Effects of Mg Content on the Microstructural and Mechanical Properties of Al-4Cu-xMg-0.3Ag Alloys

Alshammari, Talal Talib; Alharbi, Hamad F.; Soliman, Mahmoud S.; Ijaz, Muhammad Farzik

doi:10.3390/cryst10100895

Cited by 8 publications

(14 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, Alloy 2 showed a relatively higher value of ultimate tensile strength, which was above 200 MPa. It is well known that the improvement in the thermal stability at elevated temperature is plausible from the formation of high coarsening resistance of the omega phase (Ω) plate formation, but our experimental results make the relationships more explicit, which is inconsistent with previous studies [13][14][15][16][17][18][20][21][22][23][24]. Interestingly, from the viewpoint of omega phase formation (Ω), it is noteworthy that although Ag content was the same in both Alloy 1 and Alloy 2, it is strongly believed that the presence of Mg atoms together with Ag atoms greatly stabilizes the interface structure and, consequently, promotes the Ω phase on the Al {1 1 1} habit planes.…”

Section: Effect Of Cu/mg Ratio On the Microstructure Evolution Of Peak Aged Alloyscontrasting

confidence: 99%

“…Owing to the difference in the atomic size of the alloying element and the higher amount of solute content, it is plausible that higher hardness could be attributed to local lattice distortion, which would have raised the energy barrier against dislocation movement during the indentation, giving rise to the solid solution phenomenon. Moving further, it is evident that from the beginning of the artificial aging process there was a progressive increase in hardness values for both of the alloys, which is consistent with the previously reported literature [13,17,18,30]. The monotonic increase in hardness values can be related to the formation of precipitation phases from the supersaturated Al matrix.…”

Section: Effect Of Cu/mg Ratio On the Age-hardening Behaviorsupporting

confidence: 89%

“…Figure 1 shows the diffraction pattern plots of intensity against the angle of the detector, 2θ at room temperature. As shown in Figure 1 the XRD profile of both studied alloys displayed the strong characteristic peak of α-Al and very small peaks of precipitates [18,[40][41][42][43][44], which have been marked by black arrows in Figure 1. Similarly, Figure 2 shows the optical microscopy results; broadly, the microscopic observations were consistent with the XRD analysis.…”

Section: Effect Of Cu/mg Ratio On the As-cast Microstructurementioning

confidence: 87%

“…Nonetheless, in the room-temperature tensile testing environment, the effect of grain refinement strengthening was far greater than the precipitation strengthening. [13,15,18,20,27,31,42]. 2.…”

Section: Effect Of Cu/mg Ratio On the Microstructure Evolution Of Peak Aged Alloysmentioning

confidence: 99%

“…Likewise, with respect to compositional design of the Al-Cu-Mg alloy with a low Cu to Mg ratio (e.g., Al 2024), precipitation behavior is mainly dominated by the formation of a magnesium-rich phase [Al 2 CuMg (S-precipitate)], which has an orthorhombic structure lying on a {210} Al habit plane [6]. In comparison, a high Cu to Mg ratio stimulates the formation of copper-rich phases of [Al 2 Cu (θ -precipitate)] which lie on the {001} Al habit plane [16][17][18][19][20], such as copper-rich phase (Al 2 Cu, θ) and (Al 2 CuMg, S) from the supersaturated solid solution of α-Al matrix. The overall dispersion strengthening mechanism by the virtue of these precipitates in this kind of alloy depends upon various factors, such as size, shape, spatial distribution, and volume fraction of the different intermetallic phases.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Comparison of Mechanical and Microstructural Properties of as-Cast Al-Cu-Mg-Ag Alloys: Room Temperature vs. High Temperature

et al. 2021

Self Cite

View full text Add to dashboard Cite

Unfolding the structure–property linkages between the mechanical performance and microstructural characteristics could be an attractive pathway to develop new single- and polycrystalline Al-based alloys to achieve ambitious high strength and fuel economy goals. A lot of polycrystalline as-cast Al-Cu-Mg-Ag alloy systems fabricated by conventional casting techniques have been reported to date. However, no one has reported a comparison of mechanical and microstructural properties that simultaneously incorporates the effects of both alloy chemistry and mechanical testing environments for the as-cast Al-Cu-Mg-Ag alloy systems. This preliminary prospective paper presents the examined experimental results of two alloys (denoted Alloy 1 and Alloy 2), with constant Cu content of ~3 wt.%, Cu/Mg ratios of 12.60 and 6.30, and a constant Ag of 0.65 wt.%, and correlates the synergistic comparison of mechanical properties at room and elevated temperatures. According to experimental results, the effect of the precipitation state and the mechanical properties showed strong dependence on the composition and testing environments for peak-aged, heat-treated specimens. In the room-temperature mechanical testing scenario, the higher Cu/Mg ratio alloy with Mg content of 0.23 wt.% (Alloy 1) possessed higher ultimate tensile strength when compared to the low Cu/Mg ratio with Mg content of 0.47 wt.% (Alloy 2). From phase constitution analysis, it is inferred that the increase in strength for Alloy 1 under room-temperature tensile testing is mainly ascribable to the small grain size and fine and uniform distribution of θ precipitates, which provided a barrier to slip by deaccelerating the dislocation movement in the room-temperature environment. Meanwhile, Alloy 2 showed significantly less degradation of mechanical strength under high-temperature tensile testing. Indeed, in most cases, low Cu/Mg ratios had a strong influence on the copious precipitation of thermally stable omega phase, which is known to be a major strengthening phase at elevated temperatures in the Al-Cu-Mg-Ag alloying system. Consequently, it is rationally suggested that in the high-temperature testing scenario, the improvement in mechanical and/or thermal stability in the case of the Alloy 2 specimen was mainly due to its compositional design.

show abstract