Abnormally enhanced diamagnetism in Al-Zn-Mg alloys
Abnormally enhanced diamagnetism in Al-Zn-Mg alloys
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DOI：
10.1016/j.jallcom.2018.10.037
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发表时间：
2019-02
影响因子：
6.2
通讯作者：
K. Nishimura;K. Matsuda;Seungwon Lee;N. Nunomura;Tomoki Shimano;A. Bendo;Katsumi Watanabe;
中科院分区：
文献类型：
--
作者：
K. Nishimura;K. Matsuda;Seungwon Lee;N. Nunomura;Tomoki Shimano;A. Bendo;Katsumi Watanabe;
Al-1.0%Zn-4.2%Mg、Al-2.6%Zn-3.2%Mg、Al-4.1%Zn-1.1%Mg和Al-5%Zn（at.%）的磁化强度随温度和时间的变化关系在自然时效和峰值时效热处理的不同时期之后，在10和310 K之间的范围内测量合金。首次观察到淬火态Al-Zn-Mg合金的抗磁效应。Al-2.6%Zn-3.2%Mg和Al-4.1%Zn-1.1%Mg的抗磁性增强在自然时效过程中发生了较大的变化，而Al-1.0%Zn-4.2%Mg的抗磁性增强在自然时效过程中变化不大。峰时效处理后，Al-Zn-Mg合金的抗磁性大大降低。Al-5%Zn二元合金既没有表现出抗磁性增强作用，也没有自然时效效应。发现Al-Zn-Mg合金在300 K等温磁化强度随时间的变化与溶质-空位团簇有关。
Temperature and time dependences of magnetization of Al-1.0%Zn-4.2%Mg, Al-2.6%Zn-3.2%Mg, Al-4.1%Zn-1.1%Mg, and Al-5%Zn (at.%) alloys were measured in the range between 10 and 310 K after various periods of natural aging and peak-aged heat treatments. Enhanced diamagnetic contributions on the magnetization were observed for the as-quenched Al-Zn-Mg alloys for the first time. The enhanced diamagnetism observed in Al-2.6%Zn-3.2%Mg and Al-4.1%Zn-1.1%Mg were found to largely alter in natural aging, while that of Al-1.0%Zn-4.2%Mg little changed. After peak-aged heat treatments, the diamagnetism of Al-Zn-Mg was largely reduced. The binary Al-5%Zn showed neither enhanced diamagnetism nor natural aging effect on the magnetization. Isothermal time variations of magnetization of Al-Zn-Mg alloys at 300 K were found to be related with solute-vacancy clustering.