Mechanical Properties and Machinability of AZ21 and AJ21 Magnesium Alloys

Abstract

AZ21 ve AJ21 Magnezyum Alaşımlarının Mekanik Özellikleri ve İşlenebilirliği Üzerine Karşılaştırmalı Bir Çalışma

Abstract

Bu deneysel çalışmada, Çinko (Zn) ve Stronsiyum'un (Sr) AZ21 ve AJ21 magnezyum alaşımlarının mekanik özellikleri ve işlenebilirliği üzerindeki etkileri araştırılmıştır. Alaşım bileşenlerinin mikroyapıdaki değişime etkisi ve bunların sertlik, mukavemet ile kesme kuvvetlerine (işlenebilirliğe) etkisi incelenmiştir. Deney numunelerinde, alaşım bileşenlerindeki değişimin (%1Zn ve %1Sr), alaşımların mikroyapısını, mekanik özelliklerini ve işlenebilirliğini etkilediği gözlenmiştir. AZ21 alaşımının mekanik özelliklerinin ve işlenebilirliğinin daha yüksek olduğu (kesme kuvvetleri daha düşük) gözlenmiştir. Öte yandan, AJ21 alaşımının ise yüzey kalitesinin daha yüksek olduğu (1.089µm-1.215µm) ve kesme kuvvetlerinin daha yüksek olduğu (55.1N-60.4N) (işlenebilirliğinin daha düşük) görülmüştür. 

Keywords

• İşlenebilirlik,Mekanik özellikler,Magnezyum alaşımları

References

1. [1] J.F.King, "Development of Practical High Temperature Magnesium Casting Alloys,” Magnesium Alloys and Their Applications (Edited by B.L.Mordike and K.U.Kainer), WILEY-VCH Verlag GmbH, Weinheim, Germany, 2000, pp.14-22.
2. [2] S.Schuman ve H.E.Friedrich, “Automotive Applications in Europe,” Magnesium Technology, Metallurgy, Design Data, Applications (Edited by H.E.Friedrich and B.L. Mordike), Springer-Verlag Berlin Heidelberg, Germany, 2006, pp.499-682.
3. [3] M.Kunst, A. Fischersworring-Bunk, G.L’Esperance, P.Plamondon and U.Glatzel, "Microstructure and dislocation analysis after creep deformation of die-cast Mg–Al–Sr (AJ) alloy", Materials Science and Engineering: A, 510, pp.387-392, 2009.
4. [4] H. K. Tönshoff, B. Denkena, R J. Winkler, C. Podolsky, “Machining,” Magnesium Technology, Metallurgy, Design Data, Applications (Edited by H.E.Friedrich and B.L. Mordike), Springer-Verlag Berlin Heidelberg, Germany, 2006, pp. 398-418.
5. [5] B. Akyüz, “Influence of Al content on the machinability of AZ series cast Mg alloys,” Transactions of Nonferrous Metals Society of China, 23, pp. 2243-2249, 2013.
6. [6] J.F.King, "Technology of Magnesium and Magnesium Alloys", Magnesium Technology, Metallurgy, Design Data, Applications (Edited by H.E.Friedrich and B.L. Mordike), Springer-Verlag Berlin Heidelberg, Germany, 2006, pp.219-233
7. [7] B. R. Sunil, K.V. Ganesh, P. Pavan, G. Vadapalli, Ch Swarnalatha, P. Swapna, P. Bindukumar, G. P. K. Reddy, "Effect of aluminum content on machining characteristics of AZ31 and AZ91 magnesium alloys during drilling", Journal of Magnesium and Alloys, vol. 4, pp.15–21, 2016.
8. [8] M. Danish, T. L. Ginta, K. Habib, D. Carou, A.M.A. Rani, and B. B. Saha, " Thermal analysis during turning AZ31 magnesium alloy under dry and cryogenic conditions", Int J Adv Manuf Technol, vol.91, pp.2855–2868, 2017.

