第二级时效工艺对7050铝合金厚板组织及性能的影响
Effect of Second Step Aging on Microstructure and Properties of 7050 Aluminum Alloy Thick Plate
摘 要
研究了第二级时效工艺对7050铝合金厚板拉伸性能、断裂韧度及电导率的影响, 并采用透射电镜及扫描电镜分析其强韧化机理。结果表明: 该合金厚板在双级时效的第一级时效条件相同时, 随第二级时效温度的升高或时效时间的延长, 合金中沉淀相的尺寸和间距增大, 合金强度下降, 断裂韧度和抗应力腐蚀能力提高, 切变和穿晶韧窝混合型断裂方式中的韧窝特征愈加突出, 且时效温度对性能的影响较时间明显; 在120 ℃×4 h+165 ℃×28 h双级时效工艺下合金具有优异的综合性能。
双级时效
显微组织
性能
沉淀相
7050 aluminum alloy thick plate
two-step aging
microstructure
property
precipitate
Abstract
The influence of the second step aging treatment on tensile properties, fracture toughness and electrical conductivity of 7050 aluminum alloy thick plates was investigated. Meanwhile, the strengthening-toughening mechanism was analyzed by transmission electron microscopy and scanning electron microscopy. The results show that the sizes and distance of precipitates phases increased and the strength of the alloy decreased, the fracture toughness and the stress corrosion resistance increased, the dimple character in shearing and transgranular dimple mixed fracture was more outstanding, and the effect of aging temperature on the alloy properties was more obvious than aging time with the second aging temperature or time increasing when the first step aging conditions was same. The alloy had good comprehensive properties after aging at 120 ℃ for 4 h and 165 ℃ for 28 h.
中图分类号 TG146.2 TG156.92
所属栏目
基金项目
收稿日期 2010/6/22
修改稿日期 2011/3/15
网络出版日期
作者单位点击查看
备注冯朝辉(1972-), 男, 安徽砀山人, 高级工程师, 硕士。
引用该论文: FENG Zhao-hui,WANG Shao-hua,HU Xing-hua,GONG Peng,YANG Shou-jie,LU Zheng,RU Ji-gang,ZHANG Xing-guo,DAI Sheng-long. Effect of Second Step Aging on Microstructure and Properties of 7050 Aluminum Alloy Thick Plate[J]. Materials for mechancial engineering, 2011, 35(5): 35～38
冯朝辉,王少华,胡兴华,龚澎,杨守杰,陆政,汝继刚,张兴国,戴圣龙. 第二级时效工艺对7050铝合金厚板组织及性能的影响[J]. 机械工程材料, 2011, 35(5): 35～38
被引情况:
【1】高莹,张显峰,王少华,刘惠, "新型铝锌镁铜系高强韧铝合金型材的双级时效工艺",机械工程材料 40, 61-65(2016)
【2】王少华,马志锋,刘惠,张显峰,孙刚,冯朝辉,李伟,陆政, "铝锌镁铜锆钪合金型材的组织和性能",机械工程材料 38, 60-65(2014)
【3】李 慧,陈 涛,赵路远,黄 俊,吴玉程, "T651态7075铝合金的显微组织与拉伸断裂机制",机械工程材料 40, 38-43(2016)
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参考文献
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【3】李 海, 王芝秀, 郑子樵.7050 铝合金高温预析出处理[J].稀有金属材料与工程, 2008, 37(4):674-677.
【4】DIXIT M, MISHRA R S, SANKARAN K K. Structure property correlations in Al 7050 and Al 7055 high-strength aluminum alloys[J].Materials Science and Engineering A, 2008, 478:163-172.
【5】王少华, 杨守杰, 房灿峰, 等.电磁铸造对Al-Zn-Mg-Cu-Zr合金微观组织及晶内固溶度的影响[J].中国有色金属学报, 2009, 19(12):2083-2089.
【6】LI Z H, XIONG B Q, ZHANG Y A, et al. Effects of the two-step ageing treatment on the microstructure and properties of 7B04 alloy pre-stretched thick plates[J].Rare Met, 2007, 26(3):193-199.
【7】LI Z H, XIONG B Q, ZHANG Y A, et al. Investigation of microstructural evolution and mechanical properties during two-step ageing treatment at 115 and 160 ℃ in an Al-Zn-Mg-Cu alloy pre-stretched thick plate[J].Mater Charact, 2008, 59:278-282.
【8】王少华.高强铝合金电磁铸造及强韧化研究[D].大连: 大连理工大学, 2009.
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【10】SHERCLIFF H R, ASHBY M F. A process model for age hardening of aluminium alloys-I. The model[J].Acta Metall Mater, 1990, 38(10):1789-1802.
【11】SONG M. Modeling the hardness and yield strength evolutions of aluminum alloy with rod/needle-shaped precipitates[J].Materials Science and Engineering A, 2007, 443:172-177.
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