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The Effect of Transition Metals on Quasicrystalline Phase Formation in Mechanically Alloyed Al65Cu20Fe15 Powder

M. Mitka D. Kalita Anna Góral L. Lityńska-Dobrzyńska
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 3 | 1129-1133 | DOI: 10.24425/amm.2020.133229
Keywords mechanical alloying quasicrystal Al-Cu-Fe transition metals
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Abstract

The effect of replacing iron with transition metals (M = Mn, Cr, Co) on the microstructure of mechanically alloyed Al65Cu20Fe15 quasicrystalline powder was examined by X-ray diffraction and transmission electron microscopy methods. Powders of various compositions were milled in a high-energy planetary ball mill up to 30 hours at a rotation speed 350 rpm using WC milling media. The amount of the fourth additions was constant in all powders and Fe atoms were replaced with Mn, Cr or Co in a 1:1 ratio, while the content of the Al and Cu was selected in two ways: they remained the same as in the initial ternary Al65Cu20Fe15 alloy or changed to obtain e/a ratio = 1.75 (optimal for icosahedral quasicrystalline phase). Quasicrystalline phase formed in the quaternary Al65Cu20Fe7.5M7.5 powders, whereas in the second group of compositions only crystalline phases were identified.

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Authors and Affiliations

M. Mitka
D. Kalita
Anna Góral
L. Lityńska-Dobrzyńska

Effects of Transition Metal Carbides on Microstructure and Mechanical Properties of Ultrafine Tungsten Carbide Via Spark Plasma Sintering

Jeong-Han Lee Ik-Hyun Oh Hyun-Kuk Park
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1029-1032 | DOI: 10.24425/amm.2021.136419
Keywords WC cemented carbide transition metal carbide spark plasma sintering grain growth inhibitor hardness
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Abstract

WC-Co cemented carbides were consolidated using spark plasma sintering in the temperature 1400°C with transition metal carbides addition. The densification depended on exponentially as a function of sintering exponent. Moreover, the secondary (M, W)Cx phases were formed at the grain boundaries of WC basal facet. Corresponded, to increase the basal facets lead to the plastic deformation and oriented grain growth. A higher hardness was correlated with their grain size and lattice strain. We suggest that this is due to the formation energy of (M, W)Cx attributed to inhibit the grain growth and separates the WC/Co interface.
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Bibliography

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Authors and Affiliations

Jeong-Han Lee
1
ORCID: ORCID
Ik-Hyun Oh
1
ORCID: ORCID
Hyun-Kuk Park
1
ORCID: ORCID
  1. Korea Institute of Industrial Technology, Smart Mobility Materials and Components R&D Group, 6, Cheomdan-gwa giro 208-gil , Buk-gu, Gwang-Ju,61012, Korea

Tunable passively Q-switched ytterbium-doped fiber laser using MoWS2/rGO nanocomposite saturable absorber

J. Mohanraja V. Velmuruganb S. Sivabalanc
Opto-Electronics Review | 2019 | vol. 27 | No 1 | 18-24
Keywords Transition metal dichalcogenides Q-switched fiber laser Molybdenum Tungsten disulfide Saturable absorber
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Abstract

We demonstrated a tunable Q-switched ytterbium-doped fiber laser (YDFL) using MoWS2/rGO nanocomposite as passive saturable absorber. Further, the Mo1−xWxS2/rGO nanosheets, with x proportion of 0.2, are synthesized using hydrothermal exfoliation technique. The proposed nanocomposite-PVA based thin film is fabricated by mixing the MoWS2/rGO nanosheets with polyvinyl alcohol (PVA). The fabricated thin film is sandwiched between two fiber ferrules to realize the proposed saturable absorber (SA). Further, the proposed MoWS2/rGO-PVA based thin film SA exhibits a fast relaxation time and a high damage threshold which are suitable to realize a Q-switched pulsed laser with a tunable wavelength range of 10  nm that extends from 1028 nm to 1038 nm. For the highest pump power of 267.4 mW, the generated Q-switched pulses exhibit a narrow pulse width of 1.22 μs, the pulse repetition rate of 90.4 kHz, the highest pulse energy of 2.13  nJ and its corresponding average power of 0.193 mW. To the best of author’s knowledge, this is the first realization of a tunable Q-switching fiber laser in a 1 μm wavelength using MoWS2/rGO nanocomposite saturable absorber.

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Authors and Affiliations

J. Mohanraja
V. Velmuruganb
S. Sivabalanc

Corrigendum to "Van der Waals materials for HOT infrared detectors: A review"

Antoni Rogalski
Opto-Electronics Review | 2022 | 30 | 2 | e141441 | DOI: 10.24425/opelre.2022.141441
Keywords HgCdTe photodiodes transition metal dichalcogenides photodetectors high operating temperature infrared detectors 2D material photodetectors
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Abstract


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Authors and Affiliations

Antoni Rogalski
1
ORCID: ORCID
  1. Institute of Applied Physics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

Van der Waals materials for HOT infrared detectors: A review

Antoni Rogalski
Opto-Electronics Review | 2022 | 30 | 1 | e140551 | DOI: 10.24425/opelre.2022.140551
Keywords 2D material photodetectors transition metal dichalcogenides photodetectors HgCdTe photodiodes high operating temperature infrared detectors
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Abstract

In the last decade several papers have announced usefulness of two-dimensional materials for high operating temperature photodetectors covering long wavelength infrared spectral region. Transition metal dichalcogenide photodetectors, such as PdSe 2/MoS 2 and WS 2/HfS 2 and WS 2/HfS 2 heterojunctions, have been shown to achieve record detectivities at room temperature (higher than HgCdTe photodiodes). Under these circumstances, it is reasonable to consider the advantages and disadvantages of two-dimensional materials for infrared detection. This review attempts to answer the question thus posed.
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Authors and Affiliations

Antoni Rogalski
1
ORCID: ORCID
  1. Institute of Applied Physics, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland

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