Aluminum bats have been around since the 1970s. They have become more popular than traditional wood bats because they are lighter in weight and less prone to damage. Over time, manufacturers incorporated different alloys in bats to create stronger, thinner walls of aluminum that are also lightweight. The thinner walls result in what is known as the "trampoline effect," where the aluminum springs in and out slightly as it makes contact with the ball. Today, aluminum bats are available in a variety of different types to suit individual batter style.
Aluminum with Different Alloys
Manufacturers use a variety of metal alloys to create aluminum baseball bats. The weight and strength of the bat are determined by the different combinations of copper, zinc and magnesium added to the aluminum. According to aluminumbats.com, some examples include the 7046 standard aluminum alloy; the CU31/7050, which is more durable because of higher levels of magnesium, zirconium and copper; the C405/7055 with more zirconium to make it stronger; and the C555 with traces of scandium to add strength.
Single- or Double-Layer Construction
Aluminum bats are available with either a single layer of aluminum or a double layer. Single-layer bats are lighter, less expensive and have a larger sweet spot to make contact with the ball. Advanced players usually prefer double-layer bats for the increased power and durability.
Graphite/Titanium-Lined
Aluminum bats lined with graphite or titanium are lightweight, strong and durable. The lined bats also have less vibration and ball sting after striking baseballs.
Cryogenically Treated
Cryogenically treated aluminum bats are also available. The bats are slowly cooled to -300 degrees Fahrenheit with nitrogen gas, and they remain at that temperature for at least eight hours. Next, they are gradually warmed to room temperature and heat-treated. This one-time process results in an increased life expectancy by strengthening the metal and reducing the tendency for the bat to dent.
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