Effect of erbium (Er) on the hot cracking behaviour of Al-5Cu alloy

Zou, Minqiang; Ge, Zhen; Liang, Qi; Zhou, Xingyu; Wei, Xinyu; Zhang, Jiayi; Chen, Jiqiang

doi:10.1080/02670836.2022.2088160

Cited by 4 publications

(1 citation statement)

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“…When the Er content is 0.8%, the compactness of the alloy decreases. It is regarded, through analysis, that an interaction occurred between Er and Al, and Cu in the 2024Al matrix, meaning the Al 8 Cu 4 Er phase with a low melting point is formed, and closed pores are generated in a local range, making the gas difficult to discharge [25][26][27]. On the other hand, due to the strong enrichment ability of rare earth Er in the matrix, most of the rare earth Er will gather at the junction of the two-phase interface.…”

Section: Compactness and Microhardnessmentioning

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: Compactness and Microhardnessmentioning

confidence: 99%