Title: Particle agglomeration and fracture in MA 956 and MMC friction joints

Authors: Y. Zhai, C. Maldonado, T.H. North, G.B. Bendzsak

Addresses: Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Ontario, Canada. ' Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Ontario, Canada. ' Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Ontario, Canada. ' Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Ontario, Canada

Abstract: Changes in the particle characteristics produced during friction joining of iron-based MA 956 and aluminium alloy 6061/Al₂O₃ (W6A.lOA-T6) material are investigated. Large irregularly-shaped particles are formed at the bondline in MA 956/MA 956 joints while particle fragmentation is observed in MMC/MMC joints. It is suggested that fluid flow promotes the retention of agglomerated (Y₂O₃, Al₂O₃, Ti(CN)) particles and fractured Al₂O₃ particles at the bondline regions in MA 956/MA 956 and MMC/MMC joints. There was excellent correspondence between numerically calculated fluid flow patterns in Al/Al friction joints and the movement of reinforcing Al₂O₃ particles in actual friction welded joints. In particular, Al₂O₃ particles were transferred from the location near the joint periphery towards the component centreline when MMC wires were inserted in an alloy 6061-T6 substrate prior to 6061/6061 friction joining.

Keywords: fracture mechanics; friction joints; MA956; MMC joints; particle agglomeration; friction welding; friction joining; aluminium alloys; fluid flow.

DOI: 10.1504/IJMPT.1998.036230

International Journal of Materials and Product Technology, 1998 Vol.13 No.1/2, pp.89 - 104

Published online: 01 Nov 2010 *

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