Abstract: The effect of pre-deformation on the precipitation behavior and mechanical property of Al-Cu-Li-Mn-Zr alloy were investigated by Vickers hardness measurement, room-temperature tensile test and transmission electron microscopy (TEM) characterization. The results showed that in the peak aged Al-Cu-Li-Mn-Zr alloy without pre-deformation, the T1 and θ' phases were usually dominant, while the amount of χ phase was very limited. When this alloy was subjected to the pre-deformation prior to aging, the formation of T1 was promoted, and the nucleation of θ' was inhibited, while there was little influence on the formation of χ phase. Therefore, the T1 phase was primary precipitate in the aged alloy with pre-strain. With the increase of pre-strain, although the diameter of the T1 precipitates became smaller, the thickness and volume fraction of them kept almost the same. In addition, when larger pre-strain was applied, the alloy showed higher strength and lower plasticity.
1 Rioja R J. Fabrication methods to manufacture isotropic Al-Li alloys and products for space and aerospace applications[J]. Materials Science and Engineering: A, 1998, 257(1): 100. 2 Gayle F W, Heubaum F H, Pickens J R. Structure and properties during aging of an ultra-high strength Al-Cu-Li-Ag-Mg alloy[J]. Scripta Metallurgica et Materialia, 1990, 24(1): 79. 3 Starke E A, Staley J T. Application of modern aluminum alloys to aircraft[J]. Progress in Aerospace Science, 1996, 32(2-3): 131. 4 Giummarra C, Thomas B, Rioja R J. New aluminum lithium alloys for aerospace applications[C]∥Proceedings of the Light Metals Technology Conference, 2007, 184: 19. 5 Warner T. Recently-developed aluminium solutions for aerospace applications[J].Materials Science Forum, 2006, 519: 1271. 6 Davis J R. Aluminium and aluminium alloys[M].Ohio: ASM International, 1993. 7 Dorin T, Deschamps A, Geuser F D, et al. Quantification and mo-delling of the microstructure/strength relationship by tailoring the morphological parameters of the T1 phase in an Al-Cu-Li alloy[J]. Acta Materialia, 2014, 75(15): 134. 8 Gable B M, Zhu A W, Csontos A A, et al. The role of plastic deformation on the competitive microstructural evolution and mechanical properties of a novel Al-Li-Cu-X alloy[J]. Journal of Light Me-tals, 2001, 1(1): 1. 9 Cassada W A, Shiflet G J, Starke E A. The effect of plastic defor-mation on Al2CuLi (T1) precipitation[J]. Metallurgical and Mate-rials Transactions A, 1991, 22(2): 299. 10 Ringer S P, Muddle B C, Polmear I J. Effects of cold work on precipitation in Al-Cu-Mg-(Ag) and Al-Cu-Li-(Mg-Ag) alloys[J]. Metallurgical and Materials Transactions A, 1995, 26(7): 1659. 11 Martin J W. Precipitation hardening: Theory and applications[M]. Butterworth-Heinemann, 2012. 12 Tsivoulas D, Prangnell P B. Comparison of the effect of individual and combined Zr and Mn additions on the fracture behavior of Al-Cu-Li alloy AA2198 rolled sheet[J]. Metallurgical and Materials Tran-sactions A, 2014, 45(3): 1338. 13 Rodgers B I, Prangnell P B. Quantification of the influence of increased pre-stretching on microstructure-strength relationships in the Al-Cu-Li alloy AA2195[J]. Acta Materialia, 2016, 108(15): 55. 14 Pan Z, Zheng Z, Liao Z, et al. New cubic precipitate in Al-3.5Cu-1.0Li-0.5In (wt.%) alloy[J].Materials Letters,2010,64(8):942. 15 Hornbogen E. Formation of nm-size dispersoids from supersaturated solid solutions of aluminium[J].Materials Science Forum, 2000, 331: 879. 16 Li D, Chen L. Computer simulation of stress-oriented nucleation and growth of θ' precipitates in Al-Cu alloys[J]. Acta Materialia, 1998, 46(8): 2573. 17 Huang J C, Ardell A J. Strengthening mechanisms associated with T1 particles in two Al-Li-Cu alloys[J]. Le Journal de Physique Colloques, 1987, 48(C3): 373. 18 Noble B, Thompson G E. T1 (Al2CuLi) precipitation in aluminium-copper-lithium alloys[J]. Metal Science Journal, 1972, 6(1): 167.
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2018, Vol. 32 
