MULTI-SCALE STRUCTURAL DESIGN AND PROCESSING FOR INCREASED STRENGTH IN ALUMINIUM ALLOYS

摘要

Those structural parameters that may potentially be manipulated to maximize strength in aluminium alloys are identified and the scope for further meaningful improvements in strength is examined. Attention is directed to alloy composition, control of grain size and the control of dispersed second phase particles and strengthening constituents. In the case of heat-treatable alloys, recent work in wrought materials designed to rationalize the roles of precipitate identity, form, crystallography and distribution, and the factors that control the effectiveness of dispersed strengthening phases is reviewed. The potential for extending the strategies utilized for strengthening wrought alloys to existing and emerging cast alloy systems is examined critically. This analysis is accompanied by a review of existing and emerging approaches to materials processing that permit implementation and control of desired structural changes. Emphasis is given to new multi-stage heat treatments and to the potential for achieving efficiencies in thermal treatment utilising continuous processing routes.