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EPL, 82 (2008) 40007
DOI: 10.1209/0295-5075/82/40007

Phase transition with non-deterministic nature in the Ni3Al0.45V0.50 alloy

M. Tanimura1, T. Doi2 and Y. Koyama2

1  Research Department, NISSAN ARC, LTD. - Yokosuka, Kanagawa 237-0061, Japan
2  Department of Photonic and Electronic Systems, Waseda University - Shinjuku, Tokyo 169-8555, Japan

tanimura@nissan-arc.co.jp

received 22 January 2008; accepted in final form 7 April 2008; published May 2008
published online 15 May 2008

Abstract
We demonstrate a thermodynamic state change dominated by a non-thermodynamic variable found in the Ni3Al0.45V0.50 alloy. Specifically, the L12 $\rightarrow$ L12 + D022 evolution, which is a sub-phenomenon of the fcc $\rightarrow$ L12 + D022 phase transition, takes place only when lattice defects are introduced to more than a certain critical density in the L12 diffusion field. Because the defect density changes along with the variation in the thermodynamic path, the path variation can alter the evolved state even under an identical thermodynamic condition. This path dependence of the state change shows the non-deterministic (chaotic) nature of the phase transition.

PACS
05.70.-a - Thermodynamics.
64.70.kd - Metals and alloys.
64.75.Op - Phase separation and segregation in alloying.

© EPLA 2008