Dendritic Growth, Solidification Thermal Parameters, and Mg Content Affecting the Tensile Properties of Al-Mg-1.5 Wt Pct Fe Alloys

Gomes, Leonardo Fernandes; Silva, Bismarck Luiz; Garcia, Amauri; Spinelli, José Eduardo

doi:10.1007/s11661-017-3978-0

Cited by 23 publications

(12 citation statements)

References 32 publications

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“…Most studies on DS involving transient heat flow conditions have been carried out considering vertical upward solidification conditions (with melt on top of the solid), which is both thermally and solutally stable for alloys in which the rejected element at the solidification front induces a local liquid that is denser than the melt [19][20][21][22][23]. During horizontal growth, however, both thermal and composition gradients may occur in the melt bath resulting in quite complex movements by convection within the fluid.…”

Section: Introductionmentioning

confidence: 99%

Horizontally Solidified Al–3 wt%Cu–(0.5 wt%Mg) Alloys: Tailoring Thermal Parameters, Microstructure, Microhardness, and Corrosion Behavior

Barros

Cruz

Silva

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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In the present experimental investigation, Al-3 wt%Cu and Al-3 wt%Cu-0.5 wt%Mg alloys castings are produced by a horizontal solidification technique with a view to examining the interrelationship among growth rate (G R ), cooling rate (C R ), secondary dendrite arm spacing (k 2 ), Vickers microhardness (HV), and corrosion behavior in a 0.5 M NaCl solution. The intermetallic phases of the as-solidified microstructures, that is, h-Al 2 Cu, S-Al 2 CuMg, and x-Al 7 Cu 2 Fe, are subjected to a comprehensive characterization by using calculations provided by computational thermodynamics software, optical microscopy, and scanning electron microscopy/energy-dispersive spectroscopy. Moreover, electrochemical impedance spectroscopy and potentiodynamic polarization tests have been applied to analyze the corrosion performance of samples of both alloys castings. Hall-Petch-type equations are proposed to represent the HV dependence on k 2 . It is shown that the addition of Mg to the Al-Cu alloy has led to a considerable increase in HV; however, the Al-Cu binary alloy is shown to have lower corrosion current density (i corr ) as well as higher polarization resistance as compared to the corresponding results of the Al-Cu-Mg ternary alloy.

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Section: Introductionmentioning

confidence: 99%

Horizontally Solidified Al–3 wt%Cu–(0.5 wt%Mg) Alloys: Tailoring Thermal Parameters, Microstructure, Microhardness, and Corrosion Behavior

Barros

Cruz

Silva

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…A -1.1 power law characterizes the experimental variations of λ 2 with V L while a 1/3 exponent is capable to represent the variations found for λ 2 with t SL . A -1.1 exponent was also shown to be appropriate in the power function equation relating λ 2 to the V L obtained for the ternary Al-1.2wt%Mg-1.5wt.%Fe and Al-7.0wt%Mg- 1.5wt%Fe alloys 17 . In this case, the single power function λ 2 =22(V L ) -1.1 has been proposed for both alloys.…”

Section: Microstructure and Solidification Thermal Variablesmentioning

confidence: 87%

“…Other research works dealing with Al-Mg alloys may be cited in the present context. For example, Gomes et al 17 investigated the dendritic morphology and tensile properties of the Al-1.2 wt pct Mg-1.5 wt pct Fe and Al-7 wt pct Mg-1.5 wt pct Fe alloys. Experimental plots of secondary dendrite arm spacings with cooling rate and of tensile properties with λ 2 were proposed.…”

