Abstract
For beryllium bronze there is no reliably established data on structural transformations and their correlation with changes in properties occurring in the initial stages of aging (decomposition). A study of these stages is important since on their development depends the process of later decomposition stages, as a result of which the most important properties of the bronze are formed. This paper reports on a study of the initial stages of decomposition with low-temperature aging (150-240/sup 0/C) on beryllium bronzes quenched from 770/sup 0/C. It is concluded that: on adding up to 0.4% Mg to beryllium bronze type Br BNT1.9, development of the advance precipitation or zone stage is accelerated during aging in the temperature range 150-240/sup 0/C, and this is revealed in a reduction in activation energy for the process of supersaturated solid solution decomposition; and, the structural state recorded in beryllium bronzes after low-temperature aging, corresponding to the initial stages of solid solution decomposition, is similar to that obtained in phases of decomposition with short-term, high-temperature aging.
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