Critical concentrations of Zn and Mg for enhanced diamagnetism in Al-Zn-Mg alloys

被引：1

作者：

Nishimura, Katsuhiko ^{[1
]}

Matsuda, Kenji ^{[1
]}

Tsuchiya, Taiki ^{[1
]}

Nunomura, Norio ^{[1
]}

Bendo, Artenis ^{[1
]}

Isikawa, Yosikazu ^{[1
]}

Imai, Kosuke ^{[1
]}

Adachi, Hiroki ^{[2
]}

Hutchison, Wayne D. ^{[3
]}

机构：

[1] Univ Toyama, Grad Sch Sci & Engn, Gofuku, Toyama 9308555, Japan

[2] Univ Hyogo, Grad Sch Engn, Himeji, Hyogo 6712280, Japan

[3] Univ New South Wales, Sch Sci, Canberra, ACT 2600, Australia

来源：

AIP ADVANCES | 2019年 / 9卷 / 12期

关键词：

POSITRON-ANNIHILATION; SI; CU; LIFETIME; BEHAVIOR; KINETICS; ZONES; GE;

D O I：

10.1063/1.5126972

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 Al-0.95(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 Al-0.95(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 Al-0.95(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.

引用

页数：7

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