Acta Metallurgica Sinica (English Letters) >
Microstructure Formation Mechanism During a Novel Semisolid Rheo-rolling Process of AZ91 Magnesium Alloy
Received date: 2012-12-16
Revised date: 2013-03-28
Online published: 2013-07-11
Supported by
National Natural Science Foundation for Outstanding Young Scholars of China (No. 51222405), National Natural Science Foundation of China (No. 51034002), the Fok
Ying Tong Education Foundation (No.132002), the Basic Scientific Research Operation of Center University (Nos. N120602002 and N120502001) and Chinese National Program for Fundamental Research and Development (No. 2011CB610405).
A novel semisolid rheo-rolling process of AZ91 alloy was proposed. The microstructure formation mechanism of AZ91 magnesium alloy during the process was studied. The results reveal that the eruptive nucleation and the heterogeneous nucleation exist. During the grain growth process, the grain breakage took place and transformed into fine spherical or rosette grains on the sloping plate gradually, the other grain growth style is direct globular growth. Due to the secondary crystallization of the remnant liquids in the roll gap, the microstructure of the strip becomes finer with the increment of the casting temperature from 650℃ to 690℃. But when the casting temperature reached 710℃, a part of the liquid alloy transformed into the eutectic phases, and the primary grains ripened to form coarse dendrites. In the casting temperature range from 650℃ to 690℃, AZ91 alloy strip with fine spherical or rosette grains was prepared by the proposed process.
Key words： Semisolid; Rolling; AZ91 alloy; Microstructure
Zhanyong ZHAO , Renguo GUAN , Xiang WANG , Chunming LIU . Microstructure Formation Mechanism During a Novel Semisolid Rheo-rolling Process of AZ91 Magnesium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(4) : 447 -454 . DOI: 10.1007/s40195-012-0261-7
[1]J.F. Jiang, Y. Wang and S.J. Luo, Mater. Charact.58 (2007) 190.
[2]M. Celikin, F. Zarandi, D. Sediako and M.O. Pekguleryuz,Can Metall. Q. 48 (2009) 419.
[3]A. Sadeghi and M. Pekguleryuz, Mater. Charact. 62(2011) 742.
[4]L.J. Hu, Y.H. Peng, Y.D. Li and S.R. Zhang, Mater. Manuf.Process. 25 (2010) 880.
[5]N. Giguere, S. Amira, R. Tremblay, C.A. Loong and D.Dube, Can Metall. Q. 47 (2008) 163.
[6]L. Vuong, L. Jiang, J.J. Jonas, S. Godet, B. Verlinden and P. Van Houtte, Can Metall. Q. 47 (2008) 437.
[7]M.C. Flemings, Metall. Trans. A 22 (1991) 957.
[8]Z. Liu, Y.M. Hu and X.M. Liu, Acta Metall. Sin. (Engl.Lett.) 23 (2010) 277.
[9]S. Ji, Z. Fan and M.J. Bevis, Mater. Sci. Eng. A 299 (2001) 210.
[10]H. Mehrara, M. Nili-Ahmadabadi, B. Heidarian, S. Ashouri and J. Ghiasinejad, Solid State Phenom. 141-143 (2008)785.
[11]R.G. Guan, Z.H. Xing, L. Shi, C. Wang and Y. Wang, Mater.Sci. Forum 561-565 (2007) 865.
[12]T. Motegi, Int. J. Mater. Prod. Technol. 2 (2001)468.
[13]P. Kapranos, T. Haga, E. Bertoli and A. Pola, Z. Azpilgain and I. Hurtado, Solid State Phenom. 141-143 (2008) 115.
[14]T. Grimmig, A. Ovcharov, C. Afrath, M. Bunck and A.Buhrig-Polaczek, Solid State Phenom. 116-117 (2006) 484.
[15]P. Babaghorbani, S. Salarfar and M. Nili-Ahmadabadi, Solid State Phenom. 116-117 (2006) 205.
[16]T. Haga, J. Mater. Process. Technol. 130-131(2002) 558.
[17]T. Haga, M. Saito, S. Kumai and H. Watari, Adv. Mater.Res. 97-101 (2009) 1057.
[18]R.G. Guan, Z.Y. Zhao, C. Lian, T. Cui and C.S. Lee, Met.Mater. Int. 19 (2013) 33.
[19]R.G. Guan, Z.Y. Zhao, X.P. Sun, H.Q. Huang, C.G. Dai and Q.S. Zhang, Trans. Nonferrous Met. Soc. China 20 (2010)729.
[20]R.G. Guan, Z.Y. Zhao, H. Zhang, C. Lian and C.S. Lee, J.Mater. Process. Technol. 212 (2012) 1430.
[21]R.G. Guan, Z.Y. Zhao, R.Z. Chao, Z.X. Feng and C.M. Liu,Trans. Nonferrous Met. Soc. China 22 (2012) 2871.
[22]S.M. Yang, Fundamentals of Heat Transfer, Higher Education Press, Beijing, 2003, p.140. (in Chinese)
[23]R.G. Guan, F.R. Cao, L.Q. Chen, J.P. Li and C. Wang, J.Mater. Process. Technol. 209 (2009) 2592.
[24]R.G. Guan, C. Wang, Z.H. Xing, C.S. Lee and F.Y. Hu,Mater. Sci. Technol. 23 (2007) 438.
/
| 〈 |
|
〉 |
WeChat