振动对7055铝合金蠕变时效成形的影响

Effects of Vibration on Creep Aging Forming of 7055 Aluminum Alloy

采用自制单曲率蠕变成形模具和振动试验平台,在淬火态7055铝合金板材蠕变时效成形过程中引入振动作用。研究了成形曲率、温度与振动方式对试样回弹量、力学性能和微观组织的影响。结果表明:在一定时间范围内,振动蠕变成形加速应力松弛,降低回弹量;促进铝合金的强化相析出且分布更加弥散;提高强度。在本文的试验条件下(120℃/24h),引入振动使峰值时效试样的强度提高7%,回弹量降低12.3%。

The Vibratory field was applied to the process of creep aging forming of water-quenched 7055 aluminum alloy sheets, which were operated on the self-made single curvature die and vibratory platform. The effects of temperature and vibration mode on the spring- back value,mechanical properties and mierostructures were investigated. The results show that within a certain range of time, the spri- ngback value is reduced and the rate of stress relief is accelerated. Meanwhile, the precipitation is promoted and the distribution of pre- cipitates is more dispersion, as a consequence, the strength of the alloy is improved on a considerable extent. On the experimental con- ditions of this paper, the strength of the VCAF specimens is increased with 7% , and the springback value is decreased with 12.3%