Influence of AlCuSc Ternary Phase on the Microstructure and Properties of 1469 Alloy

Abstract:

Microstructure evolution and mechanical properties of a 1469 alloy and a Sc-free1469 type alloy were examined. SEM observation indicates that AlCuSc ternary phases (W) are formed after homogenization annealing, and cannot be dissolved during the following heat treatments. These coarse particles consume abundant Cu atoms from the Al matrix that are available for solutioning, which results in the decrease of precipitation of the T1 phase during aging treatment. The W phase has negative effects on the examined alloy’s mechanical properties. The tensile strength of Sc-added alloy is 40MPa lower than that of the Sc-free alloy. The formation of the W phase has a close relationship with Cu/Sc ratio, which shows the importance of controlling the concentration of Cu and addition of Sc. Formation of W phase suppress the effect of precipitation hardening of the T1 phase in high strength Al-Cu-Li alloys

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 1057-1062
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.1057
• Online since: June 2014
• Authors: Min Jia, Zi Qiao Zheng*, Xian Fu Luo
• Keywords: AlCuSc Phase, Al-Li Alloy, Microalloying, Sc

References

[1] V. Davydov, T. Rostova, V. Zakharov, Y.A. Filatov, V. Yelagin, Materials Science and Engineering: A, 280 (2000) 30-36.

DOI: 10.1016/s0921-5093(99)00652-8

[2] S. Iwamura, M. Nakayama, Y. Miura, , Materials Science Forum, Trans Tech Publ, 2002, pp.1151-1156.

[3] J. Röyset, Metall. Sci. Technol., 25 (2007) 11-21.

[4] J. Dutkiewicz, O. Simmich, R. Scholz, R. Ciach, Materials Science and Engineering: A, 234 (1997) 253-257.

DOI: 10.1016/s0921-5093(97)00229-3

[5] M.Y. Teslyuk, V. Protasov, Soviet Phys. -Cryst. (Engl. Transl. ), 10 (1966).

[6] M. Kharakterova, D. Eskin, L. Toropova, Acta metallurgica et materialia, 42 (1994) 2285-2290.

DOI: 10.1016/0956-7151(94)90307-7

[7] L. Toropova, D. Eskin, M. Kharakterova, T. Dobatkina, Advanced aluminum alloys containing scandium: structure and properties, (Gordon & Breach Science Publishers, Newark, NJ), (1998), 175.

DOI: 10.4324/9781315097541

[8] M. Gazizov, V. Teleshov, V. Zakharov, R. Kaibyshev, Journal of Alloys and Compounds, 509 (2011) 9497-9507.

DOI: 10.1016/j.jallcom.2011.07.050

[9] I. Fridlyander, O. Grushko, V. Shamrai, G. Klochkov, Metal Science and Heat Treatment, 49 (2007) 279-283.

DOI: 10.1007/s11041-007-0049-y

[10] Røyset, N. Ryum, International Materials Reviews, 50 (2005) 19-44.

[11] Y. Miura, K. Horikawa, K. Yamada, M. Nakayama, Proc. the 4th Int. Conf. on Aluminum Alloys, 1994, pp.161-168.

[12] A. Norman, P. Prangnell, R. McEwen, Acta Materialia, 46 (1998) 5715-5732.

DOI: 10.1016/s1359-6454(98)00257-2

[13] K. Hyde, A. Norman, P. Prangnell, Acta Materialia, 49 (2001) 1327-1337.