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Showing papers by "Marc A. Meyers published in 1988"


Journal ArticleDOI
TL;DR: In this article, a cylindrical geometry with two co-axial tubes was used for shock consolidation of powders, which can generate pressures in the powder that can be several times higher than the ones generated by the single tube technique.

103 citations


Journal ArticleDOI
TL;DR: In this article, the effects of explosive type, explosive-to-powder mass ratio, powder container material and thickness, type of confinement, shielding material, and preheating temperature were investigated.
Abstract: Explosive consolidation of the rapidly-solidified nickel-base super-alloy powder IN 718 was successfully accomplished. The effects of explosive type, explosive-to-powder mass ratio, powder container material and thickness, type of confinement, shielding material, and preheating temperature were investigated. Conditions for satisfactory consolidation, with good mechanical properties and low microcrack density, were established. The best consolidation was achieved by using a double-tube design in which a flyer tube was explosively accelerated, impacting the (cylindrical) powder container. The powder was pre-heated at 525° C and the initial consolidation pressure was calculated to be 18 GPa, resulting in approximately 20% apparent interparticle melting (white-etching regions between particles). The quality of the consolidates was evaluated by optical and electron microscopy, and by tensile testing.[/p]

38 citations


Journal ArticleDOI
01 Sep 1988-JOM
TL;DR: In this article, explosively generated shock waves have been used to assist in the consolidation of aluminide powders, resulting in full densification, and reaction synthesis, making use of a solid I liquid reaction to form an alloy, has shown promise as a means of fabricating aluminides.
Abstract: Because of their unique properties, new materials must often be synthesized using unusual and innovative methods. For example, explosively generated shock waves have been used to assist in the consolidation of aluminide powders, resulting in full densification. Reaction synthesis, making use of a solid I liquid reaction to form an alloy, has also shown promise as a means of fabricating aluminides. Using reaction synthesis to form ternary intermetallic compounds may result in more favorable crystal structures and better ductility, but more investigation is necessary.

6 citations


Journal ArticleDOI
TL;DR: In this article, the cinetique de transformation martensitique induite par une impulsion de contrainte produite by the reflexion d'une onde de choc compressive sur une surface libre dans les alliages Fe-32% Ni-0,035% C and Fe-22,5% Ni -4% Mn (% en poids).
Abstract: Etude de la cinetique de transformation martensitique induite par une impulsion de contrainte produite par la reflexion d'une onde de choc compressive sur une surface libre dans les alliages Fe-32% Ni-0,035% C et Fe-22,5% Ni-4% Mn (% en poids). Influence de la variation de temperature ou de la duree de l'impulsion a pression constante. Determination des parametres cinetiques et energetiques de la transformation martensitique

6 citations


Journal ArticleDOI
TL;DR: On a conduit les essais dans un canon a gaz, les disques d'alumine etant confines dans des capsules de cuivre and d'Aluminium, afin de produire des contraintes de compression and de compression plus traction dans l'alume.
Abstract: On etudie les mecanismes et la cinetique de la fragmentation de l'alumine sous des conditions d'impact. On a conduit les essais dans un canon a gaz, les disques d'alumine etant confines dans des capsules de cuivre et d'aluminium, afin de produire des contraintes de compression et de compression plus traction dans l'alumine

5 citations