / Mg-composites is discovered by the XRD-method. It has been concluded that, under severe plastic deformation, different solid solutions form on the Cu / Mg-interfaces due to mechanical alloying processes. The Cu / Mg-composite with a maximal volume fraction of Mg has the lowest strength in the deformed state, however, it becomes the strongest one after annealing at 200°C due to annealing hardening of magnesium. The temperature dependences of the electrical resistivity of Cu / Mg-composites differ significantly from each other. During heating, three eutectic transformations are realized in the composite with 7 Mg-filaments. As a result, the electrical resistivity of the deformed Cu / 7Mg-composite increases almost two times. The specific electrical resistivity of the composite with 49 Mg-filaments is a bit different from the electrical resistivity of deformed copper. The mechanisms of structure formation during the heating of these composites have been shown to be significantly different. The obtained results can be used for the development of high-strength Cu-based conductors.

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Section: Confirms This Conclusionmentioning

confidence: 57%

Section: Confirms This Conclusionmentioning

confidence: 94%

Section: Mechanical Properties Of the Cu / Mg-compositesmentioning

confidence: 99%

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Cu / Mg-composites: processing, structure and properties

2019

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“…In magnesium alloys, the typical grain size range usually obtained by static recrystallization is 8–25 μm [ 23 ]. Cold hydrostatic extrusion, followed by low-temperature annealing, can produce about 3 μm grains [ 24 ]. Dynamic recrystallization usually causes better grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

et al. 2020

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Surface mechanical attrition treatment (SMAT) was used to generate a gradient microstructure in commercial grade magnesium. Positron annihilation lifetime spectroscopy and variable energy positron beam measurements, as well as microhardness tests, electron backscatter diffraction, X-ray diffraction, and electrochemical corrosion tests, were used to investigate the created subsurface microstructure and its properties. It was found that SMAT causes an increase in dislocation density and grain refinement which results in increased hardness of the subsurface zone. The mean positron lifetime values indicate trapping of positrons in vacancies associated with dislocations and dislocation jogs. The increase of the SMAT duration and the vibration amplitude influences the depth profile of the mean positron lifetime, which reflects the defect concentration profile. Electrochemical measurements revealed that the structure induced by SMAT increases the susceptibility of magnesium to anodic oxidation, leading to the enhanced formation of hydroxide coverage at the surface and, as a consequence, to the decrease in corrosion current. No significant effect of the treatment on the residual stress was found.

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“…However, the use of magnesium alloys has been limited to narrow range because of the limited mechanical properties such as low hardness and low tensile strength [ 5 ]. Recently, a large number of research studies have focused on improving the mechanical properties of magnesium alloys by alloying [ 6 , 7 ], plastic deformation [ 8 – 12 ], or heat treatment [ 9 , 13 ]. However, the improvement of mechanical properties often results in a decline of damping capacity [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on the Damping Capacity and Mechanical Properties of Mg‐6Al‐1Zn Alloy

El-Morsy

Farahat

2015

The Scientific World Journal

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The damping capacity and mechanical properties of Mg-6Al-1Zn alloy after heat treatment were investigated. The damping characteristics of un-heat-treated, solution treated, and aged Mg-6Al-1Zn specimens were determined by measuring the damping ratio and the logarithmic decrement of free vibrations of a bending beam clamped at one side. The microstructural evaluations confirmed that the β-Mg17Al12 phase was reprecipitated after aging and increased with an increase in aging time. The peak level of damping ratio and logarithmic decrement was obtained after 34 hr of aging time, over which the damping capacity declined according to increasing amount of strong pining points.

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Improving the mechanical properties of pure magnesium through cold hydrostatic extrusion and low-temperature annealing

Cited by 48 publications

References 23 publications

Cu / Mg-composites: processing, structure and properties

Cu / Mg-composites: processing, structure and properties

Gradient Microstructure Induced by Surface Mechanical Attrition Treatment (SMAT) in Magnesium Studied Using Positron Annihilation Spectroscopy and Complementary Methods

Effect of Aging Treatment on the Damping Capacity and Mechanical Properties of Mg‐6Al‐1Zn Alloy

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