This book contains 18 invited contributions to the first Inter- national
Symposium on Order-Disorder Transformations in Alloys+. They cover the
major aspects of this group of phase transformations. Although
structural order-disorder transformations have been investigated for
over 50 years the invited papers, the research papers - whose titles and
authors are listed in the appendix - and the discussions at the
Symposium have demonstrated very active continued interest and con-
siderable recent progress in the subject. This is true for theoretical
work as weIl as for experimental studies and for the development of
materials whose properties result from order-disorder transformations. +
Some major national conferences on ordering were held in the USA and in
the USSR in recent years; the proceedings are available in the following
pUblications: Local Atomic Arrangements Studied by X-Ray Diffraction,
Gordon & Breach, New York 1966 2 Ordered Alloys, Claitor's Publ. Div.,
Baton Rouge, La. 1970 3 Summaries of the Proceedings of the 2nd Union
Conference on Atomic Ordering and its Influence on the Properties of
Alloys, Naukova Dumka, Kiev 1966 4 Atomic Ordering and its Influence on
the Properties of Alloys, Naukova Dumka, Kiev 1968 5 Atomic Ordering and
its Influence on the Properties of Alloys, TGU, Tomsk 1973 111 In
assembling these papers it vas attempted to compile a systematic and
approximately complete compendium of the sUbject.