Transactions of Materials and Heat Treatment

Title：Influences of solution treatment in an electric field on creep age forming of 2A12 aluminum alloy sheets

Authors： Li Junchu Li Minghua Liu Dahai

Unit： Nanchang Hangkong University

KeyWords： aluminum alloy electric solution treatment creep age forming springback

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2015,40(6):102-107

Abstract：

A new method for the creep age forming of aluminum alloy was provided based on solution treatment in an electric field to make billet. In order to evaluate the feasibility of this technology, the influence of different electric fields intensity on creep age forming of aluminum 2A12 was studied. The distinctions between creep age forming under different electric fields intensity and general creep age forming after solution treatment were explored and the mechanical properties and the microstructure of aluminum alloy 2A12 after treating were tested and analyzed. The results show that the creep age forming with solution treatment in an electric field has a certain impact on the microstructure and properties of aluminum alloy 2A12, and has better formability and elongation rate than age forming with general solution treatment. With the electric fields intensity increasing, the springback reduces gradually, the number of dimple is increased and size is enlarged. When solution treatment applied an electric intensity of 5.2 kV·cm-1，it will promote the dissolution of the second phase and lead to the increase of the proportion of CuAl2 precipitation.

Funds：

国家自然科学基金资助项目（51375220）

黎俊初（1957-）男，硕士，教授；通讯作者：李明华(1986-) 男，硕士研究生

Reference：

［1］孙志强.铝合金时效成形微观组织和性能及疲劳断裂特征[D].大连：大连理工大学，2009.Sun Z Q. Microstructure,Properties and Fatigue Fracture Characteristics of Aluminum Alloy after Age Forming [D].Dalian: Dalian University of Technology,2009.
［2］王秋成.航空铝合金残余应力消除及评估技术研究[D].杭州：浙江大学，2003.Wang Q C. Evaluation and Relief of Residual Stress in Aluminum Alloys for Aircraft Structures [D].Hangzhou: Zhejiang University,2003.
［3］Holman M C. Autoclave age forming large aluminum aircraft panels [J].Journal of Mechanical Working Technology,1989,20: 477-488.
［4］Cao W D,Lu X P,Sprcher A F,et al. Superplastic deformation behavior of 7475 aluminum alloy in an electric field[J]. Mater. Sci. Eng.,1990,A129(2):157-166.
［5］Conrad H,Cao W D,Lu X P,et al. Effect of electric field on cavitation in superplastic aluminum alloy 7475 [J]. Mater. Sci. Eng.,1991,A138(2): 247-258.
［6］Li S C,Conrad Hans. Electric filed strengthening during super plastic creep of Zn-5wt% Al: Negative electroplastic effect [J]. Scripta Mater.1998,39(7): 847-851.
［7］Lu X P,Cao W D,Sprecher A F,et al. Influence of an external electric field on the microstructure of superplastically deformed 7475 Al[J]. Mater. Sci. 1992,27(8): 2243-2250.
［8］Li M Q,Wu S C. Effect of external electric field on the cavitation during the superplastic deformation of duralumin LY12CZ [J]. Scripta Metall., 1994,31(1): 75-79.
［9］刘兵.静电场对铝合金的作用效应与机制[D].西安：西北工业大学，2002.Liu B. The Effect and the Mechanism of Static Electric Field on Aluminum Alloy [D].Xi′an: Northwestern Polytechnical University,2002.
［10］刘伟.铝锂合金电场热处理工艺及理论研究[D].沈阳：东北大学，1955.Liu W. Research of Electric Treatment Process and Theoretical on Al-Li Alloys[D]. Shenyang: Northeastern University，1955.
［11］蒙多尔福 L F.铝合金的组织与性能[M].王祝堂，译. 北京：冶金工业出版社,1988.Mondolfo L F. Microstructure and Properties of Aluminum Alloy [M]. Translated by: Wang Z T. Beijing: Metallurgical Industry Press，1988.
［12］魏齐龙,陈铮，刘兵.电场固溶对铝锂合金性能和断裂特征的影响[J].兵器材料科学与工程,2002,25（5）:14-17.Wei Q L,Chen Z,Liu B. Effect of solution treatment with electric field on properties and fracture characters of Al-Li alloys [J]. Ordnance Material Science and Engineering,2002,25(5):14-17.
［13］王磊.材料的力学性能[M].沈阳：东北大学出版社,2005.Wang L. Mechanical Properties of Materials [M]. Shenyang: Northeastern University Press,2005.
［14 ］Beachem C D,Pelloux R M N. Electron fractography-A tool for the study of micromechanisms of fracturing processes [J]. Fracturing Toughness Testing and Its Applications,ASTM STP,1965,381-210.
［15］孙军,邓增杰.钢中冶金因素与裂纹的失稳扩展[A].第五届全国断裂学术会议论文集[C].桂林,1985.Sun J,Deng Z J. The relationship between metallurgical factors in steel and characteristics of crack propagation resistance[A].Proceedings of the Fifth National Conference on Fracture[C]. Guilin,1985.
［16］Broek D. The role of inclusions in ductile fracture and fracture toughness[J].Engineering Fracture Mechanics,1973,5(1):55-66.
［17］戈康达.金属的疲劳与断裂[M]. 上海：上海科学技术出版社，1983.Ge K D. Fatigue and Fracture of Metals[M]. Shanghai: Shanghai Science and Technology Press,1983.
［18］上海交通大学《金属断口分析》编写组.金属断口分析[M].北京:国防工业出版社，1979.“Fracture Analysis of Metals”Writing Group of Shanghai Jiao Tong University. Fracture Analysis of Metals [M]. Beijing: National Defence Industry Press,1979.
［19］Ogura T，Hirosawa S，Sato T. Quantitative characterization of precipitate free zones in Al-Zn-Mg（-Ag）alloys by microchemical analysis and nanoindentation measurement [J].Science and Technology of Advanced Materials,2004,5(4): 491-496.

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