Microstructure and mechanical properties of as-cast and T6 treated Sc modified A356-5TiB2 in-situ composite

Pramod, S.; Ravikirana, .; Rao, A.K. Prasada; Murty, B.S.; Bakshi, Srinivasa Rao

doi:10.1016/j.msea.2018.10.080

Cited by 30 publications

(6 citation statements)

References 27 publications

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“…Hou [36] researched that when the in-situ reaction of the aluminum melt occurs to prepare Al-Ti-C by quenching experiment, the local temperature will reach about 1600 K, which is consistent with the theoretical thermodynamic data in previous research. In other words, Equation 2can promote the occurrence of Equations 7and (8). However, the solubility of C in liquid Al is very low.…”

Section: Phase Transformation and Microstructure Transformation Of Almentioning

confidence: 99%

“…Nowadays, with the development of the industry, it is urgent to improve multi-properties for aluminum alloys [4,5]. Numerous studies have showed that the grain refining plays an important role in improving the properties of aluminum alloys [6][7][8]. Since Cibula [9] proposed the Carbide boride theory, tremendous efforts have been devoted to investigating the grain refining for aluminum alloy, including Al-Ti, Al-B, Al-C, Al-P, Al-Ti-B, Al-Ti-B-C, and Al-Ti-C master alloys [5,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Microstructure of Al-5Ti-0.62C System and Synthesis Mechanism of TiC

et al. 2020

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Al-Ti-C master alloys have been widely investigated by various researchers. However, their refining effectiveness is still severely compromised by the preparation process. In this work, the aluminum melt in-situ reaction was carried out to synthesize the Al-5Ti-0.62C, and its refining performance was estimated. The thermodynamics calculation and differential scanning calorimeter experiment were used to investigate the synthesis mechanism of TiC. Quenching experiment was conducted to explore phase and microstructure transformation of the Al-5Ti-0.62C system. The results show that the main phases of Al-5Ti-0.62C master alloys are α-Al, Al3Ti, and TiC and it has a positive effect on commercial pure aluminum refining. Commercial pure aluminum is completely refined into the fine equiaxed structure by adding 0.3% Al-5Ti-0.62C master alloy. TiC particles mainly distribute in the grain interior and grain boundaries. The excess Ti came from the dissolution of Al3Ti spreading around TiC and finally forming the Ti-rich zone to promote the nucleation of α-Al. The experiments certified that TiC was formed by the reaction between solid C and excess Ti atoms. The main reactions in the Al-5Ti-0.62C system were that solid Al is transferred into liquid Al, and then liquid Al reacted with solid Ti to form the Al3Ti. At last, the release of a lot of heat promotes the formation of TiC which formed by the Ti atoms and solid C.

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Section: Phase Transformation and Microstructure Transformation Of Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Microstructure of Al-5Ti-0.62C System and Synthesis Mechanism of TiC

et al. 2020

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“…Recently, research on A356 is focused on performance improvements via multi-element microalloying and the subsequent heat treatment processes [4][5][6][7][8]. Meanwhile, rare earth elements, such as erbium, lanthanum, scandium, cerium, and europium, have been studied extensively [9][10][11][12][13]. These elements are chemically very active, and by doping them into the aluminum alloy, alloy purification, degass-ing, grain refinements, and mitigation of harmful effects from impurities could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

Ling

Shi

et al. 2022

Materialwissenschaft Werkst

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The effect of the addition of chromium between 0.1 % and 0.3 % on the structure and properties of Al-7Si-0.35Mg-0.02Sr alloy was studied. The results show that as the chromium content increases, the alloy grains are refined, and the grains appear fine equiaxed after 0.2 % chromium addition. At the same time, chromium combines with iron to form AlCrFeSi phase, which significantly improves the iron phase morphology, making it change from needle shape to fish bone shape. In the aging stage, the Al 13 Cr 4 Si 4 phase is dispersed in the alloy, and its phase relationship with the matrix is semi-coherent and non-coherent. When the chromium content continues to increase, the degree of dispersion of the Al 13 Cr 4 Si 4 phase is higher, but the performance of the alloy decreases, because the chromium containing precipitate phase consumes magnesium and silicon solute atoms from the nearby melt, making the amount of magnesium silicide decrease. The Al-7Si-0.35Mg-0.02Sr alloy with 0.2 % chromium showed the best mechanical properties (ultimate tensile strength, yield strength, elongation and hardness).

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“…Chemical modifiers are master alloys including Sr, sodium (Na), barium (Ba), calcium (Ca) and europium (Eu) elements used to obtain eutectic modification which avoids eutectic Si growth by the mechanism of impurity induced twinning (IIT) growth and twin plane re-entrant (TPRE) poisoning [2][3][4]. Besides that ability, Sr melt treatment increases the H concentration in the melt.…”

Section: Introductionmentioning

confidence: 99%

Determination Of The Effect Of Cooling Rate And Strontium Amount On Eutectic Si Modification Performance Of A356 Alloy Via Casting Simulation

Dogdu¹,

Ertuğrul

Aybarç³

et al. 2021

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

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It is well-known that strontium addition into molten metal as a eutectic modifier increases the elongation and toughness values of the cast parts by refining the eutectic phases. However, when over-modification occurs, porosity increases due to some unwanted physical and chemical reactions that develop within the structure. On the other hand, it has been seen that high cooling rates tend to reduce the porosity of the alloy, decrease grain size and secondary dendrite arm spacing and refine eutectic silicon phase on Al-Si casting alloys. Within the scope of this research, it is aimed to investigate the effects of the cooling rate of cast part and the addition amount of strontium on the silicon modification behavior of Al A356 (AlSi7Mg) alloy parts using casting simulation environment. To examine the effect of strontium amount, 150, 250, 350 and 450 parts per million of strontium additions were selected in accordance with the aluminum wheel production limits that given by OEM customers. After the casting session of each Al A356 composition with different strontium amount by using special designed 5-spoke mold on casting simulation, thermal analysis was done by obtained thermocouple data from casting part's each spoke. Obtained thermal analysis data was interpreted with the casting simulation outputs. Within all aspects, the 150 parts per million strontium addition on Al A356 alloy have been identified as the most useful simulation model in terms of casting performance.

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Microstructure and mechanical properties of as-cast and T6 treated Sc modified A356-5TiB2 in-situ composite

Cited by 30 publications

References 27 publications

Investigation of Microstructure of Al-5Ti-0.62C System and Synthesis Mechanism of TiC

Investigation of Microstructure of Al-5Ti-0.62C System and Synthesis Mechanism of TiC

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

Determination Of The Effect Of Cooling Rate And Strontium Amount On Eutectic Si Modification Performance Of A356 Alloy Via Casting Simulation

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