Study on hot deformation behaviuor of Mg-7.1Gd-2.8Y-1.3Nd-0.4Zn magnesium alloy using hyperbolic sine equation and processing maps

Subject Areas : journal of New Materials

Gholam reza Ebrahimi ¹ (Associate Professors, Materials & Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari Univer-sity, Sabzevar,Iran.)
Ehsan Rezaeii Kheybari ² (Ph.D student, Materials & Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University, Sabzevar,Iran.)

Received: 2019-08-23 Accepted : 2020-04-28 Published : 2020-04-20

Keywords: "Mg-RE alloys'', "hot deformation", "hyperbolic sine equatution", "processing maps", "microstructure",

Abstract :

Addition of rare earth (RE) elements to magnesium alloys has developed the Mg-RE alloys having high specific strength to be used in the aerosapace and automobile industries. Deformability of Mg alloys is limited due to hexcagonal closed packed (HCP) structure and the alloys are routinely processed by hot deformation. The aim of this study is investigation of hot deformation behavior and developed a con-stitutive model for Mg-7.1Gd-2.8Y-1.3Nd-0.4Zn (wt%) alloy. Therefore, hot compression tests were performed at temperature interval of 400ºC-475ºC and at strain rates in the range of 0.001s-1-1s-1 with maxiumum strain of 0.6 on as-extruded specimens. The hyperbolic-sine analysis showed that the stress power (n) and the activation energy (Q) of the investigated alloy are 4.92 and 307.42 kJ.mol-1, respectively. The processing maps were drawn based on the dynamic material model (DMM) in the study of the alloy. The maps suggest two stable domains at: (1) 475ºC-0.001s-1 and (2) 425ºC-460ºC at the strain rates of 0.005s-1-0.05s-1, and indicate a wide unstable region below 425ºC.

References:

1- L. L. Rokhlin, "Magnesium alloys containing rare earth metals: structure and properties", Crc Press, 2003         .

2- M. Easton, A. Beer, M. Barnett, C. Davies, G. Dunlop, Y. Durandet, S. Blacket, T. Hilditch and P. Beggs, "Magnesium alloy applications in automotive structures", Jom, 60, 57-62, 2008.     

3- M. R. Barnett, "A taylor model based description of the proof stress of magnesium AZ31 during hot working", Metallurgical and Materials Transactions A, 34, 1799-1806, 2003.

4- A. G. Beer and M. R. Barnett, "Microstructural Development during Hot Working of Mg-3Al-1Zn", Metallurgical and Materials Transactions A, 38, 1856-1867, 2007.

5- H. J. McQueen and N. Ryan, "Constitutive analysis in hot working", Materials Science and Engineering: A, 322, 43-63, 2002.   

6- Y. Prasad, K. Rao and S. Sasidhar, "Hot working guide: a compendium of processing maps", ASM international, 2015    .

7- R. Doherty, D. Hughes, F. Humphreys, J. Jonas, D. J. Jensen, M. Kassner, W. King, T. McNelley, H. McQueen and A. Rollett, "Current issues in recrystallization: A review", Materials Today, 1, 14-15, 1998.

8- F. J. Humphreys and M. Hatherly, "Recrystallization and related annealing phenomena", Elsevier, 2012           .

9- Y. Lin and X.-M. Chen, "A critical review of experimental results and constitutive descriptions for metals and alloys in hot working", Materials & Design, 32, 1733-1759, 2011.   

10- H. Mirzadeh, J. M. Cabrera and A. Najafizadeh, "Modeling and prediction of hot deformation flow curves", Metallurgical and Materials Transactions A, 43, 108-123, 2012.

11- N. Stanford and M. R. Barnett, "The origin of “rare earth” texture development in extruded Mg-based alloys and its effect on tensile ductility", Materials Science and Engineering: A, 496, 399-408, 2008.     

12- Q. Peng, Y. Wu, D. Fang, J. Meng and L. Wang, "Microstructures and properties of Mg–7Gd alloy containing Y", Journal of Alloys and Compounds, 430, 252-256, 2007.

