Development of Al-Ti-C grain refiners containing TiC

Banerji, A.; Reif, W.

doi:10.1007/bf02645911

Cited by 157 publications

(62 citation statements)

References 15 publications

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“…Fading time in this investigation is because of high temperature in producing master alloy step and coarse TiAl 3 particles. This has been previously reported [20].…”

Section: Resultssupporting

confidence: 74%

Investigation on Microstructure and Grain Refining Performance of a New Type of Al-3Ti-1C Master Alloy

Hassanbeygi¹,

Shafyei²

2014

OJMetal

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Grain refining process plays a significant role in preventing columnar and coarse grains and it encourages fine grain formation. Although Al-Ti-B master alloys use widely as aluminium grain refiners, there are several problems in their applications. So, this kind of master alloys use less than last. Because of great properties of Al-Ti-C refiners, they can be considered as suitable candidates for use instead of Al-Ti-B master alloys. In recent years, Al-Ti-C refiners have attracted huge attention among researchers. In this paper, Al-3Ti-1C master alloy is prepared with a melting reaction method. This method involves adding graphite powder and fine titanium particles into superheated pure aluminium. Then microstructure of this master alloy is studied by scanning electron microscope (SEM) and its phases are distinguished by energy dispersive spectroscopy (EDS). In the next part, 200 ppm of Al-3Ti-1C master alloy is added to pure aluminium and its refining efficiency is compared with the condition in which TiC powders are added to aluminium melt directly. It is found that the fading time for both Al-3Ti-1C and TiC powder is about 15 minutes and in overall, grain refining efficiency of Al-3Ti-1C is more than TiC powders in 60 minutes.

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“…Fading time in this investigation is because of high temperature in producing master alloy step and coarse TiAl 3 particles. This has been previously reported [20].…”

Section: Resultssupporting

confidence: 74%

Investigation on Microstructure and Grain Refining Performance of a New Type of Al-3Ti-1C Master Alloy

Hassanbeygi¹,

Shafyei²

2014

OJMetal

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“…It can be seen that, before the addition of The research by Barerji and Reif at the University of Berlin, Germany indicates that, since TiAl 3 is thermodynamically unstable, it will be dissolved in aluminum liquid at a rate of 40 µm/min. Due to the high melting point of TiC, it can be kept stable in molten aluminum and function as a nucleating agent [21]. The modification mechanism of Si in Al-8Si alloy modified with Al-Ti-C-Ce master alloy is mainly investigated from the perspective of twin geometric growth [22].…”

Section: The Effect Of Al-5ti-062c-02ce Master Alloy On Microstructmentioning

confidence: 99%

Effect of Al-5Ti-0.62C-0.2Ce Master Alloy on the Microstructure and Tensile Properties of Commercial Pure Al and Hypoeutectic Al-8Si Alloy

Ding

Zhang

et al. 2017

Metals

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Al-5Ti-0.62C-0.2Ce master alloy was synthesized by a method of thermal explosion reaction in pure molten aluminum and used to modify commercial pure Al and hypoeutectic Al-8Si alloy. The microstructure and tensile properties of commercial pure Al and hypoeutectic Al-8Si alloy with different additions of Al-5Ti-0.62C-0.2Ce master alloy were investigated. The results show that the Al-5Ti-0.62C-0.2Ce alloy was composed of α-Al, granular TiC, lump-like TiAl3 and block-like Ti2Al20Ce. Al-5Ti-0.62C-0.2Ce master alloy (0.3 wt %, 5 min) can significantly refine macro grains of commercial pure Al into tiny equiaxed grains. The Al-5Ti-0.62C-0.2Ce master alloy (0.3 wt %, 30 min) still has a good refinement effect. The tensile strength and elongation of commercial pure Al modified by the Al-5Ti-0.62C-0.2Ce master alloy (0.3 wt %, 5 min) increased by roughly 19.26% and 61.83%, respectively. Al-5Ti-0.62C-0.2Ce master alloy (1.5 wt %, 10 min) can significantly refine both α-Al grains and eutectic Si of hypoeutectic Al-8Si alloy. The dendritic α-Al grains were significantly refined to tiny equiaxed grains. The morphology of the eutectic Si crystals was significantly refined from coarse needle-shape or lath-shape to short rod-like or grain-like eutectic Si. The tensile strength and elongation of hypoeutectic Al-8Si alloy modified by the Al-5Ti-0.62C-0.2Ce master alloy (1.5 wt %, 10 min) increased by roughly 20.53% and 50%, respectively. The change in mechanical properties corresponds to evolution of the microstructure.

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“…Aluminium additions during processing of cast iron improve its oxidation and corrosion resistance [1][2][3][4][5][6][7][8][9]. Nevertheless, the apparent benefits of aluminium in cast irons can be upset by the crystallization of Al 4 C 3 precipitates, which are highly undesirable.…”

Section: Introductionmentioning

confidence: 99%

“…These carbides are hydrophilic compounds, which lead to drastic reductions in the mechanical properties and to material selfdestruction as a result of appreciable swelling. The extent of swelling is related to a net volume increase, which accompanies the carbide reaction with water as [1][2][5][6][7][8][9]: Al 4 C 3 + 12H 2 O→ 4Al(OH) 3 …”

Section: Introductionmentioning

confidence: 99%

Effect of Ti, Nb, Cr and B on Structure and Mechanical Properties of High Aluminium Cast Iron

Kopyciński¹

2013

Archives of Foundry Engineering

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In this work, a method was investigated to eliminate the presence of undesirable Al 4 C 3 phases in a high-aluminium alloys, and thus improve the production process. The melting conditions employed in this work enabled the formation of a Fe-Al-C liquid solution. Moreover, titanium additions into the liquid allowed the precipitation of TiC. According to this reaction, the extent of carbon removal from the melt is strongly influenced by the amount of Ti additions. Hence, proper titanium levels can result in total removal of carbon from the liquid. Notice from this figure that Ti additions above 4.5%, totally eliminate the undesirable Al 4 C 3 precipitates. Making Cr, Ti, B additions reduces size of FeAl alloys grains. In addition, this work indicates that the high-aluminium cast iron posses high oxidation resistance, exceeding that of high-chromium cast iron and chromium cast steels. Finally, the alloy ductility can be enhanced by additions of dopants such as B and Cr. Hence, additions of 0.03% B and 0.03%B-5% Cr combined with a heat treatment were implemented. As a result, the alloy ductility was significantly improved, where the strain of up to 5.3%, (B alone) or 15% (B-Cr) were obtained.

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Development of Al-Ti-C grain refiners containing TiC

Cited by 157 publications

References 15 publications

Investigation on Microstructure and Grain Refining Performance of a New Type of Al-3Ti-1C Master Alloy

Investigation on Microstructure and Grain Refining Performance of a New Type of Al-3Ti-1C Master Alloy

Effect of Al-5Ti-0.62C-0.2Ce Master Alloy on the Microstructure and Tensile Properties of Commercial Pure Al and Hypoeutectic Al-8Si Alloy

Effect of Ti, Nb, Cr and B on Structure and Mechanical Properties of High Aluminium Cast Iron

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