The Effects of Yttrium Element on Microstructure and Mechanical Properties of Mg-5 mass%Al-3 mass%Ca Based Alloys Fabricated by Gravity Casting and Extrusion Process

Son, Hyeon Taek; Lee, Jae Seol; Kang, Chang Seog; Bae, Jung Chan; Yoshimi, Kyosuke; Maruyama, Kouichi

doi:10.2320/matertrans.mc200777

Cited by 11 publications

(7 citation statements)

References 22 publications

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“…[ 21,25 ] Al 2 Y particles were also formed in many traditional bulk Mg–Al–Y alloys. [ 38,39 ] There are Al and Y concentrations in the interface thin layer, indicating the formation of Al–Y compounds at the original interface.…”

Section: Resultsmentioning

confidence: 99%

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Xian

Chen

et al. 2021

Adv Eng Mater

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AZ31/Mg‐Y/AZ31 composites are fabricated by hot rolling bonding. To identify the formation mechanism of the microstructure in the interface adjacent region, additional hot rolling or/and diffusion annealing are also conducted on the base of the initial AZ31/Mg‐Y/AZ31 composite. Scanning electron microscopy, energy dispersive spectroscopy, and electron backscatter diffraction are used to characterize the microstructures and chemical compositional distributions. Vicker's microhardness tests are conducted to determine the local mechanical property. It is found that in the Mg–Y layer of the AZ31/Mg‐Y/AZ31 composite, the grain size in the interface‐adjacent region is much finer than that in the central part. Much finer Al2Y particles compared with those in the traditional Mg–Al–Y alloys are formed in the interface‐adjacent region. The formation of the fine grain in the interface‐adjacent region may be mainly related to the Al2Y particles rather than the accommodation deformation between layers. Both the grain refinement and the formation of Al2Y particles contribute to strengthening of the Mg–Y layer. The results in this work may provide a novel method to prepare fine and dispersed high‐melting‐point particles in Mg alloys, thus leading to strong and high‐thermal‐stability Mg alloys.

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Section: Resultsmentioning

confidence: 99%

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Xian

Chen

et al. 2021

Adv Eng Mater

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“…Among all kinds of magnesium alloys, Mg-Al serial alloys are greatly attractive for their better castability, good corrosion resistance and acceptable mechanical properties [1,2], which are widely used in the automotive and aerospace industries [3,4]. 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.…”

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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“…Therefore, it is important to reduce the amount of the Mg 17 Al 12 phase and introduce thermally stable precipitates at the grain boundaries, as well as in the grains, by adding proper alloying elements. It is well known that alloys of the Mg–Al–Ca systems have significantly better mechanical properties at elevated temperature than Mg–Al alloys due to reduction of the volume fraction of the Mg 17 Al 12 phase and the formation of Al–Ca and Mg–Ca intermetallic compounds [–]. The presence of highly stable Laves phases at the grain boundaries and in the grains has a favorable effect on the creep properties of Mg–Al–Ca alloys [, ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure of MgAl5Ca3Sr alloy after creep deformation and high‐temperature heat treatment

Rzychoń

2014

Materialwissenschaft Werkst

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The paper presents results of microstructural investigations of MgAl5Ca3Sr magnesium alloys in the as‐cast condition, after creep tests at 180 °C, and after heat treatment at 450 °C for 4.5 hours. The microstructure of MgAl5Ca3Sr alloy is composed of α‐Mg solid solution, irregular shaped (Mg,Al)2Ca phase with C36 crystal structure, bulky (Mg,Al)17(Sr,Ca)2 phase, fine lamellar Mg2Ca phase with C14 structure, needle‐shaped Al2Ca precipitates with the C15 crystal structure. The precipitation of the needle‐shaped Al2Ca phase in the α‐Mg grains and spheroidization of the C14 phase were found after heat treatment at 450 °C in argon atmosphere. The (Mg,Al)2Ca (C36) and (Mg,Al)17(Sr,Ca)2 phases seems to be stable at 450 °C, however, the increasing of aluminum content in C36 compound was observed suggesting the initial stage of C36 → C15 transformation. After creep deformation at 180 °C precipitates of the Al2Ca phase were found in α‐Mg phase. The intermetallic compounds are stable at 180 °C. The MgAl5Ca3Sr alloy exhibits good creep resistance up to 75 MPa. Tensile properties are comparable to those of Mg‐RE‐Zn–Zr alloys.

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The Effects of Yttrium Element on Microstructure and Mechanical Properties of Mg-5 mass%Al-3 mass%Ca Based Alloys Fabricated by Gravity Casting and Extrusion Process

Cited by 11 publications

References 22 publications

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

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

Microstructure of MgAl5Ca3Sr alloy after creep deformation and high‐temperature heat treatment

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