外加应力对Al-Cu-Mg-Ag合金时效析出行为的影响-中国有色金属学报.PDF

20 8 2010 8 Vol.20 No.8 The Chinese Journal of Nonferrous Metals Aug. 2010 1004-0609(2010)08-1513-07 Al-Cu-Mg-Ag 1 1, 2 1 1 1 1 (1. 410083 2. 410083) Al-Cu-Mg-Ag Al-Cu-Mg-Ag Al-Cu-Mg-Ag θ′Ω ΩΩ Al-Cu-Mg-Ag TG146 Effects of external stress on aging precipitation behavior of Al-Cu-Mg-Ag alloy 1 1, 2 1 1 1 1 CAO Su-fang , PAN Qing-lin , LIU Xiao-yan , LU Zhi-lun , HE Yun-bin , LI Wen-bin (1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China) Abstract: Comparing the normal aging and stress aging, the effects of external stress on the aging precipitation behavior of Al-Cu-Mg-Ag alloy were studied by Wicker hardness test (HV), optical microscopy (OM), two-bridge electric-resistivity test and transmission electron microscopy (TEM). The results show that the external stress during aging decreases the aging process of Al-Cu-Mg-Ag alloy and the hardness of peak aging, and prolongs the time of underaging stage. The external stress can enhance the precipitation of θ′ phase and retard the precipitation and growth of Ω phase. With the effects of the external stress, the preferential oriented precipitation of Ω phase is observed, which