Grain and dendrite refinement of A356 alloy with Al–Ti–C–RE master alloy

Zhao, Huijuan; Yue, Jin-sheng; Gao, Ya; Weng, Kangrong

doi:10.1007/s12598-013-0021-5

Cited by 32 publications

(13 citation statements)

References 17 publications

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“…By melts modifications with special compounds or elements, the microstructure can be greatly improved. For examples, the TiB 2 , TiC, Al 3 Sc, Al 3 Y, and Al 3 Er compounds serve as heterogeneous nucleation sites to facilitate the nucleation of α-Al crystals [3,6,11,13,30,31]; some active elements adsorbing on the surface of the primary α-Al dendrites advance their flourishing growth due to constitutional supercooling [8,32]. On the other hand, elements such as Sr, P, Na, and RE adsorb on the surface of the eutectic Si phases to inhibit the orientation growths along {200}, {110}, or {101} planes, resulting in short rods or even small granules [13,33,34].…”

Section: Discussionmentioning

confidence: 99%

Effects of Holmium Additions on Microstructure and Properties of A356 Aluminum Alloys

Wang

Shi

et al. 2018

Metals

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Sr-modification of A356 alloys has distinct shortages due to the volatilization and oxidation during remelting and pouring, which often reduce the modification efficiency and mechanical properties of the alloys. To avoid the adverse effects and enhance the comprehensive properties, the effects of heavy rare earth element holmium (Ho) modification on the microstructure and properties of the alloy were investigated. Ho addition inhibited the intrinsic orientation growth of (111)Al planes and stimulated the growth of the (200)Al planes for α-Al crystals. The addition of 0.2 wt.% Ho produced the best refinement effect for α-Al grains; 0.3 wt.% of Ho addition yielded the most distinct modification effect for eutectic Si phases, which was further improved by a T6 treatment. The extra addition of 0.4 wt.% Ho resulted in the complete loss of the refinement and modification effects and in the abnormal growth of the α-Al crystals. Ho additions produced Al3Ho phases containing Fe elements, which were distributed on the boundaries of the α-Al dendrites. The corrosion-proof performance was enhanced by Ho addition and the T6 treatment; the tensile strength and elongation achieved the highest value upon 0.2 wt.% of Ho addition and the T6 treatment. Moreover, the hardness was also enhanced by Ho additions in both states.

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Section: Discussionmentioning

confidence: 99%

Effects of Holmium Additions on Microstructure and Properties of A356 Aluminum Alloys

Wang

Shi

et al. 2018

Metals

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“…The affect of TiC together with Al 3 Ti granulation on the heterogeneous nucleation of α-Al pellet has been covered together with verified by other researchers [16][17][18]. It has been reported that Ti 2 A1 20 RE can not exist stably in the aluminum alloy melt [19,20], it will dissolve and provide a lot of RE for the aluminum melt [21]. A large number of research reports have confirmed that RE has a good modification effect on eutectic Si by forming nano rare earth phase [22] or inhibiting Si twin growth [23].…”

Section: Resultsmentioning

confidence: 69%

Effects of Al-5Ti-0.62C-1.07La intermediate alloy on the microstructure and mechanical properties of A356 aluminum alloy

Ding

Zhang

et al. 2020

Mater. Res. Express

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The physical characters that belong to hypo-eutectic Al-Si alloys are affected by certain important factors including the dimension, distribution together with structure of eutectic Si crystals together with primary α-Al. In this paper, A356-x Al-5Ti-0.62C-1.07La (x=0, 4, 5, 6, 7 wt%) alloys are was prepared by mechanical stirring. The effects of Al-5Ti-0.62C-1.07La intermediate alloy on the microstructures and mechanical properties of A356 alloy are investigated. Results show that the primary α-Al was significantly refined by Al-5Ti-0.62C-1.07La intermediate alloy. The secondary dendrite arm space (SDAS) of unrefined α-Al is approximately 40 μm. When the substance of Al-5Ti-0.62C-1.07La intermediate alloy is 6 wt%, SDAS declines to 10 μm. In addition, the component part of eutectic Si turns from thick acicular/schistose to short rod-like together with a section of pellets. Adding 6 wt% Al-5Ti-0.62C-1.07La intermediate alloy, A356-T6 alloy obtained the best tensile function and hardness. The ultimate tensile strength (UTS), elongation (El) together with Vickers hardness (HV) are 183.5 MPa, 8.2% and 62.3, which is increased by 30.3%, 95.2% and 38.1%, respectively. Furthermore, the variation in mechanical properties change with the development of micro-structure.

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“…Composites are formed by reinforcing the ceramic particles in the melt [7][8]. Through various research articles, it is illustrated that the improvement in mechanical properties is observed due to the reinforcing of various ceramic particles like Al2O3, SiC, B4C, TiC and TiB2 etc [9][10][11]. The traditional electromagnetic stir casting process is used to develop the aluminum metal matrix composite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Uncarbonized Eggshell Weight Percentage on Mechanical Properties of Composite Material Developed by Electromagnetic Stir Casting Technique

Dwivedi¹,

Maurya²,

Maurya³

2019

RCMA

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This study deals with the effect of uncarbonized eggshell weight percentage on the tensile strength of AA 2014 composite manufactured by Electromagnetic stir casting technique. Response surface methodology (RSM) is used to design the experiment. The selected process parameters are preheat temperature, stirring current, stirring time, matrix pouring temperature, and reinforcement of uncarbonized eggshell weight percentage. Analysis of variance (ANOVA) is employed to study the influence of selected process parameters. The maximum tensile strength of 287.194 MPa was achieved for reinforcement preheat temperature 537.87 °C, stirring current 12 A, stirring time 179.9 sec, matrix pouring temperature 726.8 °C, and reinforcement weight percentage of 12.46. At optimum level of process parameter confirmation tests are performed to validate the result. In confirmation test, tensile strength and hardness are investigated. It is observed that due to the reinforcement of uncarbonized eggshell in AA2014 aluminium alloy, tensile strength and hardness are improved by 55.24 % and 39.58 %.

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Grain and dendrite refinement of A356 alloy with Al–Ti–C–RE master alloy

Cited by 32 publications

References 17 publications

Effects of Holmium Additions on Microstructure and Properties of A356 Aluminum Alloys

Effects of Holmium Additions on Microstructure and Properties of A356 Aluminum Alloys

Effects of Al-5Ti-0.62C-1.07La intermediate alloy on the microstructure and mechanical properties of A356 aluminum alloy

Effect of Uncarbonized Eggshell Weight Percentage on Mechanical Properties of Composite Material Developed by Electromagnetic Stir Casting Technique

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