SHS-Produced Al–Ti–B Master Alloys: Performance in Commercial Al Alloy

Pourbagheri, H.; Aghajani, Hossein

doi:10.3103/s1061386218040052

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…The preparation methods of Al–Ti–B mainly include the halide salt route [ 11 , 12 ], the Ti-sponge route [ 13 ], the self-propagating high-temperature synthesis method [ 14 , 15 ], and the reprecipitated TiB 2 particles method [ 16 ]. The halide salt route and the Ti-sponge route are the primary methods for preparing.…”

Section: Introductionmentioning

confidence: 99%

Morphological Evolution of TiB2 and TiAl3 in Al–Ti–B Master Alloy Using Different Ti Adding Routes

Zhao

Li³

et al. 2022

Materials

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Three different Ti addition routes were used to prepare an Al–5Ti–B Master Alloy: the halide salt route, the Ti-sponge route, and the partial Ti-sponge route. In the halide salt route, the raw materials were Al + KBF4 + K2TiF6; K2TiF6 was completely replaced by pure titanium for the Ti-sponge route versus the halide salt route; in the partial Ti-sponge route, K2TiF6 was partially replaced by pure titanium. Here, 30% Ti-sponge or 60% Ti-sponge route means that 30% or 60% K2TiF6 was replaced by pure titanium, respectively. The above Ti addition routes have a significant influence on the growth pattern and morphological evolution of TiAl3 and TiB2, which greatly affect the refining performance of Al–Ti–B Master Alloy. When using the halide salt route, a streamlined “rich Ti, B area” exists in the aluminum melt, which is a complex compound of (Tix, Al1−x) By. The “rich Ti, B area” is essential for the nucleation and growth of TiAl3 and TiB2. Blocky TiAl3 was obtained and its average size was 4.7 μm based on the halide salt route. In the Ti-sponge route, the nucleation of TiAl3 mainly depends on the mutual diffusion of Al and Ti, and TiAlx forms around pure Ti particles, i.e., the so-called Ti–TiAlx mechanism. The average size of the blocky TiAl3 was 9.8 μm based on the Ti–TiAlx mechanism. For the partial Ti-sponge route, the “rich Ti, B area” gradually decreases with the increase in Ti powder’s contents, and large TiAl3 coexists with the small TiAl3. Compared with the Ti-sponge route, the halide salt route can form smaller TiAl3. In the Ti-sponge route, there is a small amount of “rich Ti, B area” due to the influence of the Ti–TiAlx mechanism, which does not meet the requirements of TiB2 growth. In the halide salt route, there is sufficient “rich Ti, B area”, which is conducive to the formation of TiB2. Both the crystal defects and the crowded growth environment caused by the “rich Ti, B area” are fundamental reasons for the fragility and the irregular shape of the TiB2. The refining effect of the Al–Ti–B Master Alloy prepared by the halide salt route is better than the Ti-sponge route. The refining effect of 30% Ti-sponge route is better than that of Ti-sponge route and worse than that of halide salt route.

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Section: Introductionmentioning

confidence: 99%

Morphological Evolution of TiB2 and TiAl3 in Al–Ti–B Master Alloy Using Different Ti Adding Routes

Zhao

Li³

et al. 2022

Materials

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“…In our previous works, studies had been made to determine phase formation in ternary systems of Cu-Ti-B [25], Al-Ti-B [26], and binary system of Ni-Ti [27] through the SHS route. This route is based on exothermic reactions and, by occurring the self-sustained reaction between the elemental powders; well-desired products could be obtained [20].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior, microstructure and phase formation of ternary Ni–Ti–Si nano composite synthesised by SHS method

et al. 2021

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In this paper, microstructure and phase formation of ternary Ni-Ti-Si nanocomposite synthesized by SHS method with the aim of preparing a precursor of high entropy alloys with bio application was investigated. X-ray diffractometer results show that solid solution, NiTiSi, including all three components was formed within the process. DTA results of mixed powders before synthesis showed that a transformation had happened at approximately 966oC which was related to the ternary solid solution formation. 1652 HV was achieved as the maximum microhardness value. The corrosion behavior of obtained nanocomposites was evaluated by the polarization test at the Zinger solution. The Bode phase diagrams obtained from EIS show that the influence of the porosity on corrosion behavior is higher than that of the phase formation. The best corrosion resistance of 0.06 ohm has been obtained in a sample with 33 wt% of nickel, 35 wt% of titanium, and 32 wt% of silicon.

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“…It is worth mentioning that improving the wear resistance of the materials with weak surface properties including magnesium [13], aluminum [14], titanium [15], and copper [16] attracts more attention among researchers. Among these materials, copper-based nanocomposites have significant application in automobile, bio, energy-saving, steel making, and petrochemical industries due to their exclusive properties like high thermal and electrical conductivity, but as mentioned before, their application is restricted due to the low wear resistance of the surface [17,18].…”

Section: Introductionmentioning

confidence: 99%

Wear behavior of self-propagating high-temperature synthesized Cu-TiO2 nanocomposites

et al. 2021

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In this paper, the copper-based nanocomposites with TiO2 nanoparticles were synthesized by the self-propagating high-temperature synthesis (SHS) process. The effect of the different amounts of excess copper, in comparison with the stoichiometric ratio (CuO:Ti ratios of 1:1, 2:1, and 3:1), on the phase formation of achieved samples was studied. A thermodynamical study showed that increasing the excess copper powder reduces the adiabatic temperature, which helps the phase formation. The maximum Brinell hardness (89) was obtained for the sample with the CuO:Ti ratio of 1:1. Finally, the wear behavior of the synthesized nanocomposites was evaluated by the pin on disk test, and the variation of friction coefficient and lost weight were measured. The friction coefficient decreased by the formation of phases and distribution of titanium oxide particles during the SHS process in the presence of the stoichiometric ratio of CuO:Ti. Therefore, the wear behavior was improved. The lowest depth of wear trace was measured 0.68 where the ratio of CuO: Ti was 1:1.

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SHS-Produced Al–Ti–B Master Alloys: Performance in Commercial Al Alloy

Cited by 7 publications

References 27 publications

Morphological Evolution of TiB2 and TiAl3 in Al–Ti–B Master Alloy Using Different Ti Adding Routes

Morphological Evolution of TiB2 and TiAl3 in Al–Ti–B Master Alloy Using Different Ti Adding Routes

Corrosion behavior, microstructure and phase formation of ternary Ni–Ti–Si nano composite synthesised by SHS method

Wear behavior of self-propagating high-temperature synthesized Cu-TiO2 nanocomposites

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