Chemical ordering phase transitions in Ni–Fe nanoalloys
Chemical ordering phase transitions in Ni–Fe nanoalloys
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DOI：
10.1088/0022-3727/44/13/135402
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
P. Y. Li;H. M. Lu;Z. Jiang;Y. N. Huang;X. Meng
中科院分区：
文献类型：
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作者：
P. Y. Li;H. M. Lu;Z. Jiang;Y. N. Huang;X. Meng
采用差示扫描量热法（DSC）、力学谱（MS）、振动样品磁强计（VSM）和热力学计算研究了Ni 75 Fe 25和Ni 70 Fe 30纳米合金的化学有序相变。在MS测量过程中，在平均晶粒尺寸为23 nm直径的Ni 75 Fe 25纳米合金中，在646 K处出现内耗峰。纳米合金的DSC测试中出现了一个放热峰。结合热力学预测和VSM测量结果，证实了放热峰和内耗峰均源于化学有序相变。相对于电子衍射和X射线衍射的不足，DSC、MS、VSM和热力学预测是研究Ni-Fe纳米合金化学有序相变的有效途径。
The chemical ordering phase transitions in Ni75Fe25 and Ni70Fe30 nanoalloys are investigated by differential scanning calorimetry (DSC), mechanical spectroscopy (MS), vibrating sample magnetometer (VSM) measurements and thermodynamical calculation. An internal friction peak occurs at 646 K in the Ni75Fe25 nanoalloy with an average grain size of 23 nm diameter during MS measurement. An exothermic peak appears during the DSC tests of nanoalloys. Associated with the results of thermodynamical prediction and VSM measurements, both the exothermic peak and the internal friction peak are convinced to be originated from chemical ordering phase transition. Compared with inefficacy of electron diffraction and x-ray diffraction, it is an effective route of employing DSC, MS, VSM and thermodynamical prediction in investigating the chemical ordering phase transitions in Ni–Fe nanoalloys.