Effects of scandium addition on microstructure, mechanical and thermal properties of cast Be-Al alloy

Yu, Liangbo; Wang, Jing; Qu, Fengsheng; Wang, Min; Wang, Wenyuan; Bao, Yi; Lai, Xinchun

doi:10.1016/j.jallcom.2017.12.117

Cited by 35 publications

(4 citation statements)

References 43 publications

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“…%, while Al is virtually insoluble in Be, and the solubility between them is extremely limited. Therefore, in previous studies [4][5][6], it is considered that Be-Al alloy is a kind of composite material with discontinuous granular Be phase reinforcing Al matrix.…”

Section: Opinionmentioning

confidence: 99%

Research Progress of Be-Al Alloys

Wang

2023

AMMS

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Section: Opinionmentioning

confidence: 99%

Research Progress of Be-Al Alloys

Wang

2023

AMMS

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“…Fortunately, in the past few decades, related researchers have found that by adding appropriate transition elements (TMs) and rare earth elements (REs) to Al alloys, the L1 2 ordered binary precipitated phases can be produced with the appropriate heat treatment, namely, Al 3 TM and Al 3 RE intermetallic compounds. These binary intermetallics have excellent mechanical properties such as high specific strength, good elastic properties, and plasticity [10][11][12], as well as excellent physical properties such as a high melting point, good oxidation resistance, good thermal stability, and low mass density [13][14][15][16][17][18][19][20][21][22][23][24][25], thereby improving the creep resistance and thermal conductivity of Al alloys even at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Substitutional Defects of Transition Metal Elements on the Stability and Thermal Properties of Al at Finite Temperatures: A First-Principles Study

Ye,

Lin,

Ruan

et al. 2023

Crystals

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Based on first-principles calculations, the effects of substitutional defects of the 3d–5d transition metal elements TMAl on the stability and thermal conductivity of the aluminum matrix were investigated. The results show that with an increase in the atomic number of TM, the defect-forming energy Ef of TMAl exhibits a periodic change feature, which depends on the valence electron configuration of the TM elements. The thermodynamic property parameters calculated with the Debye theory show that the addition of TM atoms does not change the stability of an Al system and can effectively reduce the thermal expansion coefficient of the material. But the equilibrium lattice constant a0 of Al-TMAl supercells changes very little. As the temperature increases, the relaxation time τ decreases, and both the electronic thermal conductivity κe and the total thermal conductivity κ decrease at the temperature range of 100–200 K, followed by a small increase or decrease. Because the lattice thermal conductivity κl is very small in the whole temperature range, the changes in electronic thermal conductivity and total thermal conductivity are basically the same. Moreover, when 1 at.% TM was added at both 300 K and 600 K, it was found that the influence of TM solute atoms on the thermal conductivity κ of Al was much greater than that of the second-phase particles. For solid solution atoms, Pd and Pt atoms have the greatest influence on the thermal conductivity of pure Al. This work is helpful for designing high-performance, heat-resistant Al-based alloys.

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“…Ag, Cr, Cu, Hf, Li, Sc, Zr, and Mg are likely to experience a noticeable solubility in Al; meanwhile, Au, Cu, Fe, Co, Ni, and Pd have a noticeable solubility in Be [5,6] . Many researchers have investigated the effect of adding elements on the properties of Be-Al alloy [7][8][9][10][11] . When Ag element is added, the electric charges are redistributed, which increases the density of electric charges across the interface.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ag, Co, and Ge additions on microstructure and mechanical properties of Be-Al alloy fabricated by investment casting

et al. 2022

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The effects of Ag, Co, and Ge additions on microstructure and mechanical properties of alloys fabricated by investment casting were studied. The results reveal that the trace metals 1.5wt.% Ag, 0.7wt.% Co, and 0.8wt.% Ge additions do not change the nucleation temperature of Be phase. However, the nucleation temperature of the Al phase decreases from 642 °C to 630 °C by DSC due to the Ge addition. The strength of the alloys sharply increases due to the dissolution of the Ag and Ge solutes into the Al phase and the Co into the Be phase characterized by SEM and EDS. Obviously, the strength of Be-Al-Ag-Co-Ge alloy is improved by the solution strengthening. Furthermore, a few Ag 3 Al particles contribute to the strength of the Al phase. Be-Fe-Al ternary intermetallic compounds which can effectively reduce the negative effect of an impurity element Fe on the mechanical properties of Be-Al alloys are also found by XRD and EDS.

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Effects of scandium addition on microstructure, mechanical and thermal properties of cast Be-Al alloy

Cited by 35 publications

References 43 publications

Research Progress of Be-Al Alloys

Research Progress of Be-Al Alloys

The Influence of Substitutional Defects of Transition Metal Elements on the Stability and Thermal Properties of Al at Finite Temperatures: A First-Principles Study

Effects of Ag, Co, and Ge additions on microstructure and mechanical properties of Be-Al alloy fabricated by investment casting

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