The Microstructure and Solidification Mechanism of Al-Ti-C-Ce Prepared by Petroleum Coke

Zhou, Xin; He, Yong; Zhang, Yuan Qing; Dong, Li Min

doi:10.4028/www.scientific.net/msf.960.14

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…The Al-TiO 2 -C system is one of the most common composites and can produce Al 3 Ti, TiC, and Al 2 O 3 in the system [11,12]. 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].…”

Section: Introductionmentioning

confidence: 94%

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: 94%

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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“…However, many defects have been found in the application of Al-Ti-B master alloy thus limiting its development, i.e., a larger aggregation tendency of TiB 2 in the melt, large size, and the possibility of Zr and Si poisoning [4,5]. In order to obtain a good refining efficiency, a series of novel master alloys have emerged, such as Al-Ti-C, Al-Ti-B-C and Al-Ti-C/B-RE master alloy [6][7][8][9]. Al-Ti-C master alloy especially has been extensively studied by researchers, and it has been found that it can be remedy certain defects of Al-Ti-B master alloy [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of CeO2 Size on Microstructure, Synthesis Mechanism and Refining Performance of Al-Ti-C Alloy

Chen

Gou

et al. 2021

Materials

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The effects of CeO2 size on the microstructure and synthesis mechanism of Al-Ti-C alloy were investigated using a quenching experiment method. A scanning calorimetry experiment was used to investigate the synthesis mechanism of TiC, the aluminum melt in situ reaction was carried out to synthesize master alloys and its refining performance was estimated. The results show that the Al-Ti-C-Ce system is mainly composed of α-Al, Al3Ti, TiC and Ti2Al20Ce. The addition of CeO2 obviously speeds up the progress of the reaction, reduces the size of Al3Ti and TiC and lowers the formation temperature of second-phase particles. When the size of CeO2 is 2–4 μm, the promotion effect on the system is most obvious. The smaller the size of CeO2, the smaller the size of Al3Ti and TiC and the lower the formation temperature. Al-Ti-C-Ce master alloy has a significant refinement effect on commercial pure aluminum. When the CeO2 size is 2–4 μm, the grain size of commercial pure aluminum is refined to 227 μm by Al-Ti-C-Ce master alloy.

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The Microstructure and Solidification Mechanism of Al-Ti-C-Ce Prepared by Petroleum Coke

Cited by 2 publications

References 10 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

Effect of CeO2 Size on Microstructure, Synthesis Mechanism and Refining Performance of Al-Ti-C Alloy

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