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Synthesis of Mg-based alloys with rare-earth element addition by means of mechanical alloying

Sabina Lesz Bartłomiej Hrapkowicz Klaudiusz Gołombek Małgorzata Karolus Patrycja Janiak
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 5 | e137586 | DOI: 10.24425/bpasts.2021.137586
Keywords mechanical alloying magnesium rare-earth element ytterbium
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Abstract

Magnesium-based alloys are widely used in the construction, automotive, aviation and medical industries. There are many parameters that can be modified during their synthesis in order to obtain an alloy with the desired microstructure and advantageous properties. Modifications to the chemical composition and parameters of the synthesis process are of key importance. In this work, an Mg-based alloy with a rare-earth element addition was synthesized by means of mechanical alloying (MA). The aim of this work was to study the effect of milling times on the Mg-based alloy with a rare-earth addition on its structure and microhardness. A powder mixture of pure elements was milled in a SPEX 8000D high energy shaker ball mill under an argon atmosphere using a stainless steel container and balls. The sample was mechanically alloyed at the following milling times: 3, 5, 8 and 13 h, with 0.5 h interruptions. The microstructure and hardness of samples were investigated. The Mg-based powder alloy was examined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and using a Vickers microhardness test. The results showed that microhardness of the sample milled for 13 h was higher than that of those with milling time of 3, 5 and 8 h.
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Authors and Affiliations

Sabina Lesz
1
ORCID: ORCID
Bartłomiej Hrapkowicz
1
ORCID: ORCID
Klaudiusz Gołombek
1
ORCID: ORCID
Małgorzata Karolus
2
ORCID: ORCID
Patrycja Janiak
1
  1. Department of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18A, 44-100, Gliwice, Poland
  2. Institute of Materials Engineering, University of Silesia, ul. 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland

Tunable Q-switched ytterbium-doped fibre laser by using zinc oxide as saturable absorber

R.A. Shaharuddin S.A. Azzuhri M.A. Ismail F.A.A. Rashid M.Z. Samion M.Z.A. Razak H. Ahmad
Opto-Electronics Review | 2017 | vol. 25 | No 1 | 10-14
Keywords Tunable Q-switched ZnO Tunable bandpass filter Ytterbium
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Abstract

This paper demonstrates the use of a zinc oxide (ZnO) thin film in a 1-μm ring laser cavity as a saturable absorber to successfully generate Q-switching pulses. The tunability of the laser pulses is achieved by integrating a tunable bandpass filter (TBPF) in an ytterbium-doped laser cavity that results in 9.4 nm of tuning range, which wavelength is from 1040.70 nm to 1050.1 nm. The peak energy in the pulse which is 1.47 nJ was measured together with a minimum pulse width of 2.4 μs. In addition, the repetition rate increases from 25.77 to 45.94 kHz as the pump power level being increased from 103.1 to 175.1 mW. The results obtained in this experiment demonstrated consistent results and stable throughout the experiment. Therefore, ZnO thin film is considered as a good candidate in 1-μm pulsed laser applications.

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Authors and Affiliations

R.A. Shaharuddin
S.A. Azzuhri
M.A. Ismail
F.A.A. Rashid
M.Z. Samion
M.Z.A. Razak
H. Ahmad

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