Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures

doi:10.1007/s40195-016-0454-6

Abstract

Abstract:

A new process consisting of the spray forming and the continuous extrusion forming for manufacturing 7075Al alloy was proposed. The microstructure evolution, mechanical properties and the resistance to stress corrosion cracking of the alloy were studied. The results indicate that the spray forming process induces obviously grain refinement and greatly lower segregation microstructure. Besides, the Conform process produces finer grains and conduces to more uniform distribution of the precipitates of AlCu and MgZn₂ phases. The fabricated alloy shows good comprehensive mechanical properties and superb performance of stress corrosion resistance. Moreover, a better combination of the mechanical properties and the resistance to stress corrosion cracking could then be obtained under a certain condition of atomization gas pressure of 0.19 MPa. The enhanced properties are attributed to the following factors, which include the grain refinement, the fine and homogeneous distribution of AlCu and MgZn₂ phases, the high density of the extruded products, as well as the discontinuous distribution of the grain boundaries after retrogression and reaging (RRA) heat treatment.

Key words: 7075Al alloy, Spray forming, Continuous extrusion forming, Microstructure, Property

Ye-Gao Chen,Yi Zhong,Jiang-Cheng Yin,Li-Qiang Wang,Li-Na Liu,Huan Yang,Ying-Li Liu. Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(9): 804-812.

Figures/Tables 11

Fig. 1 Schematic diagram of the process of directly combined of the spray forming and the continuous extrusion forming

Fig. 2 Optical micrographs of the spray-deposited preform of the 7075Al alloy under different atomization gas pressures: a 0.15 MPa; b 0.17 MPa; c 0.19 MPa; d 0.21 MPa

Fig. 3 Variations of the packing density and the grain size with the atomization gas pressures

Fig. 4 TEM images of the 7075Al alloy under different atomization gas pressures: a 0.15 MPa; b 0.17 MPa; c 0.19 MPa; d 0.21 MPa

Fig. 5 Variations of the relative density of the 7075Al alloy with different gas pressures

Fig. 6 TEM images of the RRA 7075Al alloy under different atomization gas pressures: a 0.17 MPa; b 0.19 MPa

Fig. 7 TEM images of the RRA 7075Al alloy under different atomization gas pressures: a 0.15 MPa; b 0.17 MPa; c 0.19 MPa; d 0.21 MPa

Fig. 8 XRD patterns of the RRA 7075Al alloy with different atomization gas pressures

Fig. 9 Variations of the electrical conductivities of the RRA 7075Al alloy under different atomization gas pressures

Fig. 10 Engineering stress-strain curves of the RRA 7075Al alloy at different gas pressures

Fig. 11 SEM fracture micrographs of the RRA 7075Al alloy under different atomization gas pressures: a 0.15 MPa; b 0.17 MPa; c 0.19 MPa; d 0.21 MPa

