Chengpeng Xue

Beijing Institute of Technology

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Junsheng Wang

Beijing Anzhen Hospital

Shuo Wang

Northeast Normal University

Xinghai Yang

Beijing Institute of Technology

Guangyuan Tian

Beijing Institute of Technology

Yisheng Miao

Beijing Institute of Technology

Hui Su

Beijing Institute of Technology

Quan Li

Beijing Institute of Technology

Zhihao Yang

Zhengzhou University

Yanan Meng

Qingdao National Laboratory for Marine Science and Technology

Xingxing Li

Yunnan University

Cooperative Institutions

Beijing Institute of Technology

Chinese Academy of Sciences

Xi'an Jiaotong University

University of Chinese Academy of Sciences

University of Science and Technology Beijing

Northeastern University

University of Science and Technology of China

Tsinghua University

Peking University

Chongqing University

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The Effect of Point Defects on Young’s Modulus of the Off-Stoichiometric Al3X (X = Li, Sc, and Zr) Phases: A First-Principles Study

Metals (2023)

Yanan Meng Shuo Wang Hui Su Chi Zhang Bing Wang

L12-Al3X (X = Li, Sc, and Zr) precipitates are the main strengthened phases of high-strength aluminum alloys and are critical for aerospace structural materials. Point defects and substitutional ternary elements change the mechanical properties of Al3X. In this paper, the effect of point defects, including vacancy, antisite, and substitutional element addition defects on the elastic modulus of the off-stoichiometric Al3X (X = Li, Sc, and Zr) phase were investigated by using first-principle calculations. The formation enthalpies of the defective Al3X alloy and isolated point defects in Al3X were calculated, and the results showed that the defects have an effect on the structure and elasticity of the off-stoichiometric Al3X phases. The lattice distortion, elastic constants, and elastic moduli were further investigated. It was found that the point defects increased the Young’s modulus for Al3Zr, and the doping of Er improved the Young’s modulus for off-stoichiometric Al3Li and Al3Sc. Adjusting the position of vacancies can improve the elastic modulus. In addition, the doping of substitutional elements (especially Sc, Ti, Zr, Hf, Ta, Mn, Ir, and Cf) can greatly increase the Young’s modulus of off-stoichiometric Al3Li.

Stoichiometry

Lattice constant

10.3390/met14010030

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Citations (0)

Solute clustering governed elastic properties in aluminum

Calphad (2022)

Shuo Wang Chengpeng Xue Xinghai Yang Guangyuan Tian Hui Su

10.1016/j.calphad.2022.102494

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Citations (2)

Quantifying the Effects of Carbides and Pores on Fatigue Damages of Ni-Based Single Crystal Superalloys at Elevated Temperature Using X-Ray CT Scans

Journal of Nondestructive Evaluation (2022)

Keli Liu Chi Zhang Junsheng Wang Chengpeng Xue Bing Wang

10.1007/s10921-022-00877-y

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Citations (1)

Hydrogen microporosity evolution and dendrite growth during long solidification of Al-Cu-Li alloys: Modeling and experiment

Journal of Materials Processing Technology (2023)

Xingxing Li Xinghai Yang Chengpeng Xue Shuo Wang Yuxuan Zhang

Dendrite (mathematics)

10.1016/j.jmatprotec.2023.118135

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Citations (6)

Accelerating the dissolution and transformation of detrimental Fe-rich intermetallics in recycled Al-Mg-Si alloy by homogenization and hot deformation

Materials Characterization (2024)

Quan Li Junsheng Wang Xinxiu Liu Chengpeng Xue Shuo Wang

Homogenization

10.1016/j.matchar.2024.114024

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Citations (5)

Quantifying the Effects of Grain Refiners Al-Ti-B and La on the Microstructure and Mechanical Properties of W319 Alloy

Metals (2022)

