AM Serisi Magnezyum Alaşımlarının Termal Özellikleri

Abstract

Bu makale, AM serisi döküm magnezyum alaşımlarının termal özellikleri (termal yayılma ve termal iletkenlik) üzerine deneysel araştırmalar sunmaktadır. Alaşımlardaki Al içeriğindeki değişimin (2'den 9 Al’e ve sabit 0.5 Mn, ağırlıkça %) ısıl özellikler, yoğunluk ve sertlik üzerindeki etkileri karşılaştırmalı olarak analiz edilmiştir. Alaşımların mikroyapısında bulunan intermetalik fazların (Mg17Al12 ve Al8Mn5) ısıl yayınım, ısıl iletkenlik, yoğunluk ve ayrıca sertlik üzerine etkisi olduğu görülmüştür. Alaşımın ısıl özellikleri, alaşımdaki Al içeriği arttıkça azalmıştır. Alaşımların termal özellikleri artan sıcaklıkla artmıştır (sıcaklık 25 °C’den- 400 °C’e kadar). En yüksek termal difüzivite AM20 alaşımında ve en düşük termal difüzivite ise AM90 alaşımında gözlenmiştir.

Keywords

• Thermal Difüzivite
• Termal İletkenlik
• Yoğunluk
• Magnezyum Alaşımları
• Sertlik

Thermal Properties of AM Series Magnesium Alloys

Abstract

This paper presents experimental investigation on thermal properties (thermal diffusivity and thermal conductivity) of AM series cast magnesium alloys. The effects of the changing in Al content (from 2 to 9 Al and constantly 0.5 Mn, wt. %) in the alloys on thermal properties, density and hardness were comparatively analyzed. It was observed that intermetallic phases (Mg17Al12 ve Al8Mn5) found in the microstructure of the alloys have an effect on thermal diffusivity, thermal conductivity, density and also hardness. The thermal properties of the alloys were decrease with increasing Al content in the alloy. The thermal properties of the alloys were increase with increasing temperature (the temperature range from 25°C to 400°C). The highest thermal diffusivity was measured on AM20 alloy and the lowest thermal diffusivity were observed on AM90 alloy.

Keywords

• Thermal Diffusivity
• Thermal Conductivity
• Density
• Magnesium Alloys
• Hardness

Thanks

The author would like to thanks to Bilecik Şeyh Edebali University for support (2013-02 BİL.03-01 and 2016-02.BŞEÜ.03-02).

References

1. Friedrich, H. E. & Mordike, B. L. (2006). Magnesium Technology, 12, Springer-Verlag. Berlin.
2. Mehta, D. S., Masood, S. H. & Song, W. Q. (2004). Investigation of wear properties of magnesium and aluminum alloys for automotive applications. Journal of Materials Processing Technology, 155, 1526-1531.
3. Tönshoff, H. K., Denkena, B., Winkler, R. J. & Podolsky, C. (2006). Machining, magnesium technology, metallurgy, design data, applications. Verlag Berlin Heidelberg: Springer, 398.
4. Mordike, B. L. & Ebert, T. (2001). Magnesium: properties-applications potential. Materials Science and Engineering: A, 302(1), 37-45.
5. Unal, M. (2008). An Investigation of Casting Properties of Magnesium Alloys. PhD Thesis. Ankara, Gazi University, Institute of Science and Technology.
6. Akyüz, B. (2011). Machinability of magnesium and its alloys. TOJSAT, 1(3), 31-38.
7. Akyüz, B. (2018). Influence of Al content on machinability of AM series magnesium alloys. Kovove Mater, 56, 289-295.
8. Akyüz, B. (2019). Wear and machinability of AM series magnesium alloys. Materials Testing, 61(1), 49-55.

