Effect of Waste Titanium Chips Addition Into the Aluminum Alloys on Their Microstructure

Year 2021, , 1096 - 1105, 01.12.2021

Gökhan Özer , Serhat Acar Alptekin Kısasöz , Kerem Altuğ Güler

https://doi.org/10.35378/gujs.819612

Cited By: 3

Abstract

In the present study, turning chips were preferred to add titanium into liquid aluminum. Although being easy to reach and cheap, the chips were thought to be effective in minor titanium addition with their large surface area. Experimental studies have been carried out with A356 casting alloy and commercial purity aluminum. The effects of different process parameters were investigated on titanium transfer efficiency, microstructural and microhardness properties of the formed phases. The processes were carried out between 740 - 820 °C, for 2, 4, and 6 h, with the amount of added chips 5 and 10 wt.% (3 and 6 vol.%). The experiments were conducted with both commercially pure Al and A356 alloy. The microstructural investigations and microhardness measurements were carried out on the formed Al3Ti and (Al, Si)3Ti phases. The first noticeable result was that titanium transfer was more efficient in pure aluminum than in the A356 alloy. Also, it was observed that this difference became more significant with an increase in wt.% addition. The measured microhardness values were also differentiated depending on the Si content of the formed Al3Ti compound. Due to the presence of high Si content in A356 alloy, transference efficiencies of Ti were found highly limited compared to pure aluminum as the silicon enrichment in the Al3Ti compound reduces the diffusion of titanium and the growth rate of Al3Ti particles. Maximum transference efficiency was found 47.05% with 10 %wt. chip addition in commercially pure aluminum at the processing conditions of 780 °C for 4 h.   

Keywords

Aluminum, Titanium, Al3Ti /TiAl3, Turning chips, In-situ composite

References

• [1] Hirsch, J., “Recent development in aluminium for automotive applications”, Trans. Nonferrous Mat. Soc. China, 24: 1995-2002, (2014).
• [2] Dursun, T. and Soutis, C., “Recent developments in advanced aircraft aluminium alloys”, Mater. Des., 56: 862-871, (2014).
• [3] Habibolahzadeh, A., Hassani, A., Bagherpour, E. and Taheri, M., “Dry friction and wear behavior of in-situ Al/Al3Ti composite”, J. Compos. Mater., 48: 1049-1059, (2014).
• [4] Wang, K., Li, W., Du, J., Tang, P. and Chen, J., “Preparation, thermal analysis and mechanical properties of in-situ Al2O3/SiO2(p)/Al composites fabricated by using zircon tailing sand”, Mater. and Des., 99: 303-313, (2016).
• [5] Chao, Z. L., Zhang, L. C., Jiang, L. T., Qiao, J., Xu, Z. G., Chi, H. T. and Wu, G.H., “Design, microstructure and high temperature properties of in-situ Al3Ti and nano-Al2O3 reinforced 2024Al matrix composites from Al-TiO2 system”, J. Alloys and Compd., 775: 290-297, (2019).
• [6] Ahmadvand, M. S., Azarniya, A. and Madaah, H. R., “Thermomechanical synthesis of hybrid in-situ Al-(Al3Ti+Al2O3) composites through nanoscale Al-Al2TiO5 reactive system”, J. Alloys and Compd., 789: 493-505, (2019).
• [7] Azarniya, A., Taheri, A. K. and Taheri, K. K., “Recent advances in ageing of 7xxx series aluminum alloys: A physical metallurgy perspective”, J. Alloys and Compd., 781: 945-983, (2019).
• [8] Ma, S., Zhuang, X. and Wang, X., “3D micromechanical simulation of the mechanical behavior of an in-situ Al3Ti/A356 composite”, Compos. Part B Eng., 176: 107-115, (2019).
• [9] Tochaee, E. B., Madaah, H. R. and Reihani, S. M., “Fabrication of high strength in-situ Al-Al3Ti nanocomposite by mechanical alloying and hot extrusion: Investigation of fracture toughness”, Mater. Sci. Eng. A., 658: 246-254, (2016).
• [10] Guo, B., Ni, S., Shen, R. and Song, M., “Fabrication of Ti-Al 3 Ti core-shell structured particle reinforced Al based composite with promising mechanical properties”, Mater. Sci. Eng. A., 639: 269-273, (2015).
• [11] Zhang, Q., Xiao, B. L., Wang, D. and Ma, Z. Y., “Formation mechanism of in situ Al3Ti in Al matrix during hot pressing and subsequent friction stir processing”, Mater. Chem. Phys., 130: 1109-1117, (2011).
• [12] Hsu, C. J., Chang, C. Y., Kao, P. W., Ho, N. J. and