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A forged magnesium wheel is 25 percent lighter than cast wheel. The main disadvantage of forged wheels is the high manufacturing cost. Owing to the typically high costs of finished wheels, forged wheels are still rarely purchased by non-professional drivers for regular road use.
Alloy wheels have long been included as standard equipment on higher-priced luxury or sports cars, with larger-sized or "exclusive" alloy wheels being options. The high cost of alloy wheels makes them attractive to thieves; to counter this, automakers and dealers often use locking lug nuts or bolts which require a special key to remove.
One engineering text says, "alloy wheels [are] often incorrectly called aluminum rims". [ 18 ] Some authors are careful to use rim literally for only the outer portion of a wheel, where the tire mounts, [ 19 ] just as the rim of a coffee cup or a meteor crater does not refer to the entire object.
Marking AZ91A for example conveys magnesium alloy with roughly 9 weight percent aluminium (between 8.6 and 9.4) and 1 weight percent zinc (between 0.6 and 1.4), and the final A means it was the first alloy with this composition at the time of registration. Exact composition should be confirmed from reference standards.
A 1977 Harley-Davidson XLCR with seven-spoke alloy wheels manufactured by Morris [8]. High-performance motorcycles began to use cast alloy wheels (usually aluminum but sometimes magnesium) as early as the Münch Mammoth, with its single cast-elektron [9] rear wheel which was shown at the Intermot motorcycle show at Cologne in late 1966. [10]
Ductile fracture of an AlMgSi alloy Brittle fracture of an aluminum alloy. Dispersion particles have little influence on strength. If magnesium or silicon excrete on them during cooling after the solution annealing and, thus, do not form magnesium silicide as desired, they even lower the strength. They increase the sensitivity to deterrent.