Kinetics of phase transitions in equiatomic CuAu
Kinetics of phase transitions in equiatomic CuAu
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等原子 CuAu 的相变动力学
DOI：
10.1103/physrevb.60.14675
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发表时间：
1999
影响因子：
3.7
通讯作者：
K. Ludwig
中科院分区：
文献类型：
--
作者：
O. Malis;K. Ludwig
详细的有序动力学在等原子的CuAu使用原位时间分辨X射线散射研究。一个微妙的竞争之间的调制CuAu II相和简单有序的CuAu I相被发现发生在整个CuAu I/CuAu II相边界。还研究了有序化和四方晶格畸变之间的相关性，特别是从异质非相干成核到四方晶格连续、相干生长的交叉。发现后期粗化过程服从预期的${t}^{1/2}$生长规律，但在高温下，动力学减慢，可能是由于两个有序相之间的竞争或晶粒与畴界之间的相互作用。
The detailed ordering kinetics in equiatomic CuAu was studied using in situ time-resolved x-ray scattering. A subtle competition between the modulated CuAu II phase and the simple ordered CuAu I phase was found to occur across the CuAu I/CuAu II phase boundary. The correlation between ordering and the tetragonal distortion was also investigated, in particular the crossover from a heterogeneous incoherent nucleation to a continuous, coherent growth of the tetragonal lattice. The late stage coarsening process was found to obey the expected ${t}^{1/2}$ growth law but at high temperatures the kinetics is slowed down, possibly by the competition between the two ordered phases or the interaction between grain and domain boundaries.