13- Q. Peng, J. Wang, Y. Wu and L. Wang, "Microstructures and tensile properties of Mg–8Gd–0.6 Zr–xNd–yY (x+ y= 3, mass%) alloys", Materials Science and Engineering: A, 433, 133-138, 2006.       

14- J. Nie, X. Gao and S. Zhu, "Enhanced age hardening response and creep resistance of Mg–Gd alloys containing Zn", Scripta Materialia, 53, 1049-1053, 2005.           

15- S. Begum, D. Chen, S. Xu and A. A. Luo, "Low cycle fatigue properties of an extruded AZ31 magnesium alloy", International Journal of Fatigue, 31, 726-735, 2009. 

16- T. Homma, N. Kunito and S. Kamado, "Fabrication of extraordinary high-strength magnesium alloy by hot extrusion", Scripta Materialia, 61, 644-647, 2009.    

17- M. Hoseini-Athar and R. Mahmudi, "Effect of Zn content on hot deformation behavior of extruded Mg–Gd–Zn alloys", Materials Science and Engineering: A, 2019.

18- K. Li, Z. Chen, T. Chen, J. Shao, R. Wang and C. Liu, "Hot deformation and dynamic recrystallization behaviors of Mg-Gd-Zn alloy with LPSO phases", Journal of Alloys and Compounds, 792, 894-906, 2019.        

19- X.-j. Zhou, C.-m. Liu, Y.-h. Gao, S.-n. Jiang, X.-z. Han and Z.-y. Chen, "Evolution of LPSO phases and their effect on dynamic recrystallization in a Mg-Gd-Y-Zn-Zr alloy", Metallurgical and Materials Transactions A, 48, 3060-3072, 2017.       

20- Z. Yu, C. Xu, J. Meng, X. Zhang and S. Kamado, "Microstructure evolution and mechanical properties of as-extruded Mg-Gd-Y-Zr alloy with Zn and Nd additions", Materials Science and Engineering: A, 713, 234-243, 2018.           

21- J. Robson, A. Twier, G. Lorimer and P. Rogers, "Effect of extrusion conditions on microstructure, texture, and yield asymmetry in Mg–6Y–7Gd–0.5 wt% Zr alloy", Materials Science and Engineering: A, 528, 7247-7256, 2011.

22- Q. Qin, Y. Tan, Z. Zhang, Q. Wang and Y. Yang, "Effects of Homogenization on Hot Deformation Behavior of As-Cast Mg-8Gd-3Y-1Nd-0.5 Zr Magnesium Alloy", Journal of Materials Engineering and Performance, 25, 304-311, 2016.      

23- Z. Yu, C. Xu, J. Meng, X. Zhang and S. Kamado, "Effects of pre-annealing on microstructure and mechanical properties of as-extruded Mg-Gd-Y-Zn-Zr alloy", Journal of Alloys and Compounds, 729, 627-637, 2017.

24- C. Xu, M. Zheng, K. Wu, E. Wang, G. Fan, S. Xu, S. Kamado, X. Liu, G. Wang and X. Lv, "Effect of cooling rate on the microstructure evolution and mechanical properties of homogenized Mg–Gd–Y–Zn–Zr alloy", Materials Science and Engineering: A, 559, 364-370, 2013.    

25- C. Xu, M. Zheng, K. Wu, E. Wang, G. Fan, S. Xu, S. Kamado, X. Liu, G. Wang and X. Lv, "Effect of ageing treatment on the precipitation behaviour of Mg–Gd–Y–Zn–Zr alloy", Journal of Alloys and Compounds, 550, 50-56, 2013.  

26- L. Liu and H. Ding, "Study of the plastic flow behaviors of AZ91 magnesium alloy during thermomechanical processes", Journal of Alloys and Compounds, 484, 949-956, 2009.

