Microstructure and Mechanical Properties of the As‐Cast AlLiCuMgZr Alloy with High Li Content and Different Cu/Mg Ratios

Yu, Tao; Qian, Bingyu; Wu, Ruizhi; Sun, Jianfeng; Zhao, Hui

doi:10.1002/adem.201901570

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…Peng, et al [5] reported that alloying with Zr could make the grains of Al-Li alloys become isometric, and primary and secondary dendrite arm space of Al-Li alloys could be reduced. Yu, et al [6] also reported that precipitates in as-cast Al-Li-Mg-Cu-Zr alloy were different for different ratio of Cu and Mg. When the ratio of Cu:Mg was higher than 6: 1, the alloy was mainly composed of α(Al), T2(Al 6 CuLi 3 ) and coarse Al 4 Cu 9 .…”

Section: Introductionmentioning

confidence: 98%

Untitled

2021

Int J Metall Met Phys

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Alloying based on Al-Li alloys plays an important factor for an adjustment of microstructure as well as corrosion behavior. In this study, we mainly focus on microstructural evolution of Al-4.5Cu-1Li-0.4Mg-0.4Ag-0.4Mn-0.5Zn alloy during homogenization and aging treatment. Microstructure and composition of the homogenized alloys and aged alloys were investigated. The homogenized alloys were mainly composed of Al(α), Al 7 Cu 4 Li, Al 3 Li and Al 2 CuLi precipitates. All precipitates coarsened with increase of homogenization temperature and holding time. Peak-age could realize when the homogenized and solution-treated alloy was aged at 120 °C for 4 hours and then 180 °C for 10 hours. The peak-age alloy was mainly composed of Al 2 CuLi, Al 20 Cu 2 Mn3 and Cu-rich precipitates. In the 0.5% NaCl solution, corrosion potential and corrosion current density of the peak-age alloy were -573 mV and 1.028 μA/cm 2 , respectively. And the overage alloy had more positive current potential of -557 mV and higher corrosion density of 4.487 μA/cm 2 . In the 3.5% NaCl solution, Tafel polarization of the peak-age alloy revealed the corrosion potential and corrosion current density to be -611 mV and 2.005 μA/cm 2 , respectively. The over-age alloy had more negative corrosion potential of -653 mV.

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Section: Introductionmentioning

confidence: 98%

Untitled

2021

Int J Metall Met Phys

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“…Although the Al 20 Cu 2 Mn 3 phase can improve the alloy strength, it cannot solve the problem of grain coarsening [ 12 ]. Previous works have evidenced that Al 3 Zr dispersoids formed in 7xxx series alloys via minor Zr addition can significantly improve the inhibition of recrystallization or grain growth, as well as the strength of the alloy [ 13 , 14 , 15 , 16 , 17 ]. Additionally, the two-stage heterogenization treatment produces finer and denser Al 3 Zr dispersoids which help to increase the recrystallization resistance in 7xxx series alloys [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Heterogenization Treatment on the Hot-Working Temperature and Mechanical Properties of Al-Cu-Mg-Mn-(Zr) Alloys

et al. 2023

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This study investigated the effects of a minor Zr addition (0.15 wt%) and heterogenization treatment (one-stage/two-stage) on the hot-working temperature and mechanical properties in Al-4.9Cu-1.2Mg-0.9Mn alloy. The results indicated that the eutectic phases (α-Al + θ-Al2Cu + S-Al2CuMg) dissolved after heterogenization, retaining θ-Al2Cu and τ1-Al29Cu4Mn6 phases, while the onset melting temperature increased to approximately 17 °C. A change in the onset melting temperature and evolution of the microstructure is used to assess an improvement in hot-working behavior. With the minor Zr addition, the alloy exhibited enhanced mechanical properties due to grain growth inhibition. Zr-added alloys show 490 ± 3 MPa ultimate tensile strength and 77.5 ± 0.7 HRB hardness after T4 tempering, compared to 460 ± 2.2 MPa and 73.7 ± 0.4 HRB for un-added alloys. Additionally, combining minor Zr addition and two-stage heterogenization resulted in finer Al3Zr dispersoids. Two-stage heterogenized alloys had an average Al3Zr size of 15 ± 5 nm, while one-stage heterogenized alloys had an average size of 25 ± 8 nm. A partial decrease in the mechanical properties of the Zr-free alloy was observed after two-stage heterogenization. The one-stage heterogenized alloy had 75.4 ± 0.4 HRB hardness after being T4-tempered, whereas the two-stage heterogenized alloy had 73.7 ± 0.4 HRB hardness after being T4-tempered.

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Evolution of micropores and second phases during hot deformation of 2050 Al-Li alloy

Luo,

Zhou,

et al. 2024

Journal of Alloys and Compounds

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Microstructure and Mechanical Properties of the As‐Cast AlLiCuMgZr Alloy with High Li Content and Different Cu/Mg Ratios

Cited by 4 publications

References 34 publications

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Effects of Heterogenization Treatment on the Hot-Working Temperature and Mechanical Properties of Al-Cu-Mg-Mn-(Zr) Alloys

Evolution of micropores and second phases during hot deformation of 2050 Al-Li alloy

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