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Short‐Range Order and Atomic Displacements in Ni–20 at% Cr Single Crystals
Author(s) -
Schönfeld B.,
Reinhard L.,
Kostorz G.,
Bührer W.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221480203
Subject(s) - intensity (physics) , range (aeronautics) , materials science , monte carlo method , inverse , atomic physics , short range order , atomic number , neutron , neutron scattering , scattering , molecular physics , condensed matter physics , chemistry , crystallography , physics , optics , geometry , mathematics , nuclear physics , statistics , composite material
Ni–20 at% Cr single crystals aged at 741, 828, and 973 K for up to 480 h are investigated by elastic diffuse neutron scattering. The contributions due to short‐range order and atomic size effect are separated by a least‐squares fitting procedure. The short‐range order with diffuse intensity maxima at l 1/2 0 positions increases with decreasing ageing temperature. In comparison, the intensity due to atomic displacements is weak. For the three ageing temperatures investigated the effective pair potentials, determined from the Clapp‐Moss high temperature approximation as well as with an inverse Monte‐Carlo method, are very similar.