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Instruments / Technical Area	Publication Details	Published	Actions
E02-JEM ARM 300CF	Microstructural and mechanical characterisation of a second generation hybrid metal extrusion & bonding aluminium-steel butt joint Tina Bergh , Lise Sandnes , Duncan Neil Johnstone , Øystein Grong , Filippo Berto , Randi Holmestad , Paul Anthony Midgley , Per Erik Vullum Materials Characterization DOI: 10.1016/j.matchar.2020.110761 Diamond Proposal Number(s): [20527] Open Access Show Abstract ▼ Abstract: Hybrid metal extrusion & bonding (HYB) is a joining method that enables solid-state bonding by combining addition of aluminium filler material through continuous extrusion with pressure exerted by a rotating steel tool. This work presents mechanical and microstructural characterisation of a second generation HYB butt joint of aluminium alloy 6082 and structural steel S355. The ultimate tensile strength was measured to be in the range of 184–220 MPa, which corresponds to 60–72% joint efficiency. Digital image correlation analysis of the strain development during tensile testing revealed that root cracks formed, before the final fracture ran close to the aluminium-steel interface. A significant amount of residual aluminium was found on the steel fracture surface, especially in regions that experienced higher pressure during joining. Scanning and transmission electron microscopy revealed that the bond strength could be attributed to a combination of microscale mechanical interlocking and a discontinuous nanoscale interfacial Al-Fe-Si intermetallic phase layer. Analysis of scanning electron diffraction data acquired in a tilt series, indicated that the polycrystalline intermetallic phase layer contained the cubic αc phase. The results give insight into the bonding mechanisms of aluminium-steel joints and into the performance of HYB joints, which may be used to better understand and further develop aluminium-steel joining processes.	Nov 2020

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E02-JEM ARM 300CF

Microstructural and mechanical characterisation of a second generation hybrid metal extrusion & bonding aluminium-steel butt joint

Tina Bergh , Lise Sandnes , Duncan Neil Johnstone , Øystein Grong , Filippo Berto , Randi Holmestad , Paul Anthony Midgley , Per Erik Vullum

Materials Characterization

DOI: 10.1016/j.matchar.2020.110761

Diamond Proposal Number(s): [20527]