9. [9] D. Liu, Z. Liu, E. Wang, "Improving single pass reduction during cold rolling by controlling initial texture of AZ31 magnesium alloy sheet." Transactions of Nonferrous Metals Society of China, vol.28, no 2 pp.244-250, 2018.
10. [10] J. Kubásek, D. Vojtěch, M. Martínek, "Structural characteristics and elevated temperature mechanical properties of AJ62 Mg alloy, Material Characterization, vol.86, pp.270-282, 2013.
11. [11] G. L'espérance, P. Plamondon, M. Kunst, A. Fischersworring-Bunk, "Characterization of intermetallics in Mg–Al–Sr AJ62 alloys", Intermetallics, vol.18, pp.1-7, 2010.
12. [12] M. Kunst, A. Fischersworring-Bunk, G. L'espérance, P. Plamondon, U. Glatzel, "Microstructure and dislocation analysis after creep deformation of die-cast Mg–Al–Sr (AJ) alloy", Materials Science and Engineering A, no.510–511,pp.387–392, 2009.
13. [13] Y. Sun, J. Bai, F.Xue, "Creep Behavior of Two Series Magnesium Alloys", Materials Science Forum, Vols. no.638-642, pp 1596-1601, 2010.
14. [14] J. Kuczmaszewski, I. Zagorski, O. Gziut, S. Legutko, G.M. Krolczyk, "Chip Fragmentation in the Milling of AZ91HP Magnesium Alloy", Strojniski Vestnik/Journal of Mechanical Engineering, vol.63, no.11, 2017.
15. [15] L. Lu, S. Hu, L Liu, Z. Yin, "High speed cutting of AZ31 magnesium alloy", Journal of Magnesium and Alloys, vol.4, pp. 128–134, 2016
16. [16] N. Tomac, K. Tønnesen and T. Mikac, "Study of Influence of Aluminum Content on Machinability of Magnesium Alloys", Strojarstvo,vol. 50, no.6, pp.363-367, 2008.
17. [17] H. Tönshoff, T. Friemuth, J. Winkler and C. Podolsky, “Improving the Characteristics of Magnesium Workpieces by Burnishing Operations,” Magnesium Alloys and Their Applications (Edited by B.L.Mordike and K.U.Kainer), WILEY-VCH Verlag GmbH, Weinheim, Germany, 2000, pp.406-411.
18. [18] M.Ünal, "Magnezyum alaşımlarının döküm özelliklerinin incelenmesi,” Doktora tezi, Metal Eğitimi Bölümü, Gazi Üniversitesi, Ankara, Türkiye, 2008.
19. [19] G. L'espérance, P. Plamondon, M. Kunst and A.Fischersworring-Bunk, “Characterization of intermetallics in Mg–Al–Sr AJ62 alloys,” Intermetallics, vol.18, no.1, pp.1-7, 2010.
20. [20] G.R. Ma, X.L. Li, L. Xiao and Q.F. Li, “Effect of holding temperature on microstructure of an AS91 alloy during semisolid isothermal heat treatment,” Journal of Alloys and Compounds, vol.496, pp.577-581, 2010.
21. [21] Z. Trojanová, G. Farkas, K. Máthis and P. Lukáč, “Hardening and Softening Processes in an AJ51 Magnesium Alloy Reinforced with Short Saffil Fibres”, In Magnesium Technology 2014, Praha, Czech Republic, Springer Cham, 2014, pp. 435- 440.
22. [22] A. Gil-Santos, N. Moelans, N. Hort and O. Van der Biest, “Identification and description of intermetallic compounds in Mg–Si–Sr cast and heat-treated alloys,” Journal of Alloys and Compounds, vol. 669, pp.123-133, 2016.
23. [23] H.K. Tönshoff and J. Winkler, “The Influence of Tool Cutting in Machining of Magnesium,” Surface and Coating Technology, no.94-95, pp.610-616, 1997.
24. [24] K. Liu, X.P. Li and S.Y. Liang, “The mechanism of ductile chip formation in cutting of brittle materials,” Int. J Adv. Manuf. Technology, vol.33, pp.875-884, 2007.
25. [25] X.L. Zhao, Y. Tang, W.J. Deng and F.Y. Zhang, “Effect of Tool Flank Wear on the Orthogonal Cutting Process,” Key Engineering Materials, vol. 329, pp.705-710, 2007.
26. [26] D. A. Stephenson and J.S.Agapiou, Metal Cutting Theory and Practice, Second edition, Danver, USA: Taylor & Francis CRC press, 2016, pp.371-550.
27. [27] W.A.Knight and G.Boothroyd, Fundamentals of Metal Machining and Machine Tools, 3th Ed , Danver, USA: Taylor & Francis CRC Press, 2005, pp.60-320.
28. [28] S. Kalpakjian and S.R. Schmid, Manufacturing Engineering and Technology, 6th Ed., New York, USA: Pearson Prentice Hall., 2010, pp.553-658.
29. [29] M.P. Grover, Principles of Modern Manufacturing, 4th Ed., Hoboken, USA: John Wiley & Sons Inc., 2010, pp.483-584.
30. [30] J.T. Black and R.A. Kohser, Materials & Processes in Manufacturing, 10th Ed., USA: John Wiley&Sons Inc., 2008, pp.50-270.