Effects of Alloying Elements Additions on Ambient Temperature Performance of Al–Si–Cu–Mg Base Alloys

Elizondo, Garza; Elsharkawi, E. A.; Samuel, A. M.; Doty, H. W.; Samuel, F. H.

doi:10.1007/s40962-020-00568-2

Cited by 9 publications

(10 citation statements)

References 16 publications

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“…As inferred from Figure 2, during the course of solidification, the β phase undergoes partial decomposition into a new π phase in the form of pale colored Chinese script as shown in Figure 12a, having a stoichiometric composition of Al 8 Mg 3 FeSi 6 , alloys RC1 through RC5. According to Elsharkawi et al [30,31], this phase is unstable and decomposes into short platelets of β-Al 5 FeSi during SHT as illustrated in Figure 12b. Figure 12c shows precipitation of the new β-platelets in the form of fishbone structure; the broken line points to their plate-like nature.…”

Section: Copper-rich Intermetallicsmentioning

confidence: 94%

Intermetallics Formation during Solidification of Al-Si-Cu-Mg Cast Alloys

et al. 2022

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The present study was undertaken to examine the effect of iron, manganese, copper and magnesium on the microstructural characteristics of Al-11%Si-2%Cu-Mg-based alloy referred to as 396 under different working conditions. The results show that strontium (Sr) has high affinity to react with magnesium (Mg), resulting in reduced effectiveness as eutectic silicon modifier or age hardening agent. In addition, Sr alters the sequence of the precipitation of the α-AlFeMnSi phase from post-eutectic to pro-eutectic which would hardens the soft α-Aluminum matrix. The mechanism is still under investigation. The interactions between iron (Fe) and Mg and Sr-Mg result in the formation of serval dissolvable intermetallics during the solutionizing treatment such as β-AlFeSi, π-AlFeMgSi and Q-AlMgSiCu phases. The study also emphasizes the role of modification and grain refining as well as intermetallics in porosity formation and hardness of samples aged in the temperature range 155–240 °C.

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Section: Copper-rich Intermetallicsmentioning

confidence: 94%

Intermetallics Formation during Solidification of Al-Si-Cu-Mg Cast Alloys

et al. 2022

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“…In another view illustrated in Figure 8c, small particles of Q-phase are seen growing out of the (Al-Al 2 Cu) eutectic network. As noted in Table 3, alloy A contains ~0.06 wt% Mg [38].…”

Section: Macrostructure and Microstructurementioning

confidence: 98%

“…In another view illustrated in Figure 8c, small particles of Q-phase are seen growing out of the (Al-Al2Cu) eutectic network. As noted in Table 3, alloy A contains ~0.06 wt% Mg [38]. Increasing the Mg content in alloy C coupled with a slow solidification rate resulted in the precipitation of a large volume fraction of both π-Fe and Q-Al8Mg3FeSi6 phases [39], followed by the precipitation of Mg2Si particles, as shown in Figure 9a.…”

Section: Macrostructure and Microstructurementioning

confidence: 99%

“…Increasing the Mg content in alloy C coupled with a slow solidification rate resulted in the precipitation of a large volume fraction of both π-Fe and Q-Al8Mg3FeSi6 phases [39], followed by the precipitation of Mg2Si particles, as shown in Figure 9a. Figure 9b reveals the precipitation of Q-Al5Cu2Mg8Si6 [38] in the form of large particles located at the edges of the Al2Cu phase particles explaining the explicit peak observed in Figure 6d, reaction #6 in Table 4, and confirmed by the EDS spectrum exhibited in Figure 9c corresponding Increasing the Mg content in alloy C coupled with a slow solidification rate resulted in the precipitation of a large volume fraction of both π-Fe and Q-Al 8 Mg 3 FeSi 6 phases [39], followed by the precipitation of Mg 2 Si particles, as shown in Figure 9a. Figure 9b reveals the precipitation of Q-Al 5 Cu 2 Mg 8 Si 6 [38] in the form of large particles located at the edges of the Al 2 Cu phase particles explaining the explicit peak observed in Figure 6d, reaction #6 in Table 4, and confirmed by the EDS spectrum exhibited in Figure 9c corresponding to the area marked X in Figure 9b.…”

