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利用小角度X射线散射(SAXS)技术系统、定量地研究了AA 7055铝合金在120和160℃时效过程中析出相的演变规律。结果表明,在120℃时效时,随时效时间延长析出相半径不断增加,时效5 h后半径基本稳定,约为3.3 nm,且尺寸分布基本不变;析出相的体积分数随着时效时间的延长不断增加,由时效5 h时的2.4%增加到时效60 h时的5.2%。在160℃时效时,随时效时间延长析出相半径不断增加,由时效0.5 h时的3.1 nm增加到时效72 h时的11.7 nm,尺寸分布范围也随着时效时间的延长而逐渐增加;析出相的体积分数随着时效时间的延长先不断增加,由时效0.5 h时的1.4%增加到时效16 h时的5.4%,时效16 h后趋于平衡。在120和160℃时效时,析出相均属于轴比介于0.2~0.3之间的扁椭球状,即为盘状。
The evolution of precipitation phase of AA 7055 aluminum alloy during aging at 120 and 160 ℃ was studied quantitatively by using the small angle X-ray scattering (SAXS) system. The results show that the radius of the precipitated phase increases with aging time at 120 ℃, and the radius of the precipitated phase increases with the aging time at 5 ℃. The radius of the precipitated phase is about 3.3 nm and the size distribution is basically unchanged. The volume fraction of the precipitated phase increases with the aging time Increasing from 2.4% at 5 h of aging to 5.2% at 60 h of aging. With the aging time of 160 ℃, the radius of precipitates increases with the aging time from 3.1 nm at 0.5 h to 11.7 nm at 72 h, and the size distribution increases with the aging time. The precipitates Of the volume fraction increases with the aging time first increasing from 1.4% at 0.5 h aging to 5.4% at 16 h aging, and then tends to balance after 16 h aging. At 120 and 160 ℃ aging, the precipitation phase belong to the axial ratio of between 0.2 to 0.3 oblate ellipsoid, which is disc-shaped.