On the Mechanism of Dispersion Strengthening. (I). Stored Energy Measurement in Dispersion Strengthened Iron. (II).
On the Mechanism of Dispersion Strengthening. (I). Stored Energy Measurement in Dispersion Strengthened Iron. (II).

Author: Nicholas J. Grant

Publisher:

Published: 1973

Total Pages: 44

ISBN-13:

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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).

Sintering and Catalysis
Sintering and Catalysis

Author: G. Kuczynski

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 506

ISBN-13: 1468409344

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The proceedings of the 4th International Conference on Sin tering and Related Phenomena, contained in this volume, have been broadened in scope to include the phenomena of sintering and coa lescence of catalytic materials dispersed upon refractory oxides. For it has long been recognized within the circles of chemists and chemical engineers working in the field of catalysis that one of the chief causes of the decline in heterogeneous catalytic activity and/or selectivity is, indeed sintering, or perhaps using a better term, coalescence of the supported catalytic metal and compounds thereof. Essentially catalytic deactivation by sintering is now weIl recognized as Ostwald ripening; which of course is a phenome non familiar to scientists grappling with the problem of sintering of powder compacts. The 4th Conference at Notre Dame marks the first occasion at which scientists and engineers of each discipline were assembled in the same room to exchange views on these phenome na of mutual concern. In the wake of the Conference at Notre Dame, all parties acknowledged the synergistic benefit which issued from this exchange, both at the formal and informal level. All were persuaded that signal benefits will be realized by a continuation of this collab oration in the form of future sintering conferences in which both powder metallurgists and catalytic scientists and engineers would participate.