Development of Aluminum Alloy Extrusion （发展铝合金挤压）.pdf

Automotive bumper beams are made of either strength steel or extruded aluminum alloy. The high- following describes the aluminum alloy developed for automotive bumpers. Kobe Steel has developed a new 7000 series aluminum alloy for automotive bumpers. The alloy is featured by its high proof stress of about 350 MPa and a deformation resistance Aluminum extrusions, in addition to their lightness, comparable to that of 7003 alloy which has have an advantage of being formable into complex conventionally been used. The properties are achieved cross-sectional shapes with various wall thickness by adjusting the Mg and Zn content. distributions, shapes which are difficult to be formed In general, extruding aluminum alloy becomes by steel. Because of this advantage, many automobiles more difficult as its strength increases. The 7003 alloy 1) use aluminum extrusions of 6000 series (Al-Mg-Si) is easier to extrude compared to other 7000 series and 7000 series (Al-Mg-Zn) alloys for their bumper alloys, such as 7N01, which are extruded for higher beams1). Recent automotive bumpers employ strength products. However, the wall thicknesses structures having several components. A bumper of the extrusions made of 7000 series alloy tend to system may have components such as a bumper be thicker due to th