High-temperature order-disorder phase transition in Fe-18Ga alloy evaluated by internal friction method
High-temperature order-disorder phase transition in Fe-18Ga alloy evaluated by internal friction method
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内摩擦法评价Fe-18Ga合金高温有序-无序相变
DOI：
10.1016/j.jallcom.2018.04.062
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发表时间：
2018-06
影响因子：
6.2
通讯作者：
Changsong Liu
中科院分区：
文献类型：
--
作者：
Meng Sun;Xianping Wang;Le Wang;Hui Wang;Weibin Jiang;Wang Liu;Ting Hao;Rui Gao;Yunxia Gao;Tao Zhang;Li Wang;Qianfeng Fang;Changsong Liu
系统分析了Fe-18Ga合金的结构、内耗行为、电阻率和磁致伸缩性能。在Fe-18Ga合金从室温(RT)到800 °C的IF谱中，除了报道的与中温400 °C-530 °C晶界弛豫有关的IF峰外，还在530 °C-690 °C的高温范围内观察到一个显著的IF峰(标记为Ptr峰)，其峰位几乎不随测量频率的变化而变化，暗示其机制很可能与相变有关。从宽峰的形状来看，Ptr峰可以分解为两个组分：较低温度的Ptr1峰位于530 °C-605 °C附近，较高温度的Ptr2峰位于605 °C-690 °C附近。结合计算的相图、电阻率和磁致伸缩分析，认为Ptr峰的产生机制源于Fe-18Ga合金中与Ga原子分布有关的有序-无序相变：Ptr1峰属于D03→B2相变，Ptr2峰属于B2→A2相变。
The structure, internal friction (IF) behavior, resistivity and magnetostriction property of Fe-18Ga alloy were systematically analyzed in this investigation. In the IF spectra of Fe-18Ga alloy covered from room temperature (RT) to 800 °C, a prominent IF peak (labeled asPtrpeak) was observed in the high temperature range 530 °C–690 °C besides the reported IF peak related with grain boundary relaxation in the moderate temperature range 400 °C–530 °C. The peak position ofPtrpeak hardly changes with measuring frequency, implying that its mechanism is most possibly related with phase transition. Considering from the wide peak shape,Ptrpeak can be decomposed into two components: the lower temperaturePtr1peak located around 530 °C–605 °C and the higher temperaturePtr2peak located around 605 °C–690 °C. Combined with calculated phase diagram, resistivity and magnetostriction analysis, the mechanism ofPtrpeak was suggested to originate from the order-disorder phase transition related with Ga atom distribution in Fe-18Ga alloy:Ptr1peak was ascribed to D03→B2 transition andPtr2peak was ascribed to B2→A2 transition, respectively.
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