Influence of Combined Helical and Pass Rolling on Structure and Residual Porosity of an AA6082-0.2 wt % Al2O3 Composite Produced by Casting with Ultrasonic Processing

Naydenkin, E. V.; Мишин, И. П.; Khrustalyov, Anton; Vorozhtsov, S. A.; Vorozhtsov, Alexander

doi:10.3390/met7120544

Cited by 8 publications

(9 citation statements)

References 23 publications

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“…Al 3 Ti and TiC can act as heterogeneous nuclei of Al [13,14]. Al 2 O 3 , which is distributed in the solid-liquid interface, can inhibit grain growth, which has been proven in references [15,16]. However, an Al-TiO 2 -C system has rarely been used as a refiner.…”

Section: Introductionmentioning

confidence: 99%

Effect of La2O3 on the Microstructure and Grain Refining Effect of Novel Al-TiO2-C-XLa2O3 Refiners

Liu

Zhang

Yan

et al. 2020

Metals

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New aluminum grain refiners, Al-TiO 2 -C-XLa 2 O 3 refiners, were manufactured by the in situ reaction of Al powder, TiO 2 powder, C powder, and La 2 O 3 powder. The effects of La 2 O 3 on the refiners' microstructure and the grain refining effect of the Al-TiO 2 -C-XLa 2 O 3 refiners on industrial aluminum were studied. The effect of the sintering process was also studied. The results show that the refiners contain Al 3 Ti, TiC, Al 2 O 3 , AlN, and Al 20 Ti 2 La. As the content of La 2 O 3 increases, the amount of Al 20 Ti 2 La also increases. However, the amounts of Al 3 Ti, Al 2 O 3, and TiC decrease. Al 3 Ti is a lath-like compound whose size becomes smaller. The distribution of Al 2 O 3 and TiC, however, is more uniform. The Al-TiO 2 -C-0.2La 2 O 3 refiner has the best grain refining effect on industrial aluminum. The size of the industrial aluminum refined by the Al-TiO 2 -C-0.2La 2 O 3 refiner is 320 µm; the refiner's grain size is 8.4% that of the industrial aluminum without refiners 0 µm (380). After adding the novel Al-TiO 2 -C-0.2La 2 O 3 refiner, the nucleation temperature T N reached 679.21 • C, which is 17 • C above the nucleation temperature of the industrial aluminum without refiners. The primary transformation time is the longest at 25.5 s, which is 4.6 s higher than that of industrial aluminum (20.9 s). Furthermore, the ∆T of the aluminum is 0.5 • C, which is the lowest value.Many researchers have refined aluminum alloys by adding rare earth (RE) [17,18]. Zhang et al. discovered that a Al-Ti-C-Ce master alloy can refine industrial aluminum effectively [19]. Shi et al. proved that erbium (Er) can refine Al-Si-Mg alloys [20]. However, studies on RE oxides have mostly focused on the preparation of catalysts and glasses [21,22], but the application of RE oxides in the synthesis of Al-TiO 2 -C grain refiners has been less researched.Computer-aided cooling curve analysis (CA-CCA) is often used to characterize the solidification parameters of metals during solidification. Due to its ease of use and low cost, it is the most popular thermal analysis technique [23][24][25]. Farahany et al. used CA-CCA to study the grain refining effect of Sb, Bi, and other elements on Al-Si alloys [26]. Osvaldo et al. studied the solidification process of Al-Cu alloy by CA-CCA [27]. In this paper, novel Al-TiO 2 -C-XLa 2 O 3 refiners were prepared via an in-situ reaction (where X is the weight fraction of La 2 O 3 , equal to 0, 0.1, 0.2, 0.3, and 0.4, as used in this study). The influence of La 2 O 3 on the microstructures of refiners was analyzed. Then, adding different refiners to industrial aluminum, the grain refining effect of refiners on industrial aluminum was studied by CA-CCA. The influence of La 2 O 3 in the sintering process is also discussed. Materials and MethodsIn this experiment, La 2 O 3 powder (purity 99.9%, particle size 5 µm, Baotou Research Institute of Rare Earths, Baotou, China), Al powder (purity 99.9%, particle size 40-50 µm, Beijing General Research Institute of Nonferrous Metals, Beijing, China),...

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Section: Introductionmentioning

confidence: 99%

Effect of La2O3 on the Microstructure and Grain Refining Effect of Novel Al-TiO2-C-XLa2O3 Refiners

Liu

Zhang

Yan

et al. 2020

Metals

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“…In this case, composite material properties will be determined by the type and amount of the particles introduced. The results obtained [9][10][11][12][13][14] allow us to assert that MMNCs based on aluminum and with nanoparticles introduced into them have higher performance characteristics, in particular, ultimate strength, yield strength, plasticity, hardness, heat resistance, etc. [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of structure, mechanical properties and crystallization of aluminum alloys containing aluminum oxide nanoparticles

et al. 2018

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“…At present, metal-matrix composites (MMC), based on aluminum hardened by nonmetallic particles, are of great interest in different branches of technology owing to high specific strength, hardness, wear resistance, etc. [1][2][3]. Casting is one of the most universal methods of manufacture of such materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of scandium fluoride on the structure and phase composition of Al-Si alloy

et al. 2018

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Influence of Combined Helical and Pass Rolling on Structure and Residual Porosity of an AA6082-0.2 wt % Al2O3 Composite Produced by Casting with Ultrasonic Processing

Cited by 8 publications

References 23 publications

Effect of La2O3 on the Microstructure and Grain Refining Effect of Novel Al-TiO2-C-XLa2O3 Refiners

Effect of La2O3 on the Microstructure and Grain Refining Effect of Novel Al-TiO2-C-XLa2O3 Refiners

Investigation of structure, mechanical properties and crystallization of aluminum alloys containing aluminum oxide nanoparticles

Influence of scandium fluoride on the structure and phase composition of Al-Si alloy

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