Improving creep resistance of Al-12 wt.% Ce alloy by microalloying with Sc

Meng, Yu; Zhang, Peng; Yang, Chong; Cheng, P.M.; Guo, Shengwu; Liu, Gang; Sun, Jun

doi:10.1016/j.scriptamat.2021.113838

Cited by 49 publications

(10 citation statements)

References 36 publications

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“…Therefore, the equiaxed crystalline grains cannot be explained by the same mechanism as that for a chill zone. A similar anomalous microstructure was observed in inoculated AMed Al alloys [1][2][3][4][5]; specifically, inoculant compounds with high melting points remain undissolved near the fusion line in the heating process and act as heterogeneous nucleation sites for equiaxed grains. The similarities in the microstructure suggest that the unique equiaxed grains observed in Al-Si hypoeutectic alloys can also be formed by a heterogeneous nucleation mechanism.…”

Section: Introductionsupporting

confidence: 56%

“…Additively manufactured (AMed) aluminum (Al) alloy parts are being increasingly employed in industrial applications, in particular transport equipment, such as automobiles, motorcycles, airplanes, and spaceplanes, because of their high specific strength, high fatigue resistance, and the degree of freedom in their shape [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Al alloys with an equiaxed microstructure show good mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Al alloys with an equiaxed microstructure show good mechanical properties. Therefore, commonly used AMed Al alloys also have fine equiaxed grains, which are achieved by introducing rare-earth inoculant elements to form dissoluble particles as heterogeneous nucleation sites [1][2][3][4][5]. However, expensive rare-earth inoculant elements substantially increase the cost of the powder.…”

Section: Introductionmentioning

confidence: 99%

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Equiaxed Grain Formation by Intrinsic Heterogeneous Nucleation Via Rapid Heating and Cooling in Additive Manufacturing of Aluminum-Silicon Hypoeutectic Alloy

Okugawa

Ohigashi²,

Furushiro

et al. 2022

SSRN Journal

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Equiaxed Grain Formation by Intrinsic Heterogeneous Nucleation Via Rapid Heating and Cooling in Additive Manufacturing of Aluminum-Silicon Hypoeutectic Alloy

Okugawa

Ohigashi²,

Furushiro

et al. 2022

SSRN Journal

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“…Due to a negligible solid-state solubility of cerium in aluminum, alloying to generate precipitation hardening was exercised using highly effective Sc. [3] Then, combined additions of Sc and Zr, e.g. 0.2 wt.…”

Section: Introductionmentioning

confidence: 99%

Aluminum Cast Alloys Based on the Al–Ce–Si–Mg System: An Influence of Silicon on Crystallization, Phase Composition, and Tensile Properties

Czerwiński

Amirkhiz

2022

Metall Mater Trans A

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An attempt at strengthening the aluminum-cerium-based alloys through additions of silicon was assessed using the experimental Al5Ce3Si0.5Mg (wt. pct) cast hypoeutectic composition, designed based on the commercial A356 (Al–7Si–0.3Mg, wt pct) grade by substituting a portion of Si with Ce. To determine a role of Si, the Al5Ce0.5Mg (wt. pct) reference was cast and tested under identical conditions. An addition of 3 wt. pct Si to the Al5Ce0.5Mg base increased the room temperature yield stress almost three times, from 47 to 135 MPa, but reduced its elongation by an order of magnitude from 8 pct to that below 1 pct. A presence of Si led also to essential changes in the alloy crystallization with the melting range widened substantially from 10 °C to 91 °C mainly due to a reduction in the solidus level. As-cast microstructure of the Al5Ce0.5Mg base consisting the primary αAl along with 44 pct of the αAl + Al11Ce3 eutectic was replaced in the Al5Ce3Si0.5Mg alloy with the αAl + AlCeSi2 coarse lamellae ternary eutectic, bulky compounds having the Ce-rich core of AlCe2Si with external shell of Al2CeSi2 along with the quaternary eutectic of fine αAl, Si, Al2MgSi/Al2Mg2Si, and Al–Si–Mg-Ce phases. The fractographic analysis revealed that additions of Si caused a transition from largely ductile fracture to the predominantly brittle mode with crack paths propagating mainly along the interface between the coarse AlCeSi2 lamellae and Al(Si, Mg) solid solution, which explains the measured drastic reduction in the alloy elongation. Graphical Abstract

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“…Therefore, they have been widely adopted in industrial fields, such as manufacturing automobiles, motorcycles, airplanes, and spacecraft [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. Al alloys with fine equiaxed grain microstructures exhibit excellent characteristics with respect to the aforesaid applications; therefore, inoculants are introduced as heterogeneous nucleation sites for further microstructure refinement [ 5 , 6 , 7 , 8 , 9 , 19 , 20 , 21 ]. However, the cost of the inoculants, which are rare earth elements, leads to a considerable increase in the price of the powder.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rapid Heating and Cooling Conditions on Microstructure Formation in Powder Bed Fusion of Al-Si Hypoeutectic Alloy: A Phase-Field Study

2022

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Al alloy parts fabricated by powder bed fusion (PBF) have attracted much attention because of the degrees of freedom in both shapes and mechanical properties. We previously reported that the Si regions in Al-Si alloy that remain after the rapid remelting process in PBF act as intrinsic heterogeneous nucleation sites during the subsequent resolidification. This suggests that the Si particles are crucial for a novel grain refinement strategy. To provide guidelines for grain refinement, the effects of solidification, remelting, and resolidification conditions on microstructures were investigated by multiphase-field simulation. We revealed that the resolidification microstructure is determined by the size and number of Si regions in the initial solidification microstructures and by the threshold size for the nucleation site, depending on the remelting and resolidification conditions. Furthermore, the most refined microstructure with the average grain size of 4.8 µm is predicted to be formed under conditions with a large temperature gradient of Gsol = 106 K/m in the initial solidification, a high heating rate of HR = 105 K/s in the remelting process, and a fast solidification rate of Rresol = 10−1 m/s in the resolidification process. Each of these conditions is necessary to be considered to control the microstructures of Al-Si alloys fabricated via PBF.

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Improving creep resistance of Al-12 wt.% Ce alloy by microalloying with Sc

Cited by 49 publications

References 36 publications

Equiaxed Grain Formation by Intrinsic Heterogeneous Nucleation Via Rapid Heating and Cooling in Additive Manufacturing of Aluminum-Silicon Hypoeutectic Alloy

Equiaxed Grain Formation by Intrinsic Heterogeneous Nucleation Via Rapid Heating and Cooling in Additive Manufacturing of Aluminum-Silicon Hypoeutectic Alloy

Aluminum Cast Alloys Based on the Al–Ce–Si–Mg System: An Influence of Silicon on Crystallization, Phase Composition, and Tensile Properties

Effect of Rapid Heating and Cooling Conditions on Microstructure Formation in Powder Bed Fusion of Al-Si Hypoeutectic Alloy: A Phase-Field Study

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