Enhanced mechanical properties of high-temperature-resistant Al–Cu cast alloy by microalloying with Mg

Rakhmonov, Jovid; Liu, Kun; Pan, Lei; Breton, Francis; Chen, X.-Grant

doi:10.1016/j.jallcom.2020.154305

Cited by 61 publications

(14 citation statements)

References 38 publications

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“…Mg can improve the performance of the anodic oxide film, increase the strength and yield limit, and improve the machinability of the alloy by adding a small amount (about 0.2 to 0.3%) to high-silicon aluminum alloys. The aluminum alloy containing 8 % Mg had excellent corrosion resistance [ 26 , 27 , 28 , 29 , 30 ]. The main beneficial effect of Fe in aluminum alloys was to reduce sticking to the mold.…”

Section: Resultsmentioning

confidence: 99%

A Study on High Strength, High Plasticity, Non-Heat Treated Die-Cast Aluminum Alloy

Guo

2021

Materials

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The non-heat-treated, die-cast aluminum alloy samples were prepared meticulously via die-casting technology. The crystal structure, microstructure, and phase composition of the samples were comprehensively studied through electron backscatter diffraction (EBSD), metallographic microscopy, spectrometer, and transmission electron microscopy (TEM). The microhardness and tensile properties of the samples were tested. The die-cast samples were found to have desirable properties by studying the structure and performance of the samples. There were no defects, such as pores, cold partitions, or surface cracks, found. The metallographic structure of the samples was mainly α-Al, and various phases were distributed at the grain boundaries. Before heat treating, α-Al grains were mainly equiaxed with a great number of second phase particles at the grain boundaries. After heat treating, the α-Al grains were massive and coarsened, and the second phase grains were refined and uniformly distributed, compared with those before the heat treating. The EBSD results showed that the grain boundary Si particles were solid solution decomposed after heat treatment. The particles became smaller, and their distribution was more uniform. Transmission electron microscopy found that there were nano-scale Al-Mn, Al-Cu, and Cu phases dispersed in the samples. The average microhardness of the samples before heat treating was 114 HV0.1, while, after the heat treating, the microhardness reached 121 HV0.1. The mechanical features of the samples were tremendous, and the obtained die-cast aluminum alloy had non-heat-treatment performance, which was greater than the ordinary die-cast aluminum alloys with a similar composition. The tensile strength of the aluminum alloys reached up to 310 MPa before heat treatment.

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Section: Resultsmentioning

confidence: 99%

A Study on High Strength, High Plasticity, Non-Heat Treated Die-Cast Aluminum Alloy

Guo

2021

Materials

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“…The mechanical properties of Al-Cu alloys are highly dependent on the parameters of the precipitates, such as the lattice structure, number density, shape, and size and distribution of the particles [2]. Al-Cu alloys have a high strength at room and elevated temperatures [1,3]. The high heat resistance of the Al-Cu alloys provides thermal stability to the θ' (Al 2 Cu) precipitates [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Zr on Microstructure and Mechanical Properties of the Al–Cu–Yb and Al–Cu–Gd Alloys

Мамзурина

Амер

Логинова

et al. 2022

Metals

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The effect of zirconium on the microstructure, phase composition, and mechanical properties of AlCuYb and AlCuGd alloys was studied. The microstructure of the as-cast alloys did not consist of new intermetallic phases of zirconium with other elements, so the zirconium was fully dissolved in the aluminum matrix. The AlCuYbZr/AlCuGdZr alloys demonstrated higher hardness values compared to the AlCuYb/AlCuGd alloys due to the precipitation of the Al3(Zr,Yb) and Al3(Zr,Gd) phases, which were formed during the homogenization treatment. The AlCuYbZr alloy had a 10-20 MPa higher yield and tensile strength than the AlCuGdZr alloy at the same annealing temperature and time. The AlCuYbZr alloy exhibited good mechanical tensile properties at an annealing temperature of 100 °C for 1h, with a yield strength of 276 MPa, ultimate tensile strength of 312 MPa, and elongation of 3.1%, while the as-rolled AlCuGdZr alloy had similar mechanical tensile properties, with a yield strength of 279 MPa, ultimate tensile strength of 307 MPa, and elongation of 4.8%. At an annealing temperature of 300 °C for 10 min, The AlCuYbZr and AlCuGdZr alloys showed a good ductility of 10.5% and 8%, respectively, with 207 MPa yield strength for both alloys. AlCuYbZr and AlCuGdZr alloys are a prospective base composition for developing novel high technology heat resistant aluminum alloys.

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“…Likewise, Xie et al [36] also provided the same conclusion for the effect of rare earth elements, in their case, an erbium (Er) addition was made to an as-cast Al-Cu-Mg-Ag alloy, from which they suggested that the strength properties of Er-added alloys at 300 • C were found to be enhanced, benefitting from the pinning effect of the Al 8 Cu 4 Er phase on grain boundaries. Meanwhile, the detrimental effect of undissolved second phases and/or impurities at the grain boundaries could also have an adverse effect on the mechanical properties [36][37][38][39][40]. This is because the brittle phase could result in undesirable rapid crack growth during mechanical testing.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Enhanced mechanical properties of high-temperature-resistant Al–Cu cast alloy by microalloying with Mg

Cited by 61 publications

References 38 publications

A Study on High Strength, High Plasticity, Non-Heat Treated Die-Cast Aluminum Alloy

A Study on High Strength, High Plasticity, Non-Heat Treated Die-Cast Aluminum Alloy

Effect of Zr on Microstructure and Mechanical Properties of the Al–Cu–Yb and Al–Cu–Gd Alloys

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

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