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A new approach to the analysis of short-range order in alloys using total scattering

DOI: 10.1016/j.actamat.2016.05.031 DOI Help

Authors: L. R. Owen (University of Cambridge) , Helen Playford (ISIS Facility, Rutherford Appleton Laboratory) , H. J. Stone (University of Cambridge) , M. G. Tucker (ISIS Facility; Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 115 , PAGES 155 - 166

State: Published (Approved)
Published: August 2016
Diamond Proposal Number(s): 10354 , 11665

Abstract: In spite of its influence on a number of physical properties, short-range order in crystalline alloys has received little recent attention, largely due to the complexity of the experimental methods involved. In this work, a novel approach that could be used for the analysis of ordering transitions and short-range order in crystalline alloys using total scattering and reverse Monte Carlo (RMC) refinements is presented. Calculated pair distribution functions representative of different types of short-range order are used to illustrate the level of information contained within these experimentally accessible functions and the insight into ordering which may be obtained using this new method. Key considerations in the acquisition of data of sufficient quality for successful analysis are also discussed. It is shown that the atomistic models obtained from RMC refinements may be analysed to identify directly the Clapp configurations that are present. It is further shown how these configurations can be enhanced compared with a random structure, and how their degradation pathways and the distribution of Warren-Cowley parameters, can then be used to obtain a detailed, quantitative structural description of the short-range order occurring in crystalline alloys.

Journal Keywords: Atomic ordering; Diffraction; Pair correlation function; Short-range order; Short-range ordering

Subject Areas: Materials, Physics

Instruments: I15-Extreme Conditions

Added On: 19/01/2017 13:31

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