Patent ID: 6342111
Filing Date: 2002-01-29
Classification: C22C

Abstract:
An energy-absorbing member of extruded aluminum alloy consisting of:Mg: 0.5-1.6 wt %; Zn: 4.0-7.0 wt %; Ti: 0.005-0.3 wt %; Cu: 0.05-0.6 wt %; at least one of Mn: 0.2-0.7 wt %, Cr: 0.03-0.3 wt %, and Zr: 0.05-0.25 wt %; and the remainder being Al and inevitable impurities, â€ƒwherein the energy-absorbing member has fiber structure and has undergone overaging treatment; the energy-absorbing member has a yield strength greater than 0.7 times the maximum yield strength (&sgr; 0.2 max) that is obtained by aging treatment; and the energy-absorbing member has a yield strength smaller than 0.92 times the maximum yield strength (&sgr; 0.2 max) that is obtained by aging treatment.