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Study of non-linear kinetics of order-disorder transition with compositional modulation

成分调制有序-无序转变的非线性动力学研究

基本信息

批准号：
59420039
负责人：
YOSHINAGA Hideo
金额：
$ 16.7万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59420039/
关键词：
order disorder transition compositional modulation phase separation non linear kinetics precipitation spindal composition solid solution 固溶体統計熱力学

项目摘要

Kinetics of the order-disorder transition with compositional modulation was studied with the non-linear kinetic equation which had been improved by the present workers. The equation was solved for the instability of an order phase. It was expected from the features of the solutions that in some off.stoichiometric alloys an ordering tends to enhance compositional modulation. In order to confirm the conjecture, the process of ordering and phase separation in Fe-Al alloys was investigated intensively by X-ray diffraction and electron microscopy. It was observed that the behaviors of spinodal decomposition and precipitation in <DO_3> phase depend strongly upon the initial size of antiphase domains in agreement with the theoretical expectation. The heterogeneous ordering process in CuPt was observed in atomic scale with a field-ion microscope, and the growth kinetics of order domains was found to be correlated with the degree of order within the domains and the domain size. The phenomenon was explained successfully with another simple equation. A spinodal decomposition enhanced by electron irradiation was first recognized in an Fe-Mo alloy. This was also explained well in terms of a non-linear effect of point-defects introduced by irradiation. From the theoretical and the experimental results mentioned above, it is concluded that the correlation between elemental processes, which corresponds to a non-linear term in a kinetic equation, plays a quite important role in the order-disorder transition with compositional modulation.

利用作者改进的非线性动力学方程研究了组分调制下有序-无序转变的动力学。该方程求解了有序相的不稳定性。从溶液的特征可以预期，在某些非化学计量比合金中，有序化倾向于增强成分调制。为了证实这一猜想，我们利用X射线衍射和电子显微镜对Fe-Al合金的有序化和相分离过程进行了深入的研究。结果表明，亚稳分解和相内沉淀行为<DO_3>强烈依赖于反相畴的初始尺寸，与理论预期一致。用场离子显微镜在原子尺度上观察了CuPt中的非均匀有序过程，发现有序畴的生长动力学与畴内有序度和畴的大小有关。用另一个简单的方程成功地解释了这一现象。电子辐照促进的亚稳分解是在Fe-Mo合金中首次发现的。这也很好地解释了辐照引入的点缺陷的非线性效应。从上述理论和实验结果可以得出结论，在具有组分调制的有序-无序转变过程中，对应于动力学方程中的非线性项的元素过程之间的相关性起着相当重要的作用。