INFLUENCE OF COMPOSITION AND DISPERSOID ON FATIGUE FRACTURE BEHAVIOUR OF Al-Mg-Si ALLOYS
合金成分及弥散相对Al—Mg—Si合金疲劳断口形貌的影响

A study was made on the fatigue fracture behaviour under different aging cond-itions of two Al-Mg-Si alloys with different chemical composition and dispersoid contents.The dispersoid phase can alter the mode of fatigue fracture by the influence on the deformationuniformity of alloy. The dispersoid itself may decohere from the dispersoid/matrix interface undercyclic fatigue stress to form small-sized dimples.