Comparison of the strengths and microstructures of Cu-20% Ta and Cu-20% Nb in situ composites

✍ Scribed by W.A. Spitzig; P.D. Krotz

• Publisher: Elsevier Science
• Year: 1988
• Weight: 956 KB
• Volume: 36
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(88)90238-6

✦ Synopsis

Comparison of the strengths of wire drawn Cu-20% Ta and Cu-20% Nb in situ composites showed that Ta tilaments were more effective obstacles than Nb filaments to plastic deformation. Strengthening in both Cu-Ta and Cu-Nb composites correlated with Ta and Nb filament spacing, respectively, according to a Hall-Petch relationship with the Hall-Petch slope being about 20% greater in the Cu-Ta composites. Analysis of strengthening in these. composites showed that the degree of strengthening was most atTected by increasing draw ratio, followed by decreasing initial dendrite size in the Cu-Ta and Cu-Nb arc melted castings and increasing eiastic modulus of the composite.

R&mm&-La comparaison des resistances mecaniques de composites in situ Cu-20% Ta et Cu-20% Nb tr&l&s montre que Ies tilaments de Ta sont des obstacles a la deformation plastique plus efficaces que les filaments de Nb. Le durcissement dans les deux composites Cu-