The Influence of Grain Size on Low-Stability Pre-Transitional Structural-Phase States of NiAl Intermetallide


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Abstract

Using the Monte Carlo method, the influence of grain size (model cell dimensions) on the peculiarities of pretransitional, low-stability structural-phase states of NiAl intermetallide in the region of structural-phase transformations is investigated during thermal cycling (heating and cooling). An analysis of the temperature dependences of the long-range order parameters shows that during heating the maximal long-range order is observed in an alloy with the maximal grain size, while the minimal – in the alloy with the smallest grain size. In order to achieve disordering of the alloy by increasing its grain size, it has to be increasingly overheated. Under cooling, long-range order primarily appears in a fine-grained alloy. The larger the grain size, the wider the temperature interval of the structural-phase transformation. The peculiarities of formation of the structural-phase states in the course of cooling as a function of the grain size (model cell dimensions) indicate that the first ordered regions appear in the fine-grained alloy. As the grain size increases, the temperature at which long-range order appears becomes lower, in other words, a still higher overcooling is required for the system's atomically-ordered states to be formed.

About the authors

A. I. Potekaev

National Research Tomsk State University; V. D. Kuznetsov Physical-Technical Institute at Tomsk State University

Author for correspondence.
Email: kanc@spti.tsu.ru
Russian Federation, Tomsk; Tomsk

A. A. Chaplygina

Polzunov State Technical University

Email: kanc@spti.tsu.ru
Russian Federation, Barnaul

P. A. Chaplygin

Polzunov State Technical University

Email: kanc@spti.tsu.ru
Russian Federation, Barnaul

M. D. Starostenkov

Polzunov State Technical University

Email: kanc@spti.tsu.ru
Russian Federation, Barnaul

V. V. Kulagina

V. D. Kuznetsov Physical-Technical Institute at Tomsk State University; Siberin State Medical University

Email: kanc@spti.tsu.ru
Russian Federation, Tomsk; Tomsk

A. A. Klopotov

V. D. Kuznetsov Physical-Technical Institute at Tomsk State University; Tomsk State Architecture and Building University

Email: kanc@spti.tsu.ru
Russian Federation, Tomsk; Tomsk

L. S. Grinkevich

National Research Tomsk State University

Email: kanc@spti.tsu.ru
Russian Federation, Tomsk

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