AbstractThe dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x ($3 \leq x \leq 10$, at.%) alloys are studied using the microscopic phase-field dynamic model. The microelasticity field is incorporated into the diffusion dynamic model. The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates, the particles aligning along the dominant directions, the average domain size (ADS) of L12 and D022 deviating from the exponent of temporal power-law, and the growth slowing down due to the increasing of elastic interactions. The dynamic scaling regime of late-stage coarsening of the precipitates is attained. Thus the scaling behaviour of structure function is also applicable for elastic interaction systems. It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates.
Received: 08 April 2006
Revised: 20 September 2006
Accepted manuscript online:
PACS:
64.75.-g
(Phase equilibria)
Fund: Project supported by the
National Natural Science Foundation of China (Grant No~50071046) and
the National High Technology and Development Program of China (Grant
No~2002AA331050), and the Doctorate Foundation of Northwestern
Polytechnical University of China (Grant No~CX200507).
Cite this article:
Li Yong-Sheng(李永胜), Chen Zheng(陈铮), Lu Yan-Li(卢艳丽), and Xu Guo-Dong(徐国栋) Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys 2007 Chinese Physics 16 854
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