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RISS 인기검색어
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- 저자 : Kagan Sarlar (검색결과 2 건)
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Magnetocaloric properties in a FeNiGaMnSi high entropy alloy
Kagan Sarlar,Atakan Tekgül,Ilker Kucuk 한국물리학회 2020 Current Applied Physics Vol.20 No.1
We investigated a new Fe26.7Ni26.7Ga15.6Mn20Si11 high entropy alloy (HEA) without the rare earth element. The structural, magnetic and magnetocaloric properties of the resulting materials are presented. The HEAs successfully is produced by the arc melting with suction casting method. The crystal structures are characterised through multiphase Rietveld refinement of X-ray diffraction data. The structure of the HEAs was found to be the body centred cubic (bcc). In the magnetic measurements, the ferromagnetic to paramagnetic transition was obtained in the range of 300–400 K. With the employed suction casting method; the Fe26.7Ni26.7Ga15.6Mn20Si11 HEA shows the best magnetocaloric properties as 1.59 Jkg−1K−1 maximum magnetic entropy change (0–2 T) and 75.68 Jkg-1 refrigeration capacity after the annealing process.
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Ersin Civan,Kagan Sarlar,Ilker Kucuk 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
The effects of adding Gd on the Curie temperature (TC), glass-forming ability (GFA), and magnetocaloric effect (MCE) were studied in Fe68-xGdxTb₅B23Nb₄ (x = 0, 2, and 6) glassy alloys prepared by suction casting. It was shown that when Gd content was exchanged with Fe partially for x = 2, GFA was increased, whereas for x = 6, adding Gd content has reduced the GFA and amorphous structure could not be obtained. Critical diameter was found to be 3 ㎜ for Fe66Gd₂Tb₅B23Nb₄ bulk metallic glass (BMG). By exchanging Gd with Fe partially, TC could effectively be tuned in a quite broad temperature interval from 487 K (x = 0) to 380 K (x = 6) for which amorphous structure could not be obtained. Maximum magnetic entropy change (−ΔSM)<SUP>max</SUP> values were found to be 1.16, 0.84 Jkg<SUP>−1</SUP>K<SUP>−1</SUP>, and 0.54 J㎏<SUP>−1</SUP>K<SUP>−1</SUP> as well as, refrigeration capacity (RC) values were obtained as 116 J/㎏, 84.84 J/㎏, and 40.50 J/㎏ under a low field change of 2 T for x = 0, 2, and 6, respectively. Although TC was shifted to lower temperatures by exchanging Fe with Gd partially, −(ΔSM)<SUP>max</SUP> decreased almost half of the base alloy and RC decreased approximately 1/3 of the base alloy.
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