Xinxiu Liu Bing Wang Quan Li Junsheng Wang Chi Zhang

It is well known that the microstructure distribution in recycled Al-Si alloys has a large impact on the final mechanical properties. In this study, the microstructure, including Fe-rich intermetallics and microporosity, was quantitatively adjusted using multi-scale characterization with microalloying rare earth elements and traditional grain refiners as the objects of study. It was found that the addition of Al-Ti-B to W319 recycled aluminum alloy reduces the microstructure size and Fe-rich intermetallics, while the addition of La facilitates the transformation of harmful β-Fe into less harmful particles and the densification of coarse eutectic Si, promoting the refining effects on the microstructure additionally. Therefore, the RE and Al-Ti-B master alloy could be a potential new grain refining agent, especially for Al-cast alloys when the ductility is critical for designing. The improvement in elongation far exceeds the original level, up to 69.6%, while maintaining the same level of strength or even better. At the same time, the excessive addition of La may lead to the depletion of Cu and Ti elements during heat treatment, degrading ductility and strength.

Ductility (Earth science)

Refining (metallurgy)

Elongation

10.3390/met12040627

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Citations (17)

Boosting the grain refinement of commercial Al alloys by compound addition of Sc

Journal of Materials Research and Technology (2023)

Quan Li Xinxiu Liu Junsheng Wang Chengpeng Xue Shuo Wang

For decades, Al–Ti–B has been widely used for refining commercial Al alloys. However, the addition of Al–Ti–B master alloys to recycled Al alloys suffers from Si-poisoning and cannot achieve desired refinement and thus final strength-ductility. In this study, a novel grain refiner made of Al–Ti–B-Sc has been developed and its application in refining recycled Al–Si–Cu alloys has been quantified using X-ray computed tomography (XCT). It has been found that the new Al–5Ti–1B-0.8Sc master alloy exceed the performance of Al–5Ti–1B in three aspects: (1) formation of Al3(Sc,Ti) heterogeneous nucleation particles other than Al3Ti; (2) dispersing TiB2 by forming TiB2/Al3(Sc,Ti) clusters and increasing Al melt viscosity; (3) reducing the specific surface area of Al3Ti to improve its high-temperature stability. Surprisingly, the compound addition of Sc has been found to further reduce the grain and Si particle size due to accelerated kinetics of α-Al nucleation and diminished Si poisoning. Therefore, this study proposes not only a new master alloy but also a new grain refinement method, which can effectively increase the tensile strength and elongation of recycled Al alloys up to 433.2 ± 10.5 MPa and 3.0 ± 0.1 %, respectively.

Refining (metallurgy)

Ductility (Earth science)

Elongation

10.1016/j.jmrt.2023.12.125

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Citations (10)

Uncovering the effects of local pressure and cooling rates on porosity formation in AA2060 Al-Li alloy

Materials Today Communications (2023)

Yuxuan Zhang Chengpeng Xue Xinghai Yang Xingxing Li Shuo Wang

Die casting

10.1016/j.mtcomm.2023.106384

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Citations (8)

Design of high strength and electrically conductive aluminium alloys by machine learning

Materials Science and Technology (2022)

Tingting Liang Junsheng Wang Chengpeng Xue Chi Zhang Mingshan Zhang

Traditionally, thermodynamic modeling considers only the equilibrium conditions and one-dimensional evolution of phases. Therefore, it has difficulty in predicting the final properties of materials, especially when the functional and mechanical properties are correlated and heavily dependent on the combination of different phases which distribute in three dimensions. Recently, machine learning enabled us to establish the complex relationship between alloy compositions, processing conditions, various phases, and final properties. In this work, machine learning is coupled with thermodynamic calculations to optimise the alloy compositions, processing conditions, and the combinations of phases for improved electrical conductivity and mechanical property. Compared with previous chemistry design by machine learning for multiple inputs and single object outputs, the introduction of intermediate phases from thermodynamic calculations can improve the prediction accuracy. Combining machine learning with thermodynamic calculation is expected to optimise new alloys.

10.1080/02670836.2022.2025560

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Citations (8)

In-situ study on the effect of Li concentration on hydrogen microporosity evolution in Al-Li alloys by synchrotron X-ray radiography

Journal of Alloys and Compounds (2024)

Xingxing Li Junsheng Wang Yisheng Miao Quan Li Chengpeng Xue

10.1016/j.jallcom.2024.176810

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Citations (0)