Microstructure, mechanical properties and bonding characteristic of deformed tungsten

Zhang, Xiaoxin; Yan, Qingzhi; Yang, Chuntian; Wang, Tongnian; Chen, Ge

doi:10.1016/j.ijrmhm.2013.12.006

Cited by 18 publications

(2 citation statements)

References 22 publications

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“…In the first stage of ductile–fragile powders milling, the ductile particles (Fe, Co) exhibited plastic deformation, while the brittle particles ( RE 2 O 3 ) exhibited fragmentation. After the welding of the ductile particles, the fragile particles are placed between ductile particles at the collision time [ 32 ]. The fragmented particles are placed in the interfacial boundaries of the welded particles during effective high-energy ball milling.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Magnetic Properties of Fe0.65Co0.35 Nanoparticles by Compositing with RE2O3 (RE = La, Nd, and Sm)

Djellal¹,

Pęczkowski

Mekki

et al. 2022

Materials

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Fe‒Co alloys are the most important soft magnetic materials, which are successfully used for a wide range of applications. In this work, the magnetic properties of lanthanide-substituted (Fe0.65Co0.35)0.95(RE2O3)0.05 (RE = La, Nd, and Sm) nanoparticles, prepared by mechanical alloying, are reported. Our comprehensive studies (X-ray diffraction, Mössbauer spectroscopy, scanning electron microscopy with X-ray energy dispersive spectrometry, SQUID magnetometry and differential scanning calorimetry) have revealed different properties, depending on the dopant type. The RE2O3 addition led to a decrease in the crystallite size and to an increase in the internal microstrain. Moreover, because of the high grain fragmentation tendency of RE2O3, the cold welding between Fe–Co ductile particles was minimized, indicating a significant decrease in the average particle size. The parent Fe0.65Co0.35 alloy is known for its soft ferromagnetism. For the La-substituted sample, the magnetic energy product was significantly lower (0.450 MG.Oe) than for the parent alloy (0.608 MG.Oe), and much higher for the Sm-substituted compound (0.710 MG.Oe). The processing route presented here, seems to be cost-effective for the large-scale production of soft magnetic materials.

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Section: Resultsmentioning

confidence: 99%

Tailoring Magnetic Properties of Fe0.65Co0.35 Nanoparticles by Compositing with RE2O3 (RE = La, Nd, and Sm)

Djellal¹,

Pęczkowski

Mekki

et al. 2022

Materials

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“…[ 69,74,75 ] Notably, some studies showed that when

η < 0.3

, DRV is the main softening mechanism during thermoplastic deformation; when

0.3 \leq η \leq 0.6

, DRX is the main softening mechanism; and when

η \geq 0.6

, superplastic deformation is the main softening mechanism. [ 76,77 ] Therefore, the processing parameters for the experimental steel were chosen as follows: 900–1050 °C and 0.01–1 s −1 (i.e., outside the instability region (purple color) and inside the stable region (green color) on the processing map). These findings will also provide guidance for developing an optimal flexible rolling process.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Recrystallization Behavior of Low‐Carbon Steel during the Flexible Rolling Process: Modeling and Characterization

Liu

Mapelli

Peng

et al. 2021

steel research int.

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Dynamic recrystallization (DRX) is the predominant softening mechanism under high‐temperature large‐plastic deformation and determines the microstructure evolution of steel. Herein, an equivalent substitution method is proposed to investigate the coupling effect of deformation conditions on microstructural evolution during the flexible rolling process. Low‐carbon steel is compressed using a Gleeble 3800‐GTC thermal–mechanical physical simulation system at temperatures ranging from 900 to 1100 °C and strain rates ranging from 0.01 to 10 s−1. The flow stress behaviors under different deformation conditions are discussed. Accordingly, the relationship between strain rate and temperature is established using the Zener–Hollomon equation. Further, a new DRX model is proposed by combining the theoretical implications of previous models. The effectiveness of the experimental model and predicted model is statistically evaluated to accurately determine the DRX volume fraction of the experimental steel. Based on the dynamic material model, a hot processing map of the experimental steel is also developed to evaluate the steel's hot workability. Finally, the microstructure of the experimental steel is analyzed under specific deformation parameters. The results demonstrate that DRX behavior decreases as the upper roller is raised and the lower roller is lowered during the flexible rolling process.

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Microstructure and mechanical properties of spark plasma-sintered La2O3 dispersion-strengthened W–Ni–Fe alloy

et al. 2020

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Microstructure, mechanical properties and bonding characteristic of deformed tungsten

Cited by 18 publications

References 22 publications

Tailoring Magnetic Properties of Fe0.65Co0.35 Nanoparticles by Compositing with RE2O3 (RE = La, Nd, and Sm)

Tailoring Magnetic Properties of Fe0.65Co0.35 Nanoparticles by Compositing with RE2O3 (RE = La, Nd, and Sm)

Dynamic Recrystallization Behavior of Low‐Carbon Steel during the Flexible Rolling Process: Modeling and Characterization

Microstructure and mechanical properties of spark plasma-sintered La2O3 dispersion-strengthened W–Ni–Fe alloy

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