Microstructural evolution and hardness of as-cast Be-Al-Sc-Zr alloy processed by laser surface remelting

Xu, Qingyu; Luo, Yang; Liu, Xiangdong; Liu, Yang; He, Simin; Wang, Xin; Wang, Wenyuan; Shi, Tao; Li, Ruiwen; Zhang, Pengcheng

doi:10.1016/j.cja.2020.06.005

Cited by 12 publications

(4 citation statements)

References 46 publications

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“…4, and σ my is the yield strength of the Al matrix [32,33] . The volume fraction of the Be is 67.36% of Be-Al alloy, which is close to the result from previous studies [34,35] . The composite yield strength σ cy is directly determined by the yield strength of Al alloy matrix σ my [25] from Eq.…”

Section: Mechanical Propertiessupporting

confidence: 91%

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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Section: Mechanical Propertiessupporting

confidence: 91%

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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“…After laser surface remelting, the full width at half maximum of the highest diffraction peak of the as-cast AlCoCrFeNi 2.1 HEA and 750 W remelted layer are 0.166 and 0.223, respectively, and according to the Debyb-Scherrer formula it is known that the grain size is inversely proportional to the full width at half maximum of the diffraction peak, and the narrower the full width at half maximum of the diffraction peak, the larger the grain size. After laser surface remelting treatment, the grains are significantly refined, which is due to the great cooling rate of the melt pool after laser removal, up to 10 5 -10 8 K/s, and the grains do not have enough time to grow in order to solidify [14].…”

Section: Phase Analysismentioning

confidence: 99%

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Chen

Zhang

et al. 2022

Metals

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In this study, laser surface remelting of an AlCoCrFeNi2.1 high-entropy alloy was performed using a Yb:YAG laser. The effects of laser surface remelting on the phase structure, microstructure, Vickers hardness, frictional wear properties, and corrosion resistance of the high-entropy alloy were investigated. The remelted layer of the AlCoCrFeNi2.1 high-entropy alloy was produced by remelting at 750 W laser power and formed a good metallurgical bond with the substrate. The X-ray diffraction results showed that the 750 W remelted layer consisted of face-centered cubic and body-centered cubic phases, which were consistent with the phases of the as-cast AlCoCrFeNi2.1 high-entropy alloy, and a new phase was not generated within the remelted layer. Laser surface remelting is very effective in refining the lamellar structure, and the 750 W remelted layer shows a finer lamellar structure compared to the matrix. The surface hardness and wear resistance of the AlCoCrFeNi2.1 high-entropy alloy were substantially improved after laser surface remelting. In a 3.5 wt.% NaCl solution, the laser-remelted surface had a larger self-corrosion potential and smaller self-corrosion current density, and the corrosion resistance was better than that of the as-cast high-entropy alloy.

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“…Laser surface remelting is a widely used technique to increase the hardness and wear resistance of metal materials. For instance, the microstructure of as-cast beryllium-aluminum alloy was refined by laser surface remelting, resulting in an increase in the hardness of the specimens when compared to the as-cast alloy (Xu et al , 2021).…”

Section: Introductionmentioning

confidence: 99%

Differentiated SnSb grain size distribution for improved tribological properties of Babbitt alloy

Guo

Ren

et al. 2023

ILT

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Purpose The grain size and grain distribution mode have a significant impact on the tribological properties of Babbitt alloy. The purpose of this paper is to study the effect of differentiated SnSb grain size distribution on the improvement of tribological properties of Babbitt alloy. Design/methodology/approach Babbitt (marked by babbitt-cr), with a differentiated SnSb grain size distribution, was fabricated using a selective zone laser surface treatment. Bare Babbitt with coarse SnSb grain was marked as babbitt-c, and Babbitt with refined SnSb grain was marked as babbitt-r. The microstructure, microhardness and wettability of specimens were tested. The tribological properties of babbitt-c, babbitt-r and babbitt-cr were evaluated under dry and lubricated conditions. Findings The microstructure transforms from single coarse SnSb grain distribution or single refined SnSb grain distribution to differentiated SnSb grain size distribution, as a result of selective zone laser surface treatment. Among three specimens of microhardness, babbitt-cr showed the highest microhardness. The lipophilicity property of babbitt-cr was better compared to babbitt-c. A mixture of coarse and refined grain is beneficial to improve the tribological properties of Babbitt alloy under dry condition. Furthermore, compared with babbitt-c, the wear resistance of babbitt-cr was enhanced under lubricated condition. However, the anti-wear property of babbitt-cr was not significantly improved relative to babbitt-r with an increase in the loads. Originality/value The study demonstrates that modulated different grain size alternating distribution modes can improve the tribological properties of Babbitt alloy. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-09-2022-0259/

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Microstructural evolution and hardness of as-cast Be-Al-Sc-Zr alloy processed by laser surface remelting

Cited by 12 publications

References 46 publications

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

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

Microstructure and Properties of Laser Surface Remelting AlCoCrFeNi2.1 High-Entropy Alloy

Differentiated SnSb grain size distribution for improved tribological properties of Babbitt alloy

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