Internal friction phenomena in a wide temperature range up to 800°C in long-term annealed Fe-(0−30) at% Ga alloys
Internal friction phenomena in a wide temperature range up to 800°C in long-term annealed Fe-(0−30) at% Ga alloys
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DOI：
10.1016/j.jallcom.2021.161444
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发表时间：
2021-12
影响因子：
6.2
通讯作者：
Meng Sun;Lan Li;Weibin Jiang;Yunxia Gao;Hui Wang;Xianping Wang;Qianfeng Fang
中科院分区：
文献类型：
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作者：
Meng Sun;Lan Li;Weibin Jiang;Yunxia Gao;Hui Wang;Xianping Wang;Qianfeng Fang
在480 °C热处理14天，系统研究了Fe-(0−30)at% Ga合金在室温（RT）至800 °C范围内的内摩擦现象，包括磁相关高阻尼平台（HDP）和铁顺磁转变点（Tc）、晶界弛豫、齐纳弛豫以及与相变相关的中频峰。结果表明，随着Ga含量的增加，HDP的快速衰减温度降低，这与居里点（Tc）的变化规律一致；当Ga含量大于18 %时，HDP消失。在长期退火的Fe-30at%Ga合金中，观察到一个与频率无关的相变IF峰，其机制为L12→A2/B2相变。中频技术评价的Fe-(0-30 at%)Ga合金的相变与平衡相图吻合较好。此外，在L12→d019和L12→A2/B2位移相变前出现了一个新的弛豫峰，其机制可能与FCC结构L12相的齐纳弛豫有关。
The internal friction (IF) phenomena were systematically studied in a temperature range from room temperature (RT) to 800 °C for Fe-(0−30) at% Ga alloys annealed at 480 °C for 14 days, which include the magnetic-related high damping plateau (HDP) and the point of ferro-paramagnetic transition (Tc), grain boundary relaxations, Zener relaxations, and the IF peaks associated with phase transitions. It was found that the rapid decay temperature of the HDP decreases with increasing Ga content, which is consistent with the variation of the Curie point (Tc), and the HDP disappears when the Ga content is greater than 18 at%. In the long-term annealed Fe-30at%Ga alloy, a frequency-independent phase transition IF peak was observed and its mechanism was suggested as the phase transition of L12→A2/B2. The phase transitions in Fe-(0–30 at%)Ga alloys evaluated by the IF technique are in good agreement with the equilibrium phase diagram. In addition, a new relaxation peak was observed before the displacive phase transitions of L12→D019and L12→A2/B2, and its mechanism could be related to Zener relaxation in the FCC structured L12phase.