Effect of alloying with transition metals on the aging of anomalously supersaturated solid solution of Al–Mg alloys

Monastyrska, Tetiana O.; Berezina, A.L.; Molebny, Oleh A.; Kotko, Andrii V.

doi:10.1007/s13204-021-01705-x

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…The composition of particles in Al-Sc-Zr alloys was studied in sufficient detail in many works (see, for example, [123][124][125][126][127][128][129][130][131][132][133][134][135]). As shown in [136], precipitation of Al3(Sc0.5Zr0.5) particles is more energetically favorable than that of Al3Sc and Al3Zr particles.…”

Section: Discussionmentioning

confidence: 99%

Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys

Чувильдеев¹,

Gryaznov²,

Shotin³

et al. 2022

Preprint

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Al-6%Mg-Sc-Zr alloys with the total ratio of Sc + Zr = 0.32 wt.% make up the target of this research. The content of scandium and zirconium varied with an increment of 0.02%. The alloys were produced by induction casting. Their ultrafine-grained (UFG) microstructure was formed with Equal Channel Angular Pressing (ECAP). Such cast alloys have a homogeneous macrostructure formed by small equiaxed grains in the central part of the ingot and columnar crystals along the edges of the cross section. After ECAP, the average grain size in the alloy specimens is 0.5–1 µm. The average grain size does not depend on the ratio of Sc and Zr in these alloys. Superplasticity tests were performed at temperatures ranging from 300 to 500 °C and at a strain rate varying between 3.3·10-3 and 3.3·10-1 s-1. UFG Al-6%Mg-0.20%Sc-0.12%Zr and Al-6%Mg-0.18%Sc-0.14%Zr alloys exhibit the highest superplasticity. It was suggested that changes in Sc:Zr ratio affect spatial distribution and composition of the following precipitating particles: Al3Sc, Al3Zr, Al3(ScxZr1-x). An increase in Zr concentration is shown to reduce the susceptibility of UFG alloys to cavitation fracture.

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Section: Discussionmentioning

confidence: 99%

Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys

Чувильдеев¹,

Gryaznov²,

Shotin³

et al. 2022

Preprint

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“…Such dispersoids exhibit core-shell structure with Sc-enriched core and Zr-enriched shell [47][48][49][50]. The lowdiffusion Zr atoms improve the thermal stability, and the high-diffusion Sc atoms accelerate the nucleation of the dispersed phase [51]. The addition of Sc/Zr elements facilitates the formation of fine equiaxed grains, which can effectively adapt to the strains generated during the SLM process and avoid solidification cracks.…”

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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“…These elements predominately have extremely low solubility in aluminum. However, the supersaturated solid solution of aluminum with TM can be formed through a solidification with an increased cooling rate [66]. Subsequent heat treatment of the supersaturated solid solution initiates its decomposition accompanied by the precipitation of nanoscale intermetallic particles.…”

Section: Introductionmentioning

confidence: 99%

“…These elements form the complex L1 2 -structured phase Al 3 (Sc,Zr) [37,38,71,72]. Such dispersoids exhibit core-shell structure with Sc enriched core and Zr enriched shell [66,73]. Low diffusive Zr atoms significantly improve the thermal stability of particles whereas high diffusive Sc accelerates the nucleation of dispersoids [74] and strongly reduces the annealing time required to form a high number density of precipitates.…”

Section: Introductionmentioning

confidence: 99%

Particle Stimulated Nucleation Effect for Al-Mg-Zr-Sc Alloys with Ni Addition during Multidirectional Forging

Kishchik,

Mochugovskiy,

Cuda

et al. 2023

Metals

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The study aims to investigate the influence of fraction of coarse undeformed particles on the microstructure evolution and mechanical properties of alloys processed by isothermal multidirectional forging (MDF). For this purpose, Al-Mg-Ni-Sc-Zr-based alloys with different Ni concentrations and a fraction of Al3Ni particles of solidification origin phase were subjected to MDF at 350 °C. Precipitates of the L12-structured Al3(Sc,Zr) phase retained their structure, morphology, and size after MDF and were coherent with the aluminum matrix. The Al3Ni phase particles stimulated the nucleation of recrystallized grains and contributed significantly to the formation of an ultrafine-grained structure. The uniformity of the grain structure increased, and the average grain size decreased with an increase in the fraction of Al3Ni particles. A fine-grained structure with a mean grain size of 2.4–3.4 µm was observed after MDF with a cumulative strain of 12. The results demonstrate that a bimodal particles size distribution with a volume fraction of nanoscale f~0.1% and microscale f~8% particles provided for the formation of a homogenous fine-grained structure after MDF and improved the mechanical properties.

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Effect of alloying with transition metals on the aging of anomalously supersaturated solid solution of Al–Mg alloys

Cited by 6 publications

References 7 publications

Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys

Effect of Sc:Zr Ratio on Superplastic Behavior of Ultrafine-grained Al-6%Mg-Sc-Zr Alloys

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

Particle Stimulated Nucleation Effect for Al-Mg-Zr-Sc Alloys with Ni Addition during Multidirectional Forging

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