Effects of Solution Temperature on Microstructure of 2A66 Al-Cu-Li Alloy

Abstract:

The effect of solution temperature on the solid solubility, microstructure and mechanical properties of 2A66 Al-Cu-Li alloy was studied by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile test. The results show that with the solution temperature increasing from 480°C to 520°C,the amount of residual phases decreased and the solid solubility increased obviously, while the recrystallization hardly changed with the increasing of solution temperature. With the solution temperature increased to above 530°C, the amount of residual phases almost did not change. With the solution temperature increasing to above 540°C, the alloy was over-burnt obviously. Complete dissolution of the particles in the 2A66 Al-Cu-Li alloy was obtained after solution treatment at 520°C.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 687-692
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.687
• Online since: March 2016
• Authors: Yue Wu, Xu Dong Wang, Jiong Li Li, Zhao Hui Feng
• Keywords: Al₃Zr Precipitates, Al-Cu-Li Alloy, Microstructure, Solution

References

[1] LI Jin-feng, ZHENG Zi-qiao, REN Wen-da, CHEN Wen-jing, ZHAO, Xu-shan, LI Shi-chen. Simulation on function mechanism of T1(Al2CuLi) precipitate in localized corrosion of Al-Cu-Li alloys [J]. Transactions of Nonferrous Metals Society of China, 2006, 16(6): 1268-1273.

DOI: 10.1016/s1003-6326(07)60005-3

[2] RIOJA R J, LIU J. The evolution of Al-Li base products for aerospace and space applications [J]. Metallurgical Materials Transactions A, 2012, 43(9): 3325-3337.

DOI: 10.1007/s11661-012-1155-z

[3] HUANG Lan-pin, ZHENG Zi-qiao, CHEN Kang-hua, et al. Study on Microstructure and properties of 2197AI-Li alloy [J]. Powder Metallurgy Materials Science and Engineering, 2003, 8(4): 299−307.

[4] JABRA J, ROMIOS M, LAI J, et al. The effect of thermal exposure on the mechanical properties of 2099-T6 die forgings, 2099-T83 extrusions, 7075-T7651 plate, 7085-T7452 die forgings, 7085-T7651 plate, and 2397-T87 plate aluminum alloys [J]. Journal of Materials Engineering and Performance.

DOI: 10.1361/105994906x136142

[5] BUCHHEIT R G, MATHUR D, GOUMA P I. Grain boundary corrosion and stress corrosion cracking studies of Al-Li-Cu alloy AF/C458 [J]. Ohio State University, Columbus, OH, undated.

DOI: 10.1002/9781118787922.ch10

[6] YOSHIMURA R, KONNO T J, ABE E, HIRAGA K. Transmission electron microscopy study of the evolution of precipitates in aged Al-Li-Cu alloys: The θ' and T1 phases [J]. Acta Materialia, 2003, 51(14): 4251-4266.

DOI: 10.1016/s1359-6454(03)00253-2

[7] LI Hong-ying, TANG Yi, ZENG Zai-de, ZHENG Zi-qiao, ZHENG Feng. Effect of ageing time on strength and microstructures of an Al-Cu-Li-Zn-Mg-Mn-Zr alloy [J]. Materials Science and Engineering A, 2008, 498(1-2): 314-320.

DOI: 10.1016/j.msea.2008.08.001

[8] LI Hong-ying, TANG Yi, ZENG Zai-de, ZHENG Feng. Exfoliation corrosion of T6- and T8-aged AlxCuyLiz alloy [J]. Transactions of Nonferrous Metals Society of China, 2008, 18(4): 778-783.

DOI: 10.1016/s1003-6326(08)60134-x

[9] ZHU Xiao-hui, ZHENG Zi-qiao, ZHONG Shen. Effect of Mg and Zn on microstructure and tensile properties of 2099 alloy [J]. The Chinese Journal of Nonferrous Metals, 2010, 20(10): 1861-1867.

[10] WU Yue-mei, JI Xiong, LAI Ren-ming, ZHANG Xiang-yu, GUO Zhi-xing. The microstructure evolution of an Al-Mg-Si-Mn-Cu-Ce alloy during homogenization [J]. Journal of Alloys Compounds, 2009, 475(1−2): 332-338.

DOI: 10.1016/j.jallcom.2008.07.032

[11] LUMLEY R N, POLMEAR I J, MORTON A J. Interrupted aging and secondary precipitation in aluminum alloys[J]. Materials Science and Technology, 2003, 19(11): 1483−1490.

DOI: 10.1179/026708303225008112

[12] DUPASQUIER A, SOMOZA A, LUMLEY A J. Studies of secondary ageing in aluminum alloys[J]. Materials Forum, 2004, 28: 85−95.

[13] OLIVERA A F J, de BARROS M C, CARDOSO K R. The effect of RRA on the stress corrosion cracking and SCC resistance on AA7050 and AA7150 aluminum alloys[J]. Materials Science and Engineering A, 2004, 379: 321−326.

DOI: 10.1016/j.msea.2004.02.052

[14] WALLACE W, BEDDOES J C, DE MALHERBE M C. New approach to the problem of stress corrosion cracking in 7075-T6 aluminum[J]. Canadian Aeronautics and Space Journal, 1981, 27(3): 222−232.

[15] CHEN Kang-hua, LIU Hong-wei, LI Yun-zhong. Effect of temperature incremental solution heat treatment on the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy[J]. J Central South Univ Technol, 2000, 31: 339−341.