High-Temperature X-ray Diffraction Studies of Lattice Dynamics in Ni_{3}(Fe,Nb) Ordered Alloys

• Authors: A. Mekhrabov
• Languages of publication: EN

Abstracts

EN

A study is performed on characteristics of lattice dynamics in the initially ordered ternary Ni_{3}(Fe_{1-x}Nb_{x}) (x = O to 10 at.%) alloys using high temperature X-ray diffractometry for the temperature range from 300 K to 1300 K. Aspects investigated included temperature and concentration dependencies of the full mean square atomic displacements Ū²_{f}, the Debye characteristic temperature Θ_{D}, and linear thermal expansion coefficient α. It is found that the Ū²_{f}, Θ_{D}, and α parameters show anomalous change at temperatures where the alloys are subjected to order-disorder phase transitions. It is further found that Nb addition results in the considerable increase in the parameters Ū²_{f} and α and decrease in Θ_{D}. Moreover, the addition of Nb stabilizes Ni_{3}Fe ordered structure and shifts the order-disorder transition to higher temperature.

Keywords

EN

61.10.-i

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1994
• Volume: 85
• Issue: 3
• Pages: 571-578

Dates

published

1994-03

received

1993-08-03

(unknown)

1993-11-16

Contributors

author

A. Mekhrabov

• Department of Metallurgical Engineering, Middle East Technical University, 06531 Ankara, Turkey

Identifiers

DOI

10.12693/APhysPolA.85.571