Critical concentrations of Zn and Mg for enhanced diamagnetism in Al-Zn-Mg alloys
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- Katsuhiko Nishimura
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Kenji Matsuda
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Taiki Tsuchiya
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Norio Nunomura
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Artenis Bendo
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Yosikazu Isikawa
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Kosuke Imai
- Graduate School of Science and Engineering, University of Toyama 1 , Gofuku, Toyama 930-8555, Japan
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- Hiroki Adachi
- Graduate School of Engineering, University of Hyogo 2 , Himeji 671-2280, Japan
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- Wayne D. Hutchison
- School of Science, The University of New South Wales 3 , Canberra, ACT 2600, Australia
説明
<jats:p>Temperature and time dependences of the magnetization of Al-Zn-Mg alloys with varying Zn to Mg ratios (Zn/Mg = 0.25, 0.5, 1, 2, 5.5, and 9, keeping the total concentration of Zn plus Mg to be 5 at. %) were studied in the range from 10 to 310 K after various periods of natural aging. In particular, for Al1−y(Mg2Zn11)y alloys, the total concentrations of Zn and Mg were also varied from 2 to 20 at. % (y = 0.02, 0.03, 0.04, 0.05, 0.1, and 0.2). The largest time variant enhanced diamagnetism was observed for Al0.95(Mg2Zn11)0.05 as a result of solution heat treatment/quenching and natural aging. Isothermal measurements of magnetization vs time for natural aging temperatures from 260 to 300 K for Al0.95(Mg2Zn11)0.05 provided activation energies for solute clustering: 0.69 ± 0.05 eV (for stages I and II) and 0.78 ± 0.03 eV (for stages II and III). The mechanical hardness vs time at 273 K for Al0.95(Mg2Zn11)0.05 confirmed that the time variation of magnetization was related to the precipitation process of Zn/Mg/vacancy zones. Additionally, temperature dependences of the magnetization of Mg21Zn25, Mg4Zn7, MgZn2, and Mg2Zn11 were examined. The observed magnetization for the Mg-Zn compounds was found to be too small to account for the enhanced diamagnetic contributions to magnetization of Al-Zn-Mg alloys. A possible Zn-Mg-vacancy atomic arrangement responsible for the enhanced diamagnetism is discussed.</jats:p>
収録刊行物
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- AIP Advances
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AIP Advances 9 (12), 2019-12-01
AIP Publishing