Effect of Sc addition and T6 aging treatment on the microstructure modification and mechanical properties of A356 alloy

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

doi:10.1016/j.msea.2016.08.022

Cited by 71 publications

(24 citation statements)

References 35 publications

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“…The smaller the SDAS, the smaller the repulsion stress felt by a dendrite boundary dislocation and the higher the applied stress needed to propagate dislocations through the material. Many investigators have found that the cooling rate determines the SDAS and it affects signi cantly the mechanical properties of Al-Si (A356/357) alloys because the structure directly controls the size and distribution of eutectic silicon phase 2,14,15) . Likewise, it is con rmed in this study that the SDAS of primary α-aluminum gets smaller as the cooling rate increases, which increases the mechanical properties of AA365 in terms of strength.…”

Section: Resultsmentioning

confidence: 99%

Effect of Solidification Cooling Rate on Mechanical Properties and Microstructure of Al-Si-Mn-Mg Alloy

Lee

Mishra

2017

Mater. Trans.

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Al-Si-Mn-Mg alloy, AA365 (Silafont-36), has been recently developed for automotive parts produced by the high-pressure die-casting process. During the die-casting process, differences in section thickness cause uneven cooling, which results in different mechanical properties and cause the build-up of residual stresses and defects in the part. In the present study, we have attempted to identify the microstructural changes of α-aluminum dendritic phase and eutectic region, and the mechanical property changes in AA365 alloy at different cooling rates during solidi cation. The alloy cooled at 9000 K/min (water quenching) acquired a secondary dendrite arm spacing (SDAS) of 3.4 µm and contained over 75% of dendritic α-aluminum phase, whereas the alloy having a cooling rate of 77 K/min (air cooling) showed 12 µm SDAS and 65.5% of α-aluminum phase. The ultimate tensile stress and the elongation of AA365 cooled at 9000 K/min went up to 262.3 MPa and 4.4%, respectively, when compared with the alloy cooled at 77 K/min, which had 192.3 MPa tensile strength and an elongation of 2.9%. The water quenching increases the hardness of dendritic α-aluminum phase by about 130% compared to that of the air-cooling, and it was conrmed that the fast cooling rate could increase the solubility of the elements that can be dissolved in the α-aluminum phase. The hardness of the alloy increased with an increase in the cooling rate during solidi cation due to uniform and ne size of the silicon bearing intermetallic phases in the eutectic region, caused by fast solidi cation.

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Section: Resultsmentioning

confidence: 99%

Effect of Solidification Cooling Rate on Mechanical Properties and Microstructure of Al-Si-Mn-Mg Alloy

Lee

Mishra

2017

Mater. Trans.

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“…Friction stir process after in situ synthesis of A356/Al 3 Ti composites has refined the size of Al 3 Ti compound and reduced the porosity of the composites [18]. Strontium (Sr) [13], Scandium (Sc) [19], Lanthanum (La) [20] and Titanium (Ti) are identified as efficient matrix grain refinement agents during in situ synthesis process. The addition of small amount of above said elements has reduced the size of SDAS and modified the Si phase in the matrix and enhanced the tensile strength, yield strength and ductility.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructure of A356 alloy reinforced AlN/MWCNT/graphite/Al composites fabricated by stir casting

Logesh

Hariharasakthisudhan²,

Moshi³

et al. 2019

Mater. Res. Express

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In this experimental research work, the metal matrix composites of A356 alloy were prepared by reinforcing different shaped particles Aluminium Nitride (AlN), Multi-Walled Carbon Nano Tube (MWCNT) and graphite (Gr). The main objective of this research work was to investigate the influence of different shaped reinforcement in the microstructure and mechanical behaviour of composites. The reinforcements (AlN & MWCNT) were added as 0.5, 0.75, 1 and 2 vol% and the graphite was maintained in 0.5 vol%. The composites were fabricated using stir casting followed by ultrasonic vibration treatment. The tensile, compression and Brinell hardness test were carried out by following ASTM standards. The characterization of reinforcements, castings and fractured surfaces was performed using Optical Microscope (OM) and Scanning Electron Microscope (SEM). The mechanical tests and characterization results revealed that there was a significant influence of morphology of reinforcements on mechanical properties of the materials. Particle strengthening and grain refinement strengthening were found to be operative in the composites. The SEM micrograph of fractured surface of composites with MWCNT exhibited the crack bridging effect as strengthening mechanism apart from particle strengthening. The porosity and cluster of reinforcements were observed in the composites with MWCNT more than 1 vol% of and AlN 0.75 vol%.

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“…For each sample, measurements were taken from the whole sectioned area with 300–500 grains per sample. Average shape factor ( F ) and circular diameter ( D ) of primary α ‐Al particles were calculated by the following equations:

D = \sqrt{\frac{4 A}{π}}

F = \frac{4 π A}{P^{2}}

…”

Section: Methodsmentioning

confidence: 99%

Effect of Erbium on the Microstructure and Mechanical Properties of Semi‐Solid Al–7Si–0.4Mg Alloy

Wang

et al. 2018

Adv Eng Mater

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In this paper, semi-solid Al-7Si-0.4Mg-x erbium(Er) (x ¼ 0, 0.1, 0.3, 0.5, 0.8 wt%) alloys are fabricated via electromagnetic stirring method. The effects of Er on the microstructures and mechanical properties of semi-solid Al-7Si-0.4Mg alloys are investigated. Results show that the eutectic π-phase is modified to fine sized Er-poor π-phase and primary α-Al is refined in semisolid Al-7Si-0.4Mg alloys with the addition of Er. Meanwhile, the plate-like shape eutectic Si is transformed into fibrous eutectic Si with addition of Er, which has an excellent modification effect on the eutectic Si. Nucleation rate of the Er-poor π-phase is increased with a higher super cooling rate, which causes the refinement of primary α-Al and the modification of eutectic Si phase. With the addition of 0.3 wt% Er, semi-solid Al-7Si-0.4Mg alloys obtain the best tensile properties. The ultimate tensile strength and elongation values are 228 MPa and 10.4%, which is increased by 7% and 50% than Erfree alloy, respectively.Al-7Si-0.4Mg casting alloy is widely used in the auto-motive industry because of the good specific mechanical properties. Semisolid metal processing (SSM) is widely used in Al alloys due to the spherical primary α-Al grain structure. [1][2][3] Zhang et al. [4]

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Effect of Sc addition and T6 aging treatment on the microstructure modification and mechanical properties of A356 alloy

Cited by 71 publications

References 35 publications

Effect of Solidification Cooling Rate on Mechanical Properties and Microstructure of Al-Si-Mn-Mg Alloy

Effect of Solidification Cooling Rate on Mechanical Properties and Microstructure of Al-Si-Mn-Mg Alloy

Mechanical properties and microstructure of A356 alloy reinforced AlN/MWCNT/graphite/Al composites fabricated by stir casting

Effect of Erbium on the Microstructure and Mechanical Properties of Semi‐Solid Al–7Si–0.4Mg Alloy

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