Transactions of Materials and Heat Treatment

Title：Influences of aging temperature on microscopic organization and mechanical properties of aluminum alloy 7075 for FSW component

Authors： Li Junchu Qin Wen Liu Dahai Xie Jilin

Unit： Nanchang Hangkong University

KeyWords： aging temperature aluminum alloy 7075 FSW mechanical properties conductivity

ClassificationCode：

year,vol(issue):pagenumber：2016,41(7):91-96

Abstract：

The aluminum alloy 7075 FSW T-beam was aged by the same time and different temperatures, and the aging process was analyzed. The experiments were carried out by dividing six groups according to the aging temperature from 140 ℃ to 240 ℃ with interval 20 ℃ and the aging time 4 h. The influence regulations of aging temperature on conductivity, tensile strength and elongation were given respectively, and the cause of mechanical properties change was explained by analyzing the metallographic microscopes of the welding line and SEM images of fracture morphology. The results show that conductivity increases with the increase of aging temperature at room temperature, and the tensile strength of workpiece changes little below 160 ℃. Then, the tensile strength decreases significantly with the increase of aging temperature, and reaches the peak of 331.8 MPa at 160 ℃. However, the elongation slightly fluctuates between aging processes from 140 ℃ to 180 ℃, and significantly increases above 200 ℃.

Funds：

国家自然科学基金资助项目(51375220)；江西省优势科技创新团队资助项目(CB201503100)

黎俊初(1957-),男,硕士，教授

Reference：

[1]王涛, 尹志民. 高强变形铝合金的研究现状和发展趋势[J]. 稀有金属, 2006,30(2):197-202.

Wang T, Ying Z M. Research status and development trend of ultra-high strength aluminum alloys [J]. Chinese Journal of Rare Metals, 2006,30(2):197-202.

[2]GB/T 2651-2008, 焊接接头拉伸试验方法[S].

GB/T 2651-2008, Method of tensile test for welded joint [S].

[3]GB/T 228-2002，金属材料室温拉伸试验方法[S].

GB/T 228-2002，Metallic materials-tensile testing at ambient temperature[S].

[4]Starink M J, Li X M. A model for the electrical conductivity of peak-aged and overaged Al-Zn-Mg-Cu alloys [J]. Metallurgical and Materials Transactions A, 2003, 34A (4): 899-911.

[5]张宇. 7075铝合金时效“双峰”应力腐蚀开裂与氢脆的研究[J]. 热加工工艺, 2013,42(6):178-181.

Zhang Y. Study on stress corrosion cracking and hydrogen embrittlement for double aging peaks in 7075 aluminum alloy[J]. Hot Working Technology, 2013,42(6):178-181.

[6]彭滔, 甘文英, 陈胜,等. 7075 铝合金搅拌摩擦加工组织的EBSD表征[J]. 电子显微学报, 2012,31(6):481-485.

Peng T, Gan W Y, Chen S, et al. EBSD analysis of microstructures of friction-stir-processed 7075 aluminum alloy[J]. Journal of Chinese Electron Microscopy Society, 2012,31(6):481-485.

[7]郭柱, 朱浩, 崔少朋,等. 7075 铝合金搅拌摩擦焊接头温度场及残余应力场的有限元模拟[J]. 焊接学报， 2015,36(2):92-96.

Guo Z, Zhu H, Cui S P, et al. Finite element simulation of friction stir welding temperature field and residual stress field of 7075 aluminum alloy[J]. Transactions of the China Welding Institution, 2015,36(2):92-96.

[8]钟崇文. 7075铝合金时效成形力学性能及微观组织特征研究[D]. 南昌：南昌航空大学，2015.

Zhong C W. Study on Mechanical Properties and Microstructure Characteristics of 7075 Aluminum Alloy after Age Forming[D]. Nanchang:Nanchang Hangkong University, 2015.

[9]Ferragut R, Somoza A, Tolley A. Microstructural evolution of 7012 alloy during the early stages of artificial aging [J]. Acta Materialia, 1999,17(47): 4355-4364.

[10]王希靖, 孙桂苹. 7075铝合金搅拌摩擦焊接头组织与性能[J]. 宇航材料工艺, 2008, (6): 77-80.

Wang X J, Sun G P. Microstructure and mechanical properties of welded joint of 7075 aluminum alloy by FSW [J]. Aerospace Materials & Technology, 2008, (6): 77-80.

Service：

【This site has not yet opened Download Service】【Add Favorite】