Section: Introductionmentioning

confidence: 99%

Length Scale of the Dendritic Array Tailoring Strength of a 5052 Aluminum Alloy

et al. 2018

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The present research aims to characterize 5xxx alloy series, considering chemistries based on the commercial 5052 alloy with three Mg contents (2.4wt.%, 2.6wt.% and 3.2wt.%) through transient directional solidification experiments. Very representative incoming impurities to a given twin-roll casting procedure were reached. As such, the Si, Fe, Cu, Mn and Cr-contents in the tested samples typically trend in between the suitable alloying spectrum. Microstructural analyzes were performed using polarized light microscopy of samples taken from various ingot positions. Growth relationships between the secondary dendritic spacing (λ 2 ) and the growth velocity were determined. The 5052 alloys containing higher Mg content may induce a decrease in λ 2 for a certain growth velocity. The hardness values measured across the three directionally solidified castings were directly related to the λ 2 , which can be considered a fundamental variable affecting mechanical strength. For representative conditions vis-à-vis those employed in industry, it was shown that even relatively small changes in Mg content of the 5052 alloy may have some impact on λ 2 . These results open new ways to predict the final as-cast microstructure characterizing commercial 5052 alloy products, with a view to controlling not only the dendritic growth but also the Mg content during casting operations.

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“…The increased presence of Al 3 Mg 2 phases will lead the material to become more brittle decreasing the strength and ductility of the alloys. Gomes et al [14], however, revealed a different trend: The ultimate tensile strength increases slightly, while the elongation decreases gradually with the increase in the cooling rate for Al-1.2Mg-1.5Fe cast alloys. In his study, as Mg content ranged from 1.2 to 7.0% at low cooling rates, the ultimate tensile strength is nearly constant, while the elongation increased significantly.…”

Section: Introductionmentioning

confidence: 93%

“…Combining with these results in Refs. [10,11,14], it can also be reasoned that the mechanical properties of Al-Mg alloys with moderate-to-high Mg content may be more susceptible to cooling rate than that of Al-Mg alloys with low Mg content. When the cooling rate varies between low and medium, the microstructure and properties may change significantly for Al-Mg alloys with moderate-to-high Mg content.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Mechanical Properties of Sand-Casted Al–5.0Mg–0.6Mn–0.25Ce Alloy

Tang

Wang

Lei

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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This study examines the relationship among cooling rate, microstructure and mechanical properties of a sand-casted Al-5.0Mg-0.6Mn-0.25Ce (wt%) alloy subjected to T4 heat treatment (430 °C × 12 h + natural aging for 5 days), and the tested alloys with wall thickness varying from 5 to 50 mm were prepared. The results show that as the cooling rate increases from 0.22 to 7.65 K/s, the average secondary dendritic arm spacing (SDAS, λ 2 ) decreases from 94.8 to 27.3 μm. The relation between SDAS and cooling rate can be expressed by an equation: 2 = 53.0R −0.345 c . Additionally, an increase in cooling rate was shown not only to reduce the amount of the secondary phases, but also to promote the transition from Al 10 Mn 2 Ce to α-Al 24 (Mn,Fe) 6 Si 2 phase. Tensile tests show that as the cooling rate increases from 0.22 to 7.65 K/s, the ultimate tensile strength (UTS) increases from 146.3 to 241.0 MPa and the elongation (EL) increases sharply from 4.4 to 12.2% for the ascast alloys. Relations of UTS and EL with SDAS were determined, and both the UTS and EL increase linearly with (1/λ 2 ) 0.5 and that these changes can be explained by strengthening mechanisms. Most eutectic Al 3 Mg 2 phases were dissolved during T4 treatment, which in turn further improve the YS, UTS and EL. However, the increment percent of YS, UTS and EL is affected by the cooling rate.

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Dendritic Growth, Solidification Thermal Parameters, and Mg Content Affecting the Tensile Properties of Al-Mg-1.5 Wt Pct Fe Alloys

Cited by 23 publications

References 32 publications

Horizontally Solidified Al–3 wt%Cu–(0.5 wt%Mg) Alloys: Tailoring Thermal Parameters, Microstructure, Microhardness, and Corrosion Behavior

Horizontally Solidified Al–3 wt%Cu–(0.5 wt%Mg) Alloys: Tailoring Thermal Parameters, Microstructure, Microhardness, and Corrosion Behavior

Length Scale of the Dendritic Array Tailoring Strength of a 5052 Aluminum Alloy

Effect of Cooling Rate on Microstructure and Mechanical Properties of Sand-Casted Al–5.0Mg–0.6Mn–0.25Ce Alloy

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