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Mechanical properties of a spray-cast aluminum alloy processed by severe plastic deformation

Xu, C., Kawasaki, M., Furukawa, M., Horita, Z. and Langdon, T.G (2007) Mechanical properties of a spray-cast aluminum alloy processed by severe plastic deformation Materials Science Forum, 539-543, pp. 141-148.

Record type: Article


Experiments were conducted to evaluate the mechanical properties of a spray-cast Al7034 alloy processed by severe plastic deformation. The alloy was received with an average grain size of ~2.1 ?m and processed by equal-channel angular pressing (ECAP) at a temperature of 473 K to give a grain size of ~0.3 ?m after 6 or 8 passes. Following ECAP, the mechanical properties were evaluated at room temperature (298 K) and at an elevated temperature of 673 K. In tensile testing at ambient temperature, the stress-strain curves show very short regions of strain hardening after ECAP and low values for the ultimate tensile strength by comparison with the unpressed alloy. This lack of strength is due to the high pressures imposed by ECAP and the consequent fragmentation and dissolution of the rod-like MgZn2 precipitates. It is shown that the strength may be restored by performing an appropriate ageing treatment after ECAP. Superplastic ductilities were recorded at a temperature of 673 K with tensile elongations exceeding 1000%. Careful inspection of the polished surfaces of samples pulled to fracture in the superplastic condition revealed the occurrence of extensive internal cavitation.

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Published date: 2007
Keywords: aluminium alloy, cavitation, equal channel angular pressing (ECAP), precipitation, superplasticity
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 50103
ISSN: 1662-9752
PURE UUID: 55e880b3-d0e3-4e75-8d0a-df9547cdaf47
ORCID for T.G Langdon: ORCID iD

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Date deposited: 24 Jan 2008
Last modified: 17 Jul 2017 14:53

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Author: C. Xu
Author: M. Kawasaki
Author: M. Furukawa
Author: Z. Horita
Author: T.G Langdon ORCID iD

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