Investigating the effect of the scanning speed on the characteristics of Al-Li alloy fabricated by selective laser melting

Li, Li; Meng, Xiankai; Huang, Shu; Wang, Hui; Li, Peng-Fei; Zhou, Jing

doi:10.1016/j.jmapro.2022.01.040

Cited by 15 publications

(2 citation statements)

References 33 publications

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“…There are fewer research reports on the SLM of Al-Li alloys [36,37]. The Al-Li alloy has a large solidification range and a high thermal expansion coefficient [38,39]. With the addition of Li to the Al-Li alloy, the density of the alloy will first decrease, and then the eutectic grains with low melting point are easily precipitated in the intergranular section during the solidification process [40], resulting in a high hot cracking sensitivity of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al–Li Alloys with Different Li Contents Prepared by Selective Laser Melting

Shao,

Liang,

Yin

et al. 2024

Materials

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Research on the development of new lightweight Al–Li alloys using a selective laser melting process has great potential for industrial applications. This paper reports on the development of novel aluminum–lithium alloys using selective laser melting technology. Al–Cu–Li–Mg–Ag–Sc–Zr pre-alloyed powders with lithium contents of 1 wt.%, 2 wt.% and 3 wt.%, respectively, were prepared by inert gas atomization. After SLM process optimization, the microstructure and mechanical properties of the as-printed specimens were investigated. The densifications of the three newly developed alloys were 99.51%, 98.96% and 92.01%, respectively. They all had good formability, with the lithium loss rate at about 15%. The as-printed alloy with 1% Li content presented good comprehensive properties, with a yield strength of 413 ± 16 MPa, an ultimate tensile strength of 461 ± 12 MPa, and an elongation of 14 ± 1%. The three alloys exhibited a layered molten pool stacking morphology and had a typical heterostructure. The columnar crystals and equiaxed fine grains were alternately arranged, and most of the precipitated phases were enriched at the grain boundaries. The change in Li content mainly affected the precipitation of the Cu-containing phase. When the Li content was 1 wt.%, the following occured: θ phase, T1 phase and TB phase. When Li increased to 2 wt.%, T1 and T2 phases precipitated together. When Li reaches 3 wt.%, δ’ phase precipitated with T2 phase. This study provides useful guidance for the future SLM forming of new crack-free and high-strength Al–Li alloys.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al–Li Alloys with Different Li Contents Prepared by Selective Laser Melting

Shao,

Liang,

Yin

et al. 2024

Materials

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“…There are fewer research reports on the SLM of Al-Li alloys. Al-Li alloys are susceptible to thermal cracking during laser processing due to the large solidification range, high coefficient of thermal expansion, and easy formation of low-melting-point eutectic grains during the solidification process [23,24]. The addition of Li elements to Al-Li alloys reduces the density of the alloys but also increases the solidification temperature range of the alloys and causes precipitation of low-meltingpoint eutectic grains in the intergranular zone, which results in high thermal cracking susceptibility and the tendency of thermal cracking further increases under the action of the high-energy laser beam [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Al-Li Alloys with Different Li Contents Prepared by Selective Laser Melting

Shao,

Liang,

Yin

et al. 2023

Preprint

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Research on the development of new lightweight Al-Li alloys using selective laser melting pro-cess has great potential for industrial applications. This paper reports on the development of novel aluminum-lithium alloys using selective laser melting technology. Al-Cu-Li-Mg-Ag-Sc-Zr pre-alloyed powders with lithium contents of 1 wt.%, 2 wt.% and 3 wt.%, respectively, were prepared by inert gas atomization. After SLM process optimization, the microstructure and me-chanical properties of the as-formed specimens were investigated. The densification of the three newly developed alloys are 99.51 %, 98.96 % and 92.01 %, respectively. They all have good form-ability, with the lithium loss rate about 15 %. The as-formed alloy with 1% Li content presents good comprehensive properties with a yield strength of 412.6 ± 16.0 MPa, an ultimate tensile strength of 461.1 ± 11.7 MPa, and an elongation of 13.6 ± 1.1%. The three alloys exhibit a layered molten pool stacking morphology and have a typical heterostructure. The columnar crystals and equiaxed fine grains are alternately arranged, and most of the precipitated phases are enriched at the grain boundaries. The change of Li content mainly affects the precipitation of Cu-containing phase. When the Li content is 1 wt.%, there are θ phase, T1 phase and TB phase. When Li increased to 2 wt.%, T1 and T2 phases precipitated together. When Li reaches 3 wt.%, δ' phase precipitates with T2 phase. This study provides useful guidance for the future SLM form-ing of new crack-free and high-strength Al-Li alloys.

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Effect of hatch spacing on the characteristics of LPBF 2195 Al-Li alloy

Li,

Gou,

Zhang

et al. 2024

Journal of Alloys and Compounds

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Investigating the effect of the scanning speed on the characteristics of Al-Li alloy fabricated by selective laser melting

Cited by 15 publications

References 33 publications

Microstructure and Mechanical Properties of Al–Li Alloys with Different Li Contents Prepared by Selective Laser Melting

Microstructure and Mechanical Properties of Al–Li Alloys with Different Li Contents Prepared by Selective Laser Melting

Microstructure and Mechanical Properties of Al-Li Alloys with Different Li Contents Prepared by Selective Laser Melting

Effect of hatch spacing on the characteristics of LPBF 2195 Al-Li alloy

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