The effect of Fe doping on the crystallization kinetics of Ni-Mn-Sn free-standing alloy thin films
The effect of Fe doping on the crystallization kinetics of Ni-Mn-Sn free-standing alloy thin films
复制标题
Fe掺杂对Ni-Mn-Sn自支撑合金薄膜结晶动力学的影响
DOI：
10.1016/j.jnoncrysol.2018.05.008
复制
发表时间：
2018-09-01
影响因子：
3.5
通讯作者：
Cai, Wei
中科院分区：
文献类型：
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作者：
Tian, Xiaohua;Wang, Zhenhua;Cai, Wei
Fe掺杂对Ni-Mn-Sn合金薄膜晶化行为的影响是其应用的关键，但目前尚不清楚。采用差示扫描量热法（DSC）在非等温和等温条件下研究了Fe掺杂对Ni-Mn-Sn自支撑合金薄膜晶化动力学的影响。在非等温晶化条件下，Ni 50-xMn 39 Sn 11 Fe x（x = 0，0.5，2，4）自支撑合金薄膜的晶化峰温度随Fe含量的增加而升高。由Kissinger法确定的非晶态到晶化的表观活化能随Fe含量的增加而增加。用Doyle方法确定了反应的局部活化能。在等温结晶的情况下，结晶动力学模型由Johnson-Mehl-Avrami方程。计算的Avrami指数在1至1.5的范围内。局域Avrami指数表明Ni 50-xMn 39 Sn 11 Fex（x = 0，0.5，2，4）自支撑薄膜的晶化机制均由扩散控制的一维生长转变为扩散控制的二维和三维生长。
The exploration of Fe doping on crystallization behavior of Ni-Mn-Sn alloy thin films is crucial for its application, but remains unknown. Here, we investigated the effect of Fe doping on the crystallization kinetics of Ni-Mn-Sn free-standing alloy thin films by differential scanning calorimetry (DSC) in the mode of non-isothermal and isothermal conditions. In the case of non-isothermal crystallization, it is found that the crystallization peak temperatures of Ni50-xMn39Sn11Fex (x = 0, 0.5, 2, 4) free-standing alloy thin films increase with increasing Fe content. The apparent activation energy from the amorphous state to crystallization which determined by Kissinger's method increase with increasing Fe content. The local activation energy is determined by Doyle method. In the case of isothermal crystallization, the crystallization kinetics was modeled by the Johnson-Mehl-Avrami equation. The Avrami exponents were calculated to be in the range of 1 to 1.5. The local Avrami exponents indicating that the crystallization mechanism of Ni50-xMn39Sn11Fex (x = 0, 0.5, 2, 4) freestanding thin films is all from diffusion-controlled one-dimensional growth to diffusion-controlled two-dimensional and three-dimensional growth.