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

作　　者：王宇[1,2] 邓运来[1,2] 康建可[1,2] 张劲[1,2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学轻合金研究院高性能复杂制造重点实验室,长沙410012

出　　处：《航空材料学报》2014年第3期81-85,共5页Journal of Aeronautical Materials

基　　金：国家重点基础研究发展计划资助项目(2010CB731700);(2012CB619501);国家自然科学基金(No.51375503)

摘　　要：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%

关 键 词：振动蠕变时效成形 回弹 微观组织 7055铝合金 

分 类 号：TG166.3[金属学及工艺—热处理]