Superior Properties of Mg–4Y–3RE–Zr Alloy Prepared by Powder Metallurgy

Kubásek, Jiří; Dvorský, Drahomír; Čavojský, Miroslav; Vojtěch, Dalibor; Beronská, Naďa; Fousová, Michaela

doi:10.1016/j.jmst.2016.09.019

Cited by 57 publications

(37 citation statements)

References 71 publications

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“…Its main advantages are a good strength to weight ratio and biocompatibility in combination with biodegradability. However, due to the high reactivity of pure Mg and the mechanical properties, not really sufficient for engineering applications, mainly magnesium alloys are used [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Good mechanical properties of magnesium and its alloys can be furthermore significantly upgraded by decreasing the grain size, nowadays performed mainly via severe plastic deformation (SPD) techniques [3,5], powder metallurgy (PM) processing [1,2,6,7] or by a combination of both methods. Decreasing the metallic grain size within the material volume, either by alloying elements, SPD methods, such as extrusion, equal channel angular pressing (ECAP) and high-pressure torsion (HPT) or PM, leads to increase of hardness, tensile and yield strength, but the plasticity of the material was shown to be decreased [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Conversion coatings are widely studied as corrosion protection for magnesium and its alloys. Fluoride and calcium phosphate-based conversion coatings have a great potential of reducing the corrosion rate of biomedical magnesium implants [1][2][3][4][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Zapletal

Březina

Krystýnová

et al. 2017

Metals

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Magnesium with its mechanical properties and nontoxicity is predetermined as a material for biomedical applications; however, its high reactivity is a limiting factor for its usage. Powder metallurgy is one of the promising methods for the enhancement of material mechanical properties and, due to the introduced plastic deformation, can also have a positive influence on corrosion resistance. Pure magnesium samples were prepared via powder metallurgy. Compacting pressures from 100 MPa to 500 MPa were used for samples' preparation at room temperature and elevated temperatures. The microstructure of the obtained compacts was analyzed in terms of microscopy. The three-point bending test and microhardness testing were adopted to define the compacts' mechanical properties, discussing the results with respect to fractographic analysis. Electrochemical corrosion properties analyzed with electrochemical impedance spectroscopy carried out in HBSS (Hank's Balanced Salt Solution) and enriched HBSS were correlated with the metallographic analysis of the corrosion process. Cold compacted materials were very brittle with low strength (up to 50 MPa) and microhardness (up to 50 HV (load: 0.025 kg)) and degraded rapidly in both solutions. Hot pressed materials yielded much higher strength (up to 250 MPa) and microhardness (up to 65 HV (load: 0.025 kg)), and the electrochemical characteristics were significantly better when compared to the cold compacted samples. Temperatures of 300 • C and 400 • C and high compacting pressures from 300 MPa to 500 MPa had a positive influence on material bonding, mechanical and electrochemical properties. A compacting temperature of 500 • C had a detrimental effect on material compaction when using pressure above 200 MPa.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Zapletal

Březina

Krystýnová

et al. 2017

Metals

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“…The results from tensile tests of the extruded profile compared to WE43 PM (the results published by Kubásek in [30,31]) are summarized in Fig. 3a.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…It should be mentioned that the mechanical properties of WE43 alloy are mainly given by the amount of additive RE elements (Y, Nd) that reinforce the material at the grain boundaries [30]. Moreover, the grain size of this material is also crucial since the size is rather small (100 µm) and according to Hall-Petch equation [33], the size of the grains strengthens the material due to grain boundary strengthening mechanism.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure and mechanical properties of extruded profiles made from pure magnesium powders

Čavojský¹,

Trembošová²,

Beronská³

et al. 2020

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Magnesium-based biomaterials are good candidates as a new generation of biodegradable metals since magnesium (Mg) can dissolve in body fluid. Therefore, implanted Mg can degrade during the healing process, and if the degradation rate is controlled no debris after completion of healing is expected. Besides its biocompatibility, inherent mechanical properties of Mg are very similar to those of human bone. This paper is focused on the possibility to prepare the pure Mg material from powders with further intention to use it as a biodegradable implant. Powders were consolidated via cold compaction to prepare the extrusion billets which were subsequently directly extruded to final profiles at a controlled temperature to avoid the formation of the thick oxide layer. The microstructure is revealed through SEM, SEM--EBSD, TEM, and HRTEM and mechanical properties are determined via a uniaxial tensile test. Results are compared with Mg ingot and WE43 alloy, which is commercially used for biodegradable (biocompatible) material. K e y w o r d s : magnesium, powder metallurgy, biocompatibility, microstructure, mechanical properties

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Super‐High Strength Mg–7.5Al–0.8Zn Alloy Prepared by Rapidly Solidified Powder Metallurgy and Low Temperature Extrusion

et al. 2017

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In this work, Mg-7.5Al-0.8Zn alloy with super-high tensile strength are fabricated by rapidly solidified powder metallurgy (RS/PM) and low temperature extrusion technology. By reducing extrusion temperature from 340 to 170 C, the α-Mg grains are significantly refined and numerous nanoscale β-Mg 17 Al 12 particles are obtained. The RS/PM alloy extruded at 170 C possesses the lowest grain size of %550 nm. The nanoscale β-phase particles stimulate the nucleation of dynamically recrystallized (DRXed) grains and restrain the growth of DRXed grains. The RS/PM alloy extruded at 170 C exhibits mechanical properties with a tensile yield strength of 448 MPa, an ultimate tensile strength of 480 Mpa, and a microhardness of 137 HV. These excellent mechanical properties result from low temperature extrusion are mainly attributed to the ultra-fine DRXed grains and the high-density dislocations and subgrains.

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Superior Properties of Mg–4Y–3RE–Zr Alloy Prepared by Powder Metallurgy

Cited by 57 publications

References 71 publications

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Microstructure and mechanical properties of extruded profiles made from pure magnesium powders

Super‐High Strength Mg–7.5Al–0.8Zn Alloy Prepared by Rapidly Solidified Powder Metallurgy and Low Temperature Extrusion

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