The effect of the flake to fiber transition in silicon morphology on the tensile properties of Al–Si eutectic alloys

Hosch, T.; Napolitano, Ralph E.

doi:10.1016/j.msea.2010.09.008

Cited by 87 publications

(31 citation statements)

References 38 publications

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“…14 Fig. 15 for r UTS is in good agreement with the values of 0.12, 0.08, and 0.14 obtained by Bromley et al [37] for Sn-3.5wt%Ag alloy, by Hosch and Napolitano [5] for Al-12wt%Si eutectic alloy, and by Hu et al [27] for Sn-1.0wt%Cu eutectic alloy, respectively. The exponent value (0.24) of k obtained from Fig.…”

Section: The Effect Of Microstructure and Solidification Parameters Osupporting

confidence: 87%

“…The change in the lamellar spacing depends on the different solidification parameters (temperature gradient, growth rate, and cooling rate) plays a vital role in the mechanical properties of the materials. Many studies performed on the improvement of the mechanical properties by finer lamellar structures are reported in the literature [1][2][3][4][5][6][7][8]. Recently, some studies have concentrated on the ternary and multicomponent alloy systems [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a Directionally Solidified Sn–Pb–Sb Ternary Eutectic Alloy

Çadırlı

Şahin

Turgut

2015

Metallogr. Microstruct. Anal.

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A Sn-40.5wt%Pb-2.6wt%Sb ternary eutectic alloy was prepared using a vacuum melting furnace and a casting furnace. The samples were directionally solidified at a constant growth rate (V = 16.5 lm/s) under different temperature gradients (G = 1.05-3.88 K/mm) and at a constant temperature gradient (G = 3.88 K/mm) under different growth rates (V = 8.3-498 lm/s). The effects of G and V on lamellar spacing (k), microhardness (HV), and ultimate tensile strength (r) were determined. The lamellar spacing and microhardness were measured from both longitudinal and transverse sections of the sample. The relationships between solidification parameters (G, V), microstructure parameters (k L , k T ), and mechanical properties (HV, r) were determined from linear regression analysis. It was found that the microhardness and tensile strength increase with increasing G and V as well as with decreasing k.

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Section: The Effect Of Microstructure and Solidification Parameters Osupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Characterization of a Directionally Solidified Sn–Pb–Sb Ternary Eutectic Alloy

Çadırlı

Şahin

Turgut

2015

Metallogr. Microstruct. Anal.

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“…The features, such as grain size, secondary dendritic arm spacing, precipitates, and phase fraction, are dependent on differential rates of cooling, caused by differences in section thickness of the cast part. Therefore, the relationship between the changes in microstructures and mechanical prop-erties of the alloy are an important consideration in order to understand and predict the behavior of the materials [3][4][5][6] .…”

Section: Introductionmentioning

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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“…The brittleness of the coarse and faceted Si crystals in untreated Al-Si eutectics is the main reason for its poor mechanical properties, such as premature crack initiation and fracture in tension. [8][9][10] However, to our advantage, the growth mechanism of the faceted phase is fairly complex, and thus its microstructure (as well as that of the overall eutectic) can be influenced in various ways. One option is to tune the solidification parameters, e.g., growth velocity and thermal gradient, in directional experiments.…”

Section: B Modification Of Degenerate Eutecticsmentioning

confidence: 99%