27- X. Xia, Q. Chen, J. Li, D. Shu, C. Hu, S. Huang and Z. Zhao, "Characterization of hot deformation behavior of as-extruded Mg–Gd–Y–Zn–Zr alloy", Journal of Alloys and Compounds, 610, 203-211, 2014.    

28- Z. Zhang, Z. Yan, Y. Du, G. Zhang, J. Zhu, L. Ren and Y. Wang, "Hot deformation behavior of homogenized Mg-13.5 Gd-3.2 Y-2.3 Zn-0.5 Zr alloy via hot compression tests", Materials, 11, 2282, 2018.       

29- L. Li and X. Zhang, "Hot compression deformation behavior and processing parameters of a cast Mg–Gd–Y–Zr alloy", Materials Science and Engineering: A, 528, 1396-1401, 2011.         

30- S. A. Sani, A. Khorram, A. Jaffari and G. Ebrahimi, "Development of processing map for InX-750 superalloy using hyperbolic sinus equation and ANN model", Rare Metals, 1-10, 2018.          

31- S. Fatemi-Varzaneh, A. Zarei-Hanzaki and M. Haghshenas, "A study on the effect of thermo-mechanical parameters on the deformation behavior of Mg–3Al–1Zn", Materials Science and Engineering: A, 497, 438-444, 2008.  

32- B.-J. Lv, J. Peng, L.-L. Zhu, Y.-J. Wang and A.-T. Tang, "The effect of 14H LPSO phase on dynamic recrystallization behavior and hot workability of Mg–2.0 Zn–0.3 Zr–5.8 Y alloy", Materials Science and Engineering: A, 599, 150-159, 2014. 

33- X. Zhou, C. Liu, Y. Gao, S. Jiang, W. Liu and L. Lu, "Hot compression behavior of the Mg-Gd-Y-Zn-Zr alloy filled with intragranular long-period stacking ordered phases", Journal of Alloys and Compounds, 724, 528-536, 2017.  

34- S. A. Sani, G. Ebrahimi and A. K. Rashid, "Hot deformation behavior and dynamic recrystallization kinetics of AZ61 and AZ61+ Sr magnesium alloys", Journal of Magnesium and Alloys, 4, 104-114, 2016.    

35- Y. V. R. K. Prasad, K. P. Rao, N. Hort and K. U. Kainer, "Hot working parameters and mechanisms in as-cast Mg–3Sn–1Ca alloy", Materials Letters, 62, 4207-4209, 2008.         

36- P. Changizian, A. Zarei-Hanzaki and A. A. Roostaei, "The high temperature flow behavior modeling of AZ81 magnesium alloy considering strain effects", Materials & Design, 39, 384-389, 2012.        

37- Y.-J. Qin, Q.-L. Pan, Y.-B. He, W.-B. Li, X.-Y. Liu and X. Fan, "Modeling of flow stress for magnesium alloy during hot deformation", Materials Science and Engineering: A, 527, 2790-2797, 2010.    

38- O. Sivakesavam and Y. Prasad, "Hot deformation behaviour of as-cast Mg–2Zn–1Mn alloy in compression: a study with processing map", Materials Science and Engineering: A, 362, 118-124, 2003.  

39- R. Ebrahimi and A. Najafizadeh, "Optimization of hot workability in ti-if steel by using the processing map", International journal of iron and steel society, 1, 1-7, 2004.

40- Y. Prasad, H. Gegel, S. Doraivelu, J. Malas, J. Morgan, K. Lark and D. Barker, "Modeling of dynamic material behavior in hot deformation: forging of Ti-6242", Metallurgical Transactions A, 15, 1883-1892, 1984.

41- Y. Prasad and T. Seshacharyulu, "Processing maps for hot working of titanium alloys", Materials Science and Engineering: A, 243, 82-88, 1998.     

42- N. Srinivasan, Y. Prasad and P. R. Rao, "Hot deformation behaviour of Mg–3Al alloy—a study using processing map", Materials Science and Engineering: A, 476, 146-156, 2008.