Influence of Rare Earths Addition on the Properties of Al–Li Alloys

Nazarov, Sh. A.; Rossi, Stefano; Bison, P.; Ганиев, И. Н.; Pezzato, Luca; Calliari, Irene

doi:10.1134/s0031918x19040094

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…Rare earth elements have special physical and chemical activities and can be used as an ideal adding phase. Adding an appropriate amount of rare earth elements can refine the grain, optimize the structure, and eliminate impurities, and, furthermore, it can improve the comprehensive mechanical properties of alloys or composites [9,10]. As the most widely used high-strength lightweight material, the 2024 aluminum alloy is generally added with alloying elements to improve its microstructure and mechanical properties, and the addition of rare earth elements and their oxides has been proven to be one of the most effective methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of Erbium Micro-Additions on Microstructures and Properties of 2024 Aluminum Alloy Prepared by Microwave Sintering

Qin,

Fan,

et al. 2024

Crystals

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The effects of rare earth erbium (Er) micro-additions on the microstructures and mechanical properties of 2024 aluminum alloy were investigated. The microstructures and fracture surfaces of specimens prepared via high-energy ball milling, cold isostatic pressing and microwave sintering were carried out by optical microscopy (OM) and scanning electron microscopy (SEM). Under the conditions of sintering heating rate of 20 min/°C and soaking time of 30 min at 490 °C, it was found that with the increase in Er addition, the grain size first decreased then increased, and it reached a minimum size of about 5 μm when the Er content was 0.6%, showing that the grains were refined. At the same time, the compactness and microhardness reached maximum levels, which were 97.6% and 94.5 HV, respectively. Moreover, the tensile strength and elongation reached the peak at 160.5 MPa and 4.4%, respectively. The dynamic mechanical response of Er/2024Al alloy with different Er content was studied through a split Hopkinson pressure bar (SHPB) at strain rates of 600 s−1 and 800 s−1, respectively. Both at the strain rates of 600 s−1 and 800 s−1, the dynamic yield stress of the specimens increased gradually with an increase in Er content. For the 0.6 wt.% Er specimen, the dynamic yield stress reached 371.3 MPa at a strain rate of 800 s−1, which was 28.2% higher than that at a strain rate of 600 s−1. When the strain rate is 800 s−1, the deformation degree of the 0.6 wt.%Er specimen is 55.3%, which is 14.7% higher than for the Er-free one, and there are adiabatic shear bands formed in the 0.6 wt.%Er specimen. Through a fracture analysis of the samples, a certain number of dimples appeared in the fracture of an impact specimen, indicating that the addition of Er improved the toughness of the material. This research can provide a reference for the development and application of high-performance aluminum alloy in automotive structural materials.

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Section: Introductionmentioning

confidence: 99%

Effect of Erbium Micro-Additions on Microstructures and Properties of 2024 Aluminum Alloy Prepared by Microwave Sintering

Qin,

Fan,

et al. 2024

Crystals

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“…In addition, being different from Mn, Zn could also dissolve into the matrix to form β'(Al 3 Zr) phases, which could become the nucleation core of δ' (Al 3 Li) phase [11]. According to recent research [12,13], rare-earth elements such as Ce and La could effectively decrease the negative effect caused by Fe and Si and remove the grain boundary weakening effect from Na and K impurities.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Al-5Cu-1Li-0.6Mg-0.5Ag-0.5Mn Alloys

Chen

Zhang

Ding

et al. 2020

Metals

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Microstructural optimization of Al-Li alloys plays a key role in the adjustment of mechanical properties as well as corrosion behavior. In this work, Al-5Cu-1Li-0.6Mg-0.5Ag-0.5Mn alloy was homogenized at different temperatures and holding times, followed by aging treatment. The microstructure and composition of the homogenized alloys and aged alloys were investigated. There were Al7Cu4Li phase, Al3Li phase, and Al2CuLi phases in the homogenized alloys. The Al7Cu4Li phase was dissolved with an increase in homogenization temperature and holding time. Al2Cu phase and Al2CuLi phase coarsened during the homogenization process. The alloy homogenized at 515 °C for 20 h was subjected to a two-stage aging treatment. Peak-age alloy, which had gone through age treatment at 120 °C for 4 h and 180 °C for 6 h, was mainly composed of α-Al, Al20Cu2Mn3, Al2CuLi, Al2Cu, and Al3Li phases. Tafel polarization of the peak-age alloys revealed the corrosion potential and corrosion current density to be −779 mV and 2.979 μA/cm2, respectively. The over-age alloy had a more positive corrosion potential of −658 mV but presented a higher corrosion current of 6.929 μA/cm2.

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