Ca-modified Al–Mg–Sc alloy with high strength at elevated temperatures due to a hierarchical microstructure

Du, Haiquan; Zhang, Shasha; Zhang, Bingyi; Tao, Xinyong; Yao, Zhengjun; Белов, Н. А.; Zwaag, Sybrand van der; Liu, Yijie

doi:10.1007/s10853-021-06310-5

Cited by 18 publications

(7 citation statements)

References 53 publications

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“…The strengthening mechanism of the A356 alloy mainly includes fine grain strengthening, second phase strengthening and solution strengthening [ 35 , 36 , 37 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Song

Wang

et al. 2022

Materials

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Ultrasonic treatment was applied to an A356 aluminum melt with different modifiers, and the effects of ultrasonic treatment on the structure and properties of the A356 alloy were studied. The results showed that α-Al was effectively refined with different ultrasonic modification treatments. In particular, ultrasonic treatment showed the most obvious refinement with macroscopic grains of unmodified alloy and optimized the refinement of secondary dendrite arm spacings in the Sr/Ce synergistic alloys. The eutectic Si of the unmodified A356 alloy had no obvious change after the ultrasonic treatment, but the branch diameter of the eutectic Si reduced in the Sr and Sr/Ce modification alloys after the ultrasonic treatment. The ultrasonic treatment significantly improved the ultimate tensile strength and elongation of the as-cast A356 alloy with the unmodified material, which was due to refinement of the α-Al grains by the ultrasonic treatment. After the T6 heat treatment, the ultimate tensile strength values of the alloys showed no obvious change due to the ultrasonic treatment, but the plasticity of the alloy was significantly improved. Mg2Si precipitation was the dominant strengthening mechanism during the T6 heat treatment, while the plasticity was determined by the size and distribution of the eutectic Si. Acoustic cavitation caused by the ultrasound-activated impurities and the induced heterogeneous nucleation and supercooled nucleation in the groove melt was the main cause of the α-Al refinement, the eutectic Si modification and the improvement in the mechanical properties.

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“…The strengthening mechanism of the A356 alloy mainly includes fine grain strengthening, second phase strengthening and solution strengthening [ 35 , 36 , 37 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Song

Wang

et al. 2022

Materials

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“…Алюминиевые сплавы распространены и во многом незаменимы в авиационной и ракетнокосмической технике, поэтому проводится много исследований по разработке новых и совершенствованию существующих Al-сплавов [1][2][3][4][5][6].…”

Section: Introductionunclassified

Effect of hafnium on cast microstructure in alloy 1570

Zorin

Aryshenskii

Drits

et al. 2023

Izv.VUZ. Tsvet. Met.

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The issue is devoted to the study of the influence of hafnium on the structure and properties of alloy 1570. Ingots from alloy 1570 were cast into the steel coquille, including those with additives of hafnium 0.1, 0.2 and 0.5 %. To determine the size of the grain structure in the obtained ingots, an Axionovert-40 MAT optical microscope was used, chemical analysis of intermetallic particles was carried out using JEOL 6390A SEM. In addition, for the alloy 1570 and 1570–0.5Hf, the presence of nanoparticles with the L12 structure was studied using transmission electron microscope JEM-2100. Studies showed that hafnium additives make it possible to achieve a significant modification of the cast structure. For example, when introducing hafnium into the initial alloy in an amount of 0.5 % of the total weight, it was possible to achieve a reduction in the average grain size by 2 times. Scanning microscopy data showed that hafnium partially dissolves in particles containing scandium and zirconium as well. The addition of hafnium increases the number of large particles formed during crystallization. Transmission microscopy showed the presence of coherent aluminum matrix nanoparticles in alloy 1570 and having a superstructure of L12, which were most likely formed during intermittent decay during ingot cooling. When 0.5 % Hf was added, no nanoparticles with the L12 superstructure were detected. To explain the latter fact, it is necessary to study the surface of the liquidus of the Al–Hf–Sc system, as well as to study the effect of hafnium on the diffusion coefficient of scandium in aluminum.

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“…Design of new alloy systems that are compatible with the high impurities in the aluminum scraps is in urgent need [6,23]. Beyond the conventional aluminum alloy series, the Al-Ca alloys are found to have good castability and mechanical forming ability with unique properties [24][25][26][27][28]. Ca has a low density, and it is abundantly available.…”

Section: Introductionmentioning

confidence: 99%

Convert Harm into Benefit: The Role of the Al10CaFe2 Phase in Al-Ca Wrought Aluminum Alloys Having High Compatibility with Fe

Shen,

Zhang,

Liu

et al. 2023

Materials

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The compatibility of the wrought Al-Ca alloy with the element Fe was investigated in the present study. In this work, both the Al-Ca alloy and Al-Ca-Fe alloy were synthesized through melting, casting, heat treatment, and rolling. A new ternary Al-Ca-Fe eutectic phase, identified as Al10CaFe2 with an orthorhombic structure, demonstrated enhanced performance, as revealed by nanoindentation tests. Combining the results of the nanoindentation and EBSD, it can be inferred that during the rolling and heat treatment process, the divorced eutectic phases were broken and spheroidized, and the structure of the Fe-rich alloy became finer, which promotes the formation of fine grains during the process of dynamic recrystallization and effectively hindered the grain growth during thermal treatment. Consequently, the strength of the as-rolled Al-Ca alloy was improved with the addition of 1 wt.% Fe while the ductility of the alloy was maintained. Therefore, adding Ca into the high-Fe content recycled aluminum altered the form of the Fe-containing phases in the alloy, effectively expanding the application scope of recycled aluminum alloy manufacturing. This approach also offered a method for strengthening the Al-Ca aluminum alloys. Compared to the traditional approach of reducing Fe content in alloys through metallurgical means, this study opened a new avenue for designing novel, renewable aluminum alloys highly compatible with impurity iron in scrap.

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Ca-modified Al–Mg–Sc alloy with high strength at elevated temperatures due to a hierarchical microstructure

Cited by 18 publications

References 53 publications

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Effect of hafnium on cast microstructure in alloy 1570

Convert Harm into Benefit: The Role of the Al10CaFe2 Phase in Al-Ca Wrought Aluminum Alloys Having High Compatibility with Fe

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