The triennial International Alloy Conferences (IACs) aim at the identification and promotion of the common elements developed in the study, either experimental, phenomenological, or theoretical and computational, of materials properties across materials types, from metals to minerals. To accomplish this goal, the IACs bring together scientists from a wide spectrum of materials science including experiment, theory, modeling, and computation, incorporating a broad range of materials properties. This volume of proceedings contains the papers presented at IAC-2, that took place in Davos, Switzerland, on August 8-13, 1999. The papers in the volume were assembled into the following categories: Microstructural Properties: Ordering, Kinetics and Diffusion; Magnetic Properties and Elastic Properties. The editors have juxtaposed apparently disparate approaches to similar physical processes, in the hope of revealing the dynamic character of the processes under consideration. The hope is to invigorate new kinds of discussion and reveal challenges and new avenues to the description and prediction of properties of materials in the solid state and the conditions that produce them.