Section: Macrostructure and Microstructurementioning

confidence: 99%

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The Role of Mg Content and Aging Treatment on the Tensile and Fatigue Properties of Die-Cast 380 Alloy

et al. 2022

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The main objective of this contribution was to determine the impact of magnesium (Mg) concentration and solidification rate (about 800 °C/s) on the mechanical properties of commercial A380.1 die-cast alloy. Respective amounts of 0.10%, 0.30%, and 0.50% Mg were used to establish their influence on the main tensile properties, namely, the ultimate limit, the elastic limit, and the percentage of elongation to fracture. The study also focused on the effect of magnesium on the fatigue behavior of A380.1 alloy where the role of surface defects and internal defects (porosity, oxide films, and inclusions) on the alloy fatigue life was also determined. The tensile properties were analyzed in order to optimize the heat treatments of T6 (under-aging) and T7 (over-aging). Consequently, the influence of several parameters was evaluated using tensile testing and optical and scanning electron micrography. Fatigue strength was investigated by performing rotational bending tests. The results show that the alloy tensile strength parameters improve with up to 0.3% Mg. Further addition of Mg, i.e., 0.5%, does not produce any significant improvement with respect to either traction or fatigue. It is observed that the tensile properties fluctuate according to the Guinier–Preston zones which occur during heat treatment, while the fatigue properties decrease as the Mg content increases. In contrast to a mechanical fatigue failure mechanism, in the present study, cracks were initiated at the sample’s outer surface and then propagated toward the center.

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“…In the case of the Al-Cu alloys mentioned earlier, during the precipitation-hardening heat treatments, the supersaturated Al-Cu solid solution gives rise to Guinier-Preston (GP) zones and θ , θ , and θ phases, with a loss in coherency and an increase in particle size as aging time is increased. If the aging time were fixed, then this sequence of events would occur with an increase in the aging temperature [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Zr and Ti Addition and Aging Treatment on the Microstructure and Tensile Properties of Al-2%Cu-Based Alloys

et al. 2022

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The present work investigated the effect of aging treatment on the microstructure and tensile properties of an Al-2%Cu base alloy containing various additions of Zr and other alloying elements. Aging was carried out at temperatures of 180–300 °C for different aging times at each temperature. The tensile properties indicated that Zr additions improved the strength of the base alloy, especially at high Zr levels at 180 °C. At the 220 °C aging temperature, however, while Zr addition did not have a beneficial effect on the alloy strength, the ductility was found to improve. Zr-Ti combined additions had a significant effect on the microstructure of the base alloy, as the morphology of the α-Al grains transformed into a non-dendritic morphology, and the grain size decreased sharply. These effects were at their maximum at 180 °C and 0.5 wt% Zr addition. Moreover, the Zr-containing alloys aged at higher temperatures, such as 220 °C and 240 °C, maintained a noticeably higher level of strength over the base alloy aged at the same temperatures. Quality index charts based on the tensile test data also reflected an improvement in alloy quality and strength with Zr-Ti combined additions.

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Effects of Alloying Elements Additions on Ambient Temperature Performance of Al–Si–Cu–Mg Base Alloys

Cited by 9 publications

References 16 publications

Intermetallics Formation during Solidification of Al-Si-Cu-Mg Cast Alloys

Intermetallics Formation during Solidification of Al-Si-Cu-Mg Cast Alloys

The Role of Mg Content and Aging Treatment on the Tensile and Fatigue Properties of Die-Cast 380 Alloy

Effect of Zr and Ti Addition and Aging Treatment on the Microstructure and Tensile Properties of Al-2%Cu-Based Alloys

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