9. Tomac, N., Tønnesen, K. & Mikac, T. (2008). Study of influence of aluminum content on machinability of magnesium alloys, Strojarstvo, 50(6), 363-367.
10. Tönshoff, H. K. & Winkler, J. (1997). The influence of tool coatings in machining of magnesium. Surface and Coating Technology, 94-95, 610-616.
11. Zhao, N., Hou, J. & Zhu, S. (2011). Chip ignition in research on high-speed face milling AM50A magnesium alloy. In 2011 Second International Conference on Mechanic Automation and Control Engineering, 1102-1105. IEEE.
12. Kuczmaszewski, J., Zagorski, I., Gziut, O., Legutko, S. & Krolczyk, G. M. (2017). Chip fragmentation in the milling of AZ91HP magnesium alloy. Strojniski Vestnik/Journal of Mechanical Engineering, 63(11), 628-642.
13. Zagórski, I. & Kuczmaszewski, J. (2016). Study of chip ignition and chip morphology after milling of magnesium alloys. Advances in Science and Technology Research Journal, 10(32).
14. Hou, J., Zhao, N. & Zhu, S. (2011). Influence of cutting speed on flank temperature during face milling of magnesium alloy. Materials and Manufacturing Processes, 26(8), 1059-1063.
15. Danish, M., Ginta, T. L., Habib, K., Carou, D., Rani, A. M. A. & Saha, B. B. (2017). Thermal analysis during turning of AZ31 magnesium alloy under dry and cryogenic conditions. The International Journal of Advanced Manufacturing Technology, 91(5), 2855-2868.
16. Liu, K., Li, X. P. & Liang, S. Y. (2007). The mechanism of ductile chip formation in cutting of brittle materials. Int J Adv. Manuf. Technology, 33, 875-884.
17. Tekumalla, S. & Gupta, M. (2017). An insight into ignition factors and mechanisms of magnesium based materials: A review. Materials & Design, 113, 84-98.
18. Lee, S., Ham, H. J., Kwon, S. Y., Kim, S. W. & Suh C. M. (2013). Thermal conductivity of magnesium alloys in the temperature range from 125 °C to 400 °C. International Journal of Thermophysics, 34(12), 2343-2350.
19. Rudajevová, A. & Lukáč, P. (2005). Comparison of the thermal properties of AM20 and AS21 magnesium alloys. Materials Science and Engineering: A, 397(1-2), 16-21.
20. Ma, Y., Zhang, J. & Yang, M. (2009). Research on microstructure and alloy phases of AM50 magnesium alloy. Journal of Alloys and Compounds, 470(1-2), 515-521.
21. She, J., Pan, F. S., Hu, H. H., Tang, A. T., Yu, Z. W. & Song, K. (2015). Effect of Mg 2 Sn intermetallic on the grain refinement in As-cast AM series alloy. Journal of Materials Engineering and Performance, 24(8), 2937-2943.
22. Gopi, K. R., Nayaka, H. S. & Sahu, S. (2017). ). Microstructural evolution and strengthening of AM90 magnesium alloy processed by ECAP. Arabian Journal for Science and Engineering, 42(11), 4635-4647.
23. Huang, X., Suzuki, K., Chino, Y. & Mabuchi, M. (2015). Influence of aluminum content on the texture and sheet formability of AM series magnesium alloys. Materials Science and Engineering: A, 633, 144-153.
24. Tsuchiya, T., Watanabe, K., Matsuda, K., Kawabata, T., Sakakibara, K., Yamaguchi, T. & Ikeno, S. (2012). Effect of Al and Mn contents on microstructure in AM-series magnesium alloys. In Advanced Materials Research, 409, 379-382. Trans Tech Publications Ltd.
25. Cengel, Y. A. & Ghajar, A. J. (2015). Heat and Mass Transfer: Fundamentals and Applications (Fifth Edition), Mc Graw Hill., New York.
26. Chunming, W., Yungui, C., Sufen, X., Wucheng, D. & Xia, L. (2013). Thermal Conductivity and Mechanical Properties of as-Cast Mg-3Zn-(0.5∼ 3.5) Sn Alloys. Rare Metal Materials and Engineering, 42(10), 2019-2022.
27. Stephenson, D. A. & Agapiou, J. S. (2016). Metal cutting theory and practice. CRC press.
28. Kalpakjian,S. & Schmid, S. R. (2010). Manufacturing Engineering and Technology. Prentice Hall.
29. Knight, W. A. & Boothroyd, G. (2005). Fundamentals of metal machining and machine tools, 198.
30. Grover, M. P. (2010). Principles of Modern Manufacturing (4th Ed.) John Wiley & Sons, Inc.