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Characterization of the High-Strength mg–3Nd–0.5Zn Alloy Prepared by Thermomechanical Processing

Acta metallurgica Sinica(English Letters) 2019年第3期32卷 321-331页

作者： Ji■í Kub■sek Drahomír Dvorsk■ Jozef Vesel■ Peter min■rik m■ria zemkov■ Dalibor Vojtěch Department of metals and Corrosion Engineering Faculty of Chemical Technology University of Chemistry and Technology Prague Department of Physics of materials Charles University

magnesium alloys based on Nd and Zn are promising materials for both aviation industry and medical *** mechanical properties of these materials can be achieved by thermomechanical processing such as extrusion or rolling and by aging treatment, which can significantly strengthen the alloy. The question remains especially about the connection of texture strength created in the alloys based on the specific conditions of preparation. This work focuses on the mg–3 Nd–0.5 Zn magnesium alloy prepared by hot extrusion of the as-cast state at two different temperatures combined with heat pre-treatment. Extrusion ratio of 16 and rate of 0.2 mm/s at 350 and 400 °C were selected for material preparation. The structures of prepared materials were studied by scanning electron microscopy and transmission electron microscopy. The effect of microstructure on mechanical properties was evaluated. Obtained results revealed the strong effect of thermal pre-treatment on final microstructure and mechanical properties of extruded materials. The Hall–Petch relation between grain size and tensile yield strength has been suggested in this paper based on the literature review and presented data. The observed behavior strongly supports the fact that the Hall–Petch of extruded mg–3Nd–0.5 Zn alloys with different texture intensities cannot be clearly estimated and predicted. In addition, Hall–Petch relations presented in literature can be sufficiently obtained only for fraction of the mg–3Nd–0.5 Zn alloys.

关键词： mg–Nd–Zn alloys Extrusion Thermal treatment microstructure mechanical properties

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Corrosion and mechanical properties of a novel biomedical WN43magnesium alloy prepared by spark plasma sintering

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Journal of magnesium and Alloys 2021年第3期9卷 853-865页

作者： michal Knapek mária zemková Adam Gres Eva Jablonská Frantisek Lukác Robert Král Jan Bohlen Peter minárik Charles University Faculty of Mathematics and PhysicsKe Karlovu 512116 PragueCzech Republic Nuclear Physics Institute of CAS Řež13025068ŘežCzech Republic University of Chemistry and Technology Department of Biochemistry and MicrobiologyTechnická5Prague16628 PragueCzech Republic Institute of Plasma Physics of CAS Za Slovankou 318200 PragueCzech Republic Helmholtz-Zentrum Geesthacht Magnesium Innovation Centre(MagIC)D21502 GeesthachtGermany

Alloying of mg with rare-earth(RE)elements proved to be beneficial for their in-vitro and in-vivo *** this work,a novel WN43(mg-4 wt%Y-3 wt%Nd)alloy with a well-defined composition was prepared,where,unlike in the commercial WE43 alloy,the possibly harmful RE mischmetal was substituted by less toxic Nd.A modern spark plasma sintering(SPS)technique was used to effectively produce WN43 samples from atomized *** temperatures of 400℃-550℃ and holding times of 3 or 10 min were used and wellcompacted final materials were successfully *** was shown that a superior combination of corrosion and mechanical properties was attained in the samples sintered at 500℃ and 550℃,while the effect of sintering time was rather *** performance of this material was exceptional within the group of mg alloys prepared by powder metallurgy and comparable with conventionally prepared ***,it was shown that a great variety of mechanical and corrosion characteristics can be obtained by altering the SPS parameters so as to fulfill case-specific requirements typical of biomedical ***,the novel WN43 alloy prepared by SPS seems to be a particularly suitable material for biomedical use.

关键词： magnesium Biocompatibility Powder Sintering Corrosion Rare earth element

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Comparative analysis of microstructure,mechanical,and corrosion properties of biodegradable mg-3Y alloy prepared by selective laser melting and spark plasma sintering

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Journal of magnesium and Alloys 2024年第4期12卷 1496-1510页

作者： P.minárik m.zemková S.Šašek J.Dittrich m.Knapek F.Lukáˇc D.Koutný J.Jaroš R.Král Faculty of mathematics and Physics Charles UniversityKe Karlovu 5Praha 12116Czech Republic Research Centre University ofŽilinaUniverzitná8215/1Žilina 01026Slovakia Institute of Plasma Physics of the Czech Academy of Sciences Za Slovankou 1782/318200 Praha 8Czech Republic Institute of machine and Industrial Design Brno University of TechnologyTechnická2896/2Brno 61669Czech Republic

This work explored possibilities of biodegradable magnesium alloy mg-3Y preparation by two modern powder metallurgy techniques–spark plasma sintering(SPS)and selective laser melting(SLm).The powder material was consolidated by both methods utilising optimised parameters,which led to very low porosity(∼0.3%)in the SLm material and unmeasurably low porosity in the SPS *** main aim of the study was the thorough microstructure characterisation and interrelation between the microstructure and the functional properties,such as mechanical strength,deformability,and corrosion *** materials showed comparable strength of∼110 mPa in tension and compression and relatively good deformability of∼9%and∼21%for the SLm and SPS materials,*** corrosion resistance of the SPS material in 0.1 m NaCl solution was superior to the SLm one and comparable to the conventional extruded *** digital image correlation during loading and the cross-section analysis of the corrosion layers revealed that the residual porosity and large strained grains have the dominant negative effect on the functional properties of the SLm *** the other hand,one of the primary outcomes of this study is that the SPS consolidation method is very effective in the preparation of the W3 biodegradable alloy,resulting in material with convenient mechanical and degradation properties that might find practical applications.

关键词： magnesium Yttrium Powder metallurgy microstructure mechanical strength Corrosion resistance

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