Investigation of superplastic behaviour and solid state bonding of Zircaloy-4

Conference item

Superplastic behaviour and isostatic diffusion bonding (DB) have been investigated for as-received annealed Zircaloy-4 sheet of relatively large grain size. The material was superplastic at strain rates up to 5.0 x 10(-4)s(-1) at temperatures in the lower part of the alpha+beta phase field for beta -phase volumes of 10-20%. At higher strain rates and lower temperatures the material deformed by power law creep. The DB studies showed that for intermediate and higher temperatures in the alpha+beta phase field, sound bonds could be obtained at relatively low pressures and short times. Bonding in the alpha -phase field required much higher pressures. Modifications to an earlier model of the DB process involved constraint of collapse by creep of inter-void ligaments at the bond interface. This lead to a dominance of stress directed boundary diffusion and gave improved agreement between prediction and observation for DB of the alpha- phase.

Authors: Hill, P; Ridley, N; Todd, R

• Publication status: Published
• Journal: SUPERPLASTICITY IN ADVANCED MATERIALS, ICSAM-2000
• Volume: 357-3
• Pages: 99-104
• Publication date: 2001-01-01
• Event title: International Conference on Superplasticity in Advanced Materials (ICSAM-2000)
• ISSN: 0255-5476
• ISBN: 0878498745
• Keywords: diffusion bonding; superplasticity; solid state bonding; Zircaloy 4; modelling