Author: Nicholas J. Grant

Publisher:

Published: 1973

Total Pages: 44

ISBN-13:

A group of 42 copper base alloys containing 5 dispersoids (A12O3, SiO2, CoAl, Fe, and Mo) in amounts of 3, 7, and 11 percent, with particle sizes ranging from 0.01 to 25 microns (3 sizes in each alloy series), were prepared by powder blending. After extrusion at a reduction ratio of 6 to 1 at 745C, the alloys were tested for hardness, yield and tensile strength, ductility, and in stress rupture at 650C. In addition to the as-extruded condition, tests were also run on material annealed 10 hours at 650C. On average, all materials responded to the particle size and volume fraction of the dispersoid in the same direction, however, important differences in the extent and rate of the response were observed for both as-extruded and annealed materials, and in terms of metallic, intermetallic, or oxidic dispersions. The oxide dispersed alloys tend to behave as a cold worked copper matrix stabilized by a finely dispersed stable phase which does not interact directly with the matrix. The metallic dispersed alloys tend to behave as real alloys responding both to cold work and the effects of interactions between matrix and dispersoid. In this respect the 'insoluble' Mo dispersoid produces a stronger, more stable alloy than does the 'soluble' Fe dispersoid. (Author).