References

[1]	Q. Wei, B.Q. Xiong, Y.A. Zhang, B.H. Zhu, L.K. Shi, Trans. Nonferr. Met. Soc. China 11, 258 (2001)
[2]	P. Bai, X. Hou, X. Zhang, C. Zhao, Y. Xing, A 508, 23 (2009)
[3]	J.T. Burns, J.M. Larsen, R.P. Gangloff, Int. J. Fatigue 42, 104 (2012)
[4]	M. Chemingui, G. Mesmacque, A.W. Kolsi, Phys. Proc. 2, 1167(2009)
[5]	X. Fan, D. Jiang, Q. Meng, L. Zhong, Mater. Lett. 60, 1475(2006)
[6]	T.R. Prabhu, Acta Metall. Sin. (Engl. Lett.) 28, 909(2015)
[7]	X.M. Li, M.J. Starink, J. Alloys Compd. 509, 471(2011)
[8]	F. Wang, B.Q. Xiong, Y.A. Zhang, B.H. Zhu, H.W. Liu, X.Q. He, Chin. J. Nonferr. Met. 17, 1058(2007)
[9]	S.H. Wang, L.G. Meng, S.J. Yang, C.F. Fang, H. Hao, S.L. Dai, X.G. Zhang, Trans. Nonferr. Met. Soc. China 21, 1449 (2011)
[10]	Y.P. Xiao, Q.L. Pan, W.B. Li, X.Y. Liu, Y.B. He, Mater. Des. 32, 2149 (2011)
[11]	X.B. Yang, J.Z. Liu, J.H. Chen, C.Y. Wan, L. Fang, P. Liu, C.L. Wu, Acta Metall. Sin. (Engl. Lett.) 27, 1070(2014)
[12]	A.R.E. Met. Mater. 4, 246(1970)
[13]	A. Lawley,Melt atomization and spray deposition, Proceedings of the international conference on spray deposition and melt atomization ( University of Bremen, Bremen, 2000), p. 3
[14]	A. Leatham, Mater. World 4, 317 (1996)
[15]	C. Cui, A. Schulz, K. Schimanski, H.W. Zoch, J. Mater. Process. Technol. 209, 5220(2009)
[16]	N. Raghukiran, R. Kumar, A 641, 138 (2015)
[17]	L. Achelis, V. Uhlenwinkel, R. Ristau, P. Krug, Materialwiss. Werkstofftech. 41, 498(2010)
[18]	B. Cantor, K.H. Baik, P.S. Grant, Prog. Mater Sci. 42, 373(1997)
[19]	H.A. Godinho, A.L.R. J. Alloys Compd. 586, 139(2014)
[20]	M.M. Sharma, M.F. Amateau, T.J. Eden, Acta Mater. 53, 2919(2005)
[21]	F. Wang, B.Q. Xiong, Y.G. Zhang, H.W. Liu, Z.H. Li, Q. Liu, A 518, 144 (2009)
[22]	J.X. Xie, Advanced Processing Technology of Materials (Metallurgical Industry Press, Beijing, 2006), p. 197. (in Chinese)
[23]	X.Y. Zhang, H. Zhang, X.X. Kong, D.F. Fu, Trans. Nonferr. Met. Soc. China 25, 1763 (2015)
[24]	R.G. Guan, Z.Y. Zhao, R.Z. Chao, C. Lian, J.L. Wen, Trans. Nonferr. Met. Soc. China 22, 1182 (2012)
[25]	L. Guo, D.Q. Yi, B. Zhang, B. Wang, H.Q. Liu, G.Q. Liu, Chin. J. Nonferr. Met. 23, 2083 (2013)
[26]	Y.F. Wang, J.C. Yin, D.L. Zheng, Y.L. Liu, Y. Zhong, J. Mater. Sci. Eng. 32, 380(2014)
[27]	C.W. Wang, J.C. Yin, J.B. Zhou, Y.L. Liu, P. Gao, M.H. Li, Y. Zhong, Chin. J. Nonferr. Met. 23, 957(2013)
[28]	G.F. Liang, P. Gao, J.B. Zhou, Y. Zhong, Hot Working Tech. 40, 177(2011)
[29]	P.S. Grant, W.T. Kim, B. Cantor, A 134, 1111 (1991)
[30]	Q. Xu, E.J. Lavernia, Scr. Mater. 41, 535(1999)
[31]	C. Meyer, N. Ellendt, L. M?dler, H.R. Müller, F. Reimer, V. Uhlenwinkel, Materialwiss. Werkstofftech. 45, 642(2014)
[32]	B.L. Zheng, Y.J. Lin, Y.Z. Zhou, E.J. Lavernia, Metall. Mater. Trans. B 40, 768 (2009)
[33]	Y.G. Chen, Y. Zhong, J.C. Yin, L.Q. Wang, H. Yang, L.N. Liu, Y.L. Liu, RSC Adv. 5, 97612(2015)
[34]	Y.D. Jia, F.Y. Cao, S. Guo, P. Ma, J.S. Liu, J.F. Sun, Mater. Des. 53, 79(2014)
[35]	H. Li, Kunming University of Science and Technology, 2015
[36]	L. Kollo, C.R. Bradbury, R. Veinthal, C. J?ggi, E. Carre?o-Morelli, M. Leparoux, A 528, 6606 (2011)
[37]	R.M. Su, Y.D. Qu, R.D. Li, Q.M. Xie, J.H. You, Chin. J. Nonferr. Met. 24, 659(2014)
[38]	K. Ural, J. Mater. Sci. Lett. 13, 383(1994)
[39]	M. Talianker, B. Cina, Metall. Trans. A 20, 2087 (1989)
[40]	X. Kong, H. Zhang, X. Ji, A 612, 131 (2014)
[41]	T.C. Tsai, T.H. Chuang, Corrosion 52, 414 (1996)
[42]	R.M. Su, Y.D. Qu, R.D. Li, Acta Metall. Sin. 50, 863(2014). (in Chinese)
[43]	W. Cai, E.J. Lavernia, Metall. Mater. Trans. B 29, 1085 (1998)
[44]	X. Ji, H. Zhang, S. Luo, F. Jiang, D. Fu, Mater. Sci.Eng., A 649, 128 (2016)