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Development of mechanical properties during secondary aging in aluminium alloys

2005; Maney Publishing; Volume: 21; Issue: 9 Linguagem: Inglês

10.1179/174328405x51875

1743-2847

Roger Lumley, I. J. Polmear, A.J. Morton,

Aluminum Alloys Composites Properties

AbstractAbstractEarlier work has shown that, if the artificial aging of aluminium alloys is interrupted by a dwell period at lower temperature, higher values of tensile properties and fracture toughness may be achieved than are possible with single stage T6 tempers. A second interrupted aging cycle has now been developed that involves underaging at the elevated temperature, quenching, and then allowing secondary precipitation to occur at, or just above, room temperature. Designated a T6I4 (I=interrupted) temper by the authors, this simpler aging cycle may reduce heat treatment costs. Tests on some 30 cast and wrought alloys have resulted in tensile properties close to those for a T6 temper, with higher values of fracture toughness being recorded for some cases. Such an aging treatment can be incorporated into a paint bake cycle to simplify the heat treatment of coated automotive components.Keywords: ALUMINIUM ALLOYSHEAT TREATMENTSECONDARY AGING