Alloy development
Lithium is the least dense elemental metal. When combined with aluminum to produce Al-Li alloys every 1% increase in lithium to the mix results in a 3% reduction in the density and therefore the weight of the resulting alloy the modulus also increases by approximately 5%. In addition to reduced weight Al-Li alloys also have increased stiffness, high elastic modulus, fatigue and cryogenic durability(the 3rd generation of Space Shuttle external fuel tanks are made of Al-Li alloy), however the increased stiffness of Al-Li alloys means reduced ductility and fracture resistance in the short transverse direction. Al-Li alloys have a high resistance to fatigue crack growth because of the jagged path cracks must follow through the alloy.For more info to click here: http://www.secat.net
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