FORMABILITY OF TWIN ROLL CAST AA 5XXX ALLOY SHEET FOR AUTOMOTIVE APPLICATIONS

摘要

Properties required of aluminum sheet for automotive applications are high strength, good formability, weldability and corrosion resistance and are met largely by a number of AA5XXX alloys. Twin-roll casting has recently been used to produce low-cost/high-quality AA5XXX aluminum sheet for such applications. Initial results are encouraging and the strip-cast AA5052 and AA5182 alloys are shown to have equivalent or superior mechanical properties and better corrosion resistance with respect to their DC-Cast and Hot Rolled counterparts. While the use of aluminum sheet in automotive structural applications is increasing, better formability to overcome the problems encountered in sheet forming operations has become a critical issue. An attempt was made, in the present work, to characterize the formability of the twin-roll cast AA5XXX alloy sheets further by employing forming limit diagrams and other standard formability assessment tests.