Abstract
Internal stress in steady-state creep of long-range-ordered β'-brass was measured by strain transient dip test technique. Contrary to most of metallic materials, the internal stress of the alloy does not depend on the applied stress at a given temperature. Its value drastically decreases when temperature increases to the transition temperature to disordered state. The level of the internal stress is dominantly influenced by processes which disorder and order structure during slip of superdislocations. The level is probably also influenced by diffusion processes.

Key words
long-range-ordered alloys, creep, creep mechanisms, internal stress

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