Dynamic Recrystallization Behavior of Mg-Gd-Y-Zr Alloy during Hot Compression

Abstract:

Dynamic recrystallization behavior of Mg-8.0Gd-3.0Y-0.5Zr (wt.%) alloy and the critical conditions corresponding to the onset of dynamic recrystallization were investigated using uniaxial compression tests conducted at temperatures ranging from 350 °C to 500 °C and strain rates ranging from 0.001 s^-1 to 1 s^-1. Results show that increasing temperature and/or decreasing strain rate can enhance the process of dynamic recrystallization of Mg-8.0Gd-3.0Y-0.5Zr alloy and lower the peak stress and corresponding strain. However, decreasing temperature and/or increasing strain rate can promote the occurrence of twin dynamic recrystallization (TDRX) within the original grains at the cost of reducing the total volume fraction of dynamically recrystallized grains in the microstructure. Besides, the critical stress and strain corresponding to the onset of dynamic recrystallization of Mg-8.0Gd-3.0Y-0.5Zr at 400 °C and 0.1 s^-1 are 173MPa and 0.13, respectively.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 181-185
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.181
• Online since: March 2016
• Authors: Shi Lun Yu, Yong Hao Gao, Cu Ming Liu, Hong Chao Xiao
• Keywords: Critical Condition, Dynamic Recrystallization, Hot Compression, Mg-Gd-Y-Zr Alloy, TDRX

References

[1] Z. Yang, J. Li, J. Zhang, G. Lorimer, J. Robson, Review on Research and Development of Magnesium Alloys, Acta Metallurgica Sinica (English Letters), 21 (2008) 313-328.

DOI: 10.1016/s1006-7191(08)60054-x

[2] B. Mordike, Creep-resistant magnesium alloys, Materials Science and Engineering: A, 324 (2002) 103-112.

DOI: 10.1016/s0921-5093(01)01290-4

[3] K. Hono, C. Mendis, T. Sasaki, K. Oh-Ishi, Towards the development of heat-treatable high-strength wrought Mg alloys, Scripta Materialia, 63 (2010) 710-715.

DOI: 10.1016/j.scriptamat.2010.01.038

[4] S. Agnew, J. Nie, Preface to the viewpoint set on: The current state of magnesium alloy science and technology, Scripta Materialia, 63 (2010) 671-673.

DOI: 10.1016/j.scriptamat.2010.06.029

[5] X. Wu, X. Yang, J. Ma, Q. Huo, J. Wang, H. Sun, Enhanced stretch formability and mechanical properties of a magnesium alloy processed by cold forging and subsequent annealing, Materials & Design, 43 (2013) 206-212.

DOI: 10.1016/j.matdes.2012.06.065

[6] Q. Huo, X. Yang, H. Sun, B. Li, J. Qin, J. Wang, J. Ma, Enhancement of tensile ductility and stretch formability of AZ31 magnesium alloy sheet processed by cross-wavy bending, Journal of Alloys and Compounds, 581 (2013) 230-235.

DOI: 10.1016/j.jallcom.2013.06.185

[7] C. Bettles, M. Gibson, Current wrought magnesium alloys: Strengths and weaknesses, JOM, 57 (2005) 46-49.

DOI: 10.1007/s11837-005-0095-0

[8] S. Kamado, Y. Kojima, Development of Magnesium Alloys with High Performance, Materials Science Forum, 546 (2007) 55-64.

DOI: 10.4028/www.scientific.net/msf.546-549.55

[9] T. Mukai, H. Watanabe, K. Higashi, Application of superplasticity in commercial magnesium alloy for fabrication of structural components, Materials Science & Technology, volume 16 (2000) 1314-1319(1316).

DOI: 10.1179/026708300101507163

[10] Humphreys F J, Hatherly M, Recrystallization and Related Annealing Phenomena, New York, (1995).

[11] T. Al-Samman, G. Gottstein, Dynamic recrystallization during high temperature deformation of magnesium, Materials Science & Engineering A, 490 (2008) 411–420.

DOI: 10.1016/j.msea.2008.02.004

[12] O. Sitdikov, R. Kaibyshev, Dynamic Recrystallization in Pure Magnesium, Materials Transactions, 42 (2001) 1928-(1937).

DOI: 10.2320/matertrans.42.1928

[13] É. Martin, J.J. Jonas, Evolution of microstructure and microtexture during the hot deformation of Mg–3% Al, Acta Materialia, 58 (2010) 4253–4266.

DOI: 10.1016/j.actamat.2010.04.017

[14] A. Galiyev, R. Kaibyshev, G. Gottstein, Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60, Acta Materialia, 49 (2001) 1199–1207.

DOI: 10.1016/s1359-6454(01)00020-9

[15] H.C. Xiao, S.N. Jiang, B. Tang, W.H. Hao, Y.H. Gao, Z.Y. Chen, C.M. Liu, Hot deformation and dynamic recrystallization behaviors of Mg–Gd–Y–Zr alloy, Materials Science and Engineering: A, 628 (2015) 311-318.

DOI: 10.1016/j.msea.2015.01.041

[16] E.I. Poliak, J.J. Jonas, Initiation of Dynamic Recrystallization in Constant Strain Rate Hot Deformation, Isij International, 43 (2003) 684-691.

DOI: 10.2355/isijinternational.43.684

[17] E.I. Poliak, J.J. Jonas, A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization, Acta Materialia, 44 (1996) 127–136.

DOI: 10.1016/1359-6454(95)00146-7