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Effects of temperature on critical resolved shear stresses of slip and twining in Mg single crystal via experimental and crystal plasticity modeling

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镁合金学报(英文) 2023年第6期11卷 2027-2041页

作者： Kwang Seon Shin Lifei Wang Mingzhe Bian Shihoon Choi alexander komissarov Viacheslav Bazhenov Magnesium Technology Innovation Center Department of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryDelegatskaya 20/1Moscow127473 Russia Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Departments of Advanced Components and Materials Engineering Sunchon National UniversitySuncheonJeonnam57922Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia Casting Department National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia

Magnesium(Mg)single crystal specimens with three different orientations were prepared and tested from room temperature to 733 K in order to systematically evaluate effects of temperature on the critical resolved shear stress(CRSS)of slips and twinning in Mg single *** duplex non-basal slip took place in the temperature range from 613 to 733 K when the single crystal samples were stretched along the*** contrast,the single basal slip and prismatic slip were mainly activated in the temperature range from RT to 733 K when the tensile directions were inclined at an angle of 45°with the basal and the prismatic plane,*** self-consistent(VPSC)crystal modeling simulations with genetic algorithm code(GA-code)were carried out to obtain the best fitted CRSSs of major deformation modes,such as basal slip,prismatic slip,pyramidalⅡ,{1012}tensile twinning and{1011}compressive twinning when duplex slips accommodated ***,CRSSs of the basal and the prismatic slip were derived using the Schmid factor(SF)criterion when the single slip mainly accommodated *** the CRSSs of major deformation modes obtained by the VPSC simulations and the SF calculations,the CRSSs for basal slip and{1012}tensile twinning were found to show a weak temperature dependence,whereas those for prismatic,slip and{1011}compressive twinning exhibited a strong temperature *** the comparison of previous results,VPSC-GA modeling was proved to be an effective method to obtain the CRSSs of various deformation modes of Mg and its alloys.

关键词： Magnesium Single crystal Critical resolve shear stress Slip Twinning

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Gallium-containing magnesium alloy for potential use as temporary implants in osteosynthesis

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Journal of Magnesium and Alloys 2020年第2期8卷 352-363页

作者： Viacheslav Bazhenov Andrey Koltygin alexander komissarov Anna Li Vasiliy Bautin Regina Khasenov Alexey Anishchenko alexander Seferyan Julia komissarova Yuri Estrin Foundry Department National University of Science and Technology"MISiS"Leninsky pr.4119049 MoscowRussian Federation Laboratory of Hybrid Nanostructured Materials National University of Science and Technology"MlSiS"Leninsky pr.4119049 MoscowRussian Federation Department of Metallurgy of Steel New Production Technologies and Protection of MetalsNational University of Science and Technology"MISiS"Leninsky pr.4119049 MoscowRussian Federation Department of Materials Science and Engineering Monash UniversityClayton VIC 3800Australia Department of Mechanical Engineering The University of Western AustraliaCrawleyWA 6009Australia

In recent years magnesium alloys have been studied intensively with a view to their potential use in bioresorbable medical *** the present work the microstructure and the corrosion properties of a new bioresorbable Mg-4 wt%Ga-4 wt%Zn alloy and its variants with low Ca,Nd or Y additions were *** alloys are of interest due to the efficacy of gallium as an element inhibiting bone resorption,osteoporosis,Paget's disease,and other illnesses.A severe plastic deformation technique of equal channel angular pressing(ECAP)was shown to provide the alloys with favorable mechanical *** addition,a desirable low rate of degradation in a simulated body fluid(Hanks'solution)was achieved.

关键词： Bioresorbable materials Magnesium alloys Gallium ECAP Hanks'solution Simulated body fluid

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Recent research progress on magnesium alloys in Korea:A review

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Journal of Magnesium and Alloys 2023年第10期11卷 3545-3584页

作者： Sung Hyuk Park Ye Jin Kim Hyun Ji Kim Sang-Cheol Jin Jong Un Lee alexander komissarov Kwang Seon Shin School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and TechnologyMoscow 119049Russia Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryMoscow 127473Russia Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National UniversitySeoul 08826Republic of Korea

This review highlights the recent advancements in Mg research in South Korea with a prime focus on high-speed-extrudable Mg–Bi-based alloys for high productivity and strength, innovative techniques utilizing {10–12} twinning for improved mechanical properties, and alloying and processing methods for enhanced corrosion resistance. High-alloyed Mg–Bi-based alloys possess thermally stable α-Mg matrix and secondary phase, which ensures high-speed extrusion of these alloys at elevated temperatures without hot cracking. Consequently, they exhibit outstanding extrudability with a maximum extrusion speed of up to 70 m/min. Furthermore, their high alloying contents offer excellent strength even after high-speed extrusion through strong solid solution hardening and particle hardening effects, making them suitable for high-performance extruded Mg products. The pre-twinning process utilizing {10–12} twinning and the combined process of pre-twinning and subsequent annealing have shown promise in controlling microstructure and texture of wrought Mg alloys and thus enhancing their mechanical properties. The pre-twinning process enhances tensile strength, fatigue properties, and age-hardening rate of Mg alloys. Furthermore, the combined processes of pre-twinning and subsequent annealing considerably improve their ductility, stretch formability, bending formability,and damping capacity. Efforts have been made to improve the corrosion resistance of Mg alloys through alloying additions, process treatments,and surface coatings. Alloying elements like Ca, Sc, and Sm alter the microstructural features(such as secondary phases and grain size)that affect the corrosion phenomenon. Process treatments such as multidirectional forging, screw rolling, and pulse electron beam can also improve the corrosion resistance by refining the microstructure. Furthermore, advanced surface coating technologies can create durable and corrosion-resistant layers for effectively protecting the Mg alloys. All th

关键词： South Korea Mg–Bi alloys {10–12}twinning Corrosion Mechanical properties

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