Causes for black flecks on the surface of 5A02 Al-alloy flange forgings
LI Yan;ZHAO Ye-qing;SONG Guo-hua;ZHOU Hong;DU Xiu-hua;CHEN Xiu-fan;National Engineering Research Center for Plastic Working of Aluminum Alloys;Shandong Nanshan Aluminum Co.;Ltd.;Beijing Nanshan Institute of Aeronautical Materials;