CSIRO has developed a new heat treatment process for high pressure die casting (HPDC) of aluminium which is said to double the mechanical strength, and improve the fatigue resistance and energy absorption of treated parts.
According to the research organisation, components treated with the new process do not show surface blistering or dimensional changes, and retain an as-cast appearance.
The fatigue resistance of the treated aluminium HDPC components are said to be as high as for some wrought aluminium products, with limiting behaviour usually observed in steel.
Energy absorption of parts during fracture are said to have been substantially raised. Such components may have potential in load-carrying structural and safety applications.
It is also claimed the treatment improved the thermal conductivity of parts, allowing them to be used in cooling and lubrications systems with lower amounts of fluid.
According to the organisation, the process can be implemented in existing manufacturing facilities, and is more cost-effective than other manufacturing methods in mass production.
The heat treatment process can easily be implemented in existing manufacturing facilities using conventional heat treatment equipment such as continuous belt furnaces, fluidised beds or furnace systems designed specifically for rapid heat treatment.

Key contact:
Dr Roger Lumley
Roger.Lumley@csiro.au

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