Effects of samarium (Sm) additions on the microstructure and mechanical properties of as-cast and hot-extruded Mg-5wt%Al-3wt%Ca-based alloys

Son, Hyeon Taek; Lee, Jae Seol; Kim, Dae Guen; Yoshimi, Kyosuke; Maruyama, Kouichi

doi:10.1016/j.jallcom.2008.06.016

Cited by 50 publications

(15 citation statements)

References 17 publications

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“…The existence of Mg-La alloy could not be observed in the XRD pattern, which is explained by the fact that the La atom is easier to combine with the Al atom or that the energy of the La metal when alloyed with the Al metal was lower. The similar phenomena had been observed by Guo and HyeonTaek Son et al [39,40] in the Sm-containing alloys. From Table II, the Li content is more than 20 pct, and some Li metal was oxidized in the air during or before this test The microstructures of the Mg-Li-Al-La alloy (Sample 3) by galvanostatic electrolysis from La 2 O 3 in molten salts LiCl-KCl-MgCl 2 at 853 K (580°C) are given in Figure 12.…”

Section: B Electrochemical Formation Of Mg-li-al-la Alloys On the Insupporting

confidence: 87%

Electrodeposition of Mg-Li-Al-La Alloys on Inert Cathode in Molten LiCl-KCl Eutectic Salt

Han

Chen²,

Sun

et al. 2011

Metall Mater Trans B

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Electrochemical preparation of Mg-Li-Al-La alloys on inert electrodes was investigated in LiClKCl melt at 853 K (580°C). Cyclic voltammograms (CVs) and square wave voltammograms (SWVs) show that the existence of AlCl 3 or AlF 3 could promote La deposition on an active Al substrate, which is predeposited on inert electrodes. All electrochemical tests show that the reduction of La 3+ is a one-step reduction process with three electrons exchanged. The reduction of La(III)fiLa(0) occurred at -2.04 V, and the underpotential deposition (UPD) of La was detected at -1.55 V (vs Ag/AgCl). The same phenomena concerning La UPD were observed on two inert cathodes, W and Mo. In addition, Mg-Li-Al-La alloys were obtained by galvanostatic electrolysis on the W cathode from La 2 O 3 in LiCl-KCl-MgCl 2 -KF melts with aluminum as the anode. X-ray diffraction (XRD) measurements indicated that various phases like the Al 2 La, Al 12 Mg 17 , and bLi phase (LiMg/Li 3 Mg 7 ) existed in the Mg-Li-Al-La alloys. The distribution of Mg, Al, and La in Mg-Li-Al-La alloys from the analysis of a scan electron micrograph (SEM) and energy dispersive spectrometry (EDS) indicated that the elements Mg, Al, and La distributed homogeneously in the alloys.

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Section: B Electrochemical Formation Of Mg-li-al-la Alloys On the Insupporting

confidence: 87%

Electrodeposition of Mg-Li-Al-La Alloys on Inert Cathode in Molten LiCl-KCl Eutectic Salt

Han

Chen²,

Sun

et al. 2011

Metall Mater Trans B

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“…However, the main strengthening phase in Mg-Al serial alloys is b phase (Mg 17 Al 12 ), which is not a thermal stability phase and usually leads to the rapid degradation of the mechanical properties of Mg-Al serial alloys at elevated temperatures, especially the creep resistance. Thus, the applications of these alloys are limited to specific components that operate at temperature below 423 K [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…Watanable et al [15] reported that the Mg-6Al-2Ca alloy extruded at 663 K exhibited equiaxed grains, spherical particles and good mechanical properties. Furthermore, Son et al [5] showed that the fine and homogeneous microstructure was obtained when the Mg-5Al-3Ca alloy was extruded at 653 K. However, up to now, limited data are available about the effect of extrusion temperature for the processing of Mg-Al-Ca alloys. Therefore, the primary aim of the present work is to study the effect of extrusion temperature on the microstructure and mechanical properties of MgAl-Ca alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of Extrusion Temperature on the Microstructure and Mechanical Properties of Mg–5Al–2Ca Alloy

Deng

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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In this work, the Mg-5Al-2Ca alloy was extruded at 573, 623 and 673 K, with a ratio of 16:1 and a constant speed of 3 mm/s. Results demonstrate that the Al 2 Ca particle is formed in Mg-5Al-2Ca alloy. The size, amount and distribution of Al 2 Ca particles are influenced evidently by extrusion temperature. Unlike previous reports, the intensity of basal texture increases with increasing extrusion temperature, and the reasons are analyzed and given. Even though the average grain size increases as the extrusion temperature increased from 573 to 623 K, the YS, UTS and elongation of asextruded Mg-5Al-2Ca alloy are almost kept the same at 573 and 623 K. The reason is speculated as the balance of grain size, Al 2 Ca phase and texture at the two temperatures. The work hardening rate depends on extrusion temperature, and the largest h value of Mg-5Al-2Ca alloy is obtained when the extrusion was performed at 623 K.

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“…The microstructure and mechanical properties of Sm-containing Mg alloys have been investigated by some researchers. [9][10][11] These authors found that Sm could improve the strength of Mg alloys by both precipitation strengthening and solution strengthening mechanisms [the solid solubility of Sm in Mg is 5.7 wt pct at 813 K (540°C)]. Therefore, it is reasonable to assume that addition of Sm is effective in improving the properties of Mg-Li alloys.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Formation of Mg–Li–Sm Alloys by Codeposition from LiCl–KCl–MgCl2–SmCl3 Molten Salts

Han

Wang

Yang

et al. 2011

Metall Mater Trans B

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In this article, the electrochemical method of preparing Mg-Li-Sm alloys by codeposition in LiCl-KCl-MgCl 2 -SmCl 3 melts was investigated. Transient electrochemical techniques, such as cyclic voltammetry, chronopotentiometry, and chronoamperometry were used to explore the electrochemical formation of Mg-Li-Sm alloys. Chronopotentiograms demonstrated that the codepositon of Mg, Li, and Sm occurred when current densities were more negative than À0.31 A cm À2 . Chronoamperograms indicated that the onset potential for the codeposition of Mg, Li, and Sm was À2.40 V, and the codeposition of Mg, Li, and Sm was formed when the applied potentials were more negative than À2.40 V. The different phases of Mg-Li-Sm alloys were prepared by galvanostatic electrolysis and characterized by X-ray diffraction (XRD), optical microscope (OM), and scanning electron microscopy (SEM). An inductively coupled plasma (ICP) analysis showed that the lithium and samarium contents in Mg-Li-Sm alloys could be controlled by the concentrations of MgCl 2 and SmCl 3 . The results demonstrated that Sm could refine the grains dramatically. When the Sm content was 0.8 wt pct, the grain size was the finest.

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Effects of samarium (Sm) additions on the microstructure and mechanical properties of as-cast and hot-extruded Mg-5wt%Al-3wt%Ca-based alloys

Cited by 50 publications

References 17 publications

Electrodeposition of Mg-Li-Al-La Alloys on Inert Cathode in Molten LiCl-KCl Eutectic Salt

Electrodeposition of Mg-Li-Al-La Alloys on Inert Cathode in Molten LiCl-KCl Eutectic Salt

Effect of Extrusion Temperature on the Microstructure and Mechanical Properties of Mg–5Al–2Ca Alloy

Electrochemical Formation of Mg–Li–Sm Alloys by Codeposition from LiCl–KCl–MgCl2–SmCl3 Molten Salts

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