Safe Use of Magnesium Castings
The racing of historic cars is increasing in popularity in Australia and around the world. Many of these cars are aged well over 30 years and still racing at speeds up to 250 km/h with components made of magnesium and other metals for which the ageing process is little understood.
Magnesium is the lightest of the structural metals, weighing 75% less than steel and being around a third lighter than aluminium, so in racing car design it quickly replaced aluminium castings and some steel forgings with items such as cast magnesium wheels and various suspension components such as uprights and hubs.
Racing cars were usually designed for a relatively short life competition, so the designers of the day were not concerned about the longevity of highly stressed components. Today however, many restored and competing racing cars still incorporate the original castings that may have serious corrosion or stress problems.
While magnesium castings have excellent resistance to fatigue, due to their relative ductility, stress failures and corrosion are becoming a problem as historic cars mount up more and more mileage than their original designers envisaged.
To assist car owners and competitors in historic racing, AIMSS compiled an information guide ‘The Safe use of Magnesium Castings’ which provides information of how magnesium components in historic race cars are affected by age and stress and how they can monitor and manage any risks that may arise from the long term use of these castings.
(Click Button Below to Read the ‘Safe Use of Magnesium Castings’ Guide)