Anisotropy and size effect in tensile mechanical properties of Al-Cu-Li 2198 alloy

Examilioti, Theano N.; Klusemann, Benjamin; Kashaev, Nikolai; Riekehr, Stefan; Enz, Josephin; Alexopoulos, Nikolaos D.

doi:10.1016/j.prostr.2017.07.052

Cited by 19 publications

(3 citation statements)

References 16 publications

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“…Literature on the latter shows that the use of non-standard tensile test bars does not affect the strength significantly but can influence Young's modulus and the elongation to break. However, the responses of these properties to variations in the gauge size are not consistent and can be material dependent, as demonstrated by these articles: [58,59]. The lowest values of porosity in samples T3-T5 granted them higher tensile properties.…”

Section: Influence Of Size On Tensile Properties and The Fracture Mecmentioning

confidence: 97%

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters

et al. 2019

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Ti-6Al-4V is a popular alloy due to its high strength-to-weight ratio and excellent corrosion resistance. Many applications of additively manufactured Ti-6Al-4V using selective laser melting (SLM) have reached technology readiness. However, issues linked with metallurgical differences in parts manufactured by conventional processes and SLM persist. Very few studies have focused on relating the process parameters to the macroscopic and microscopic properties of parts with different size features. Therefore, the aim of this study was to investigate the effect of the size of features on the density, hardness, microstructural evolution, and mechanical properties of Ti-6Al-4V parts fabricated using a fixed set of parameters. It was found that there is an acceptable range of sizes that can be produced using a fixed set of parameters. Beyond a specific window, the relative density decreased. Upon decreasing the size of a cuboid from (5 × 5 × 5 mm) to (1 × 1 × 5 mm), porosity increased from 0.3% to 4.8%. Within a suitable size range, the microstructure was not significantly affected by size; however, a major change was observed outside the acceptable size window. The size of features played a significant role in the variation of mechanical properties. Under tensile loading, decreasing the gauge size, the ultimate and yield strengths deteriorated. This investigation, therefore, presents an understanding of the correlation between the feature size and process parameters in terms of the microscopic and macroscopic properties of Ti-6Al-4V parts manufactured using SLM. This study also highlights the fact that any set of optimized process parameters will only be valid within a specific size window.

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Section: Influence Of Size On Tensile Properties and The Fracture Mecmentioning

confidence: 97%

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters

et al. 2019

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“…At the same time, the interaction of Ag-Li and Cu-Mg could result in the diffusion of Cu and Li toward Mg-Ag clusters, which facilitated the precipitation of the T1 (Al 2 CuLi) phase. Eventually, nucleation and growth of T1 (Al 2 CuLi) phases could be greatly enhanced [9,10].…”

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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“…The aluminum-lithium alloys have attractive applications in the aerospace industry owing to their lower density, better strength and higher stiffness comparing to the conventionally commercial 2xxx and 7xxx series aluminum alloys [1][2][3][4][5][6][7][8]. However, insufficient plasticity, toughness and obvious anisotropy prevent their universal uptake [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

Zhang

Liang

et al. 2020

Mater. Res. Express

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The effects of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy were explored to further reveal its fatigue behavior and improve the damage tolerance. Fatigue life was investigated on 2198-T3 alloy after pre-deformation and aging treatments. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to study the fracture morphology, precipitation behavior, fatigue crack initiation and propagation. Results indicated that T 1 (Al 2 CuLi) phase dominated the strengthening of 2198-T3 alloy after the further aging. Pre-deformation increased the number of dislocations in the matrix, which provided favorable position for nucleation of T 1 . The precipitation of θ′ (Al 2 Cu) and δ′ (Al 3 Li) were inhibited. Also, the formation and coarsening of precipitate-free zone (PFZ) were effectively avoided in this condition. Dislocation density in the 2198 Al-Li alloy matrix increased with the amount of pre-deformation, leading to an increase in microcrack defects on the surface and inside alloy. As a result, decreased fatigue life and an increased crack growth rate of the alloy were observed. Overall, 2198 Al-Li alloy had the best fatigue life and damage tolerance enhancement after it underwent 3% pre-deformation and was aged at 155°C for 15 h.

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Anisotropy and size effect in tensile mechanical properties of Al-Cu-Li 2198 alloy

Cited by 19 publications

References 16 publications

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters

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

Effect of pre-deformation and artificial aging on fatigue life of 2198 Al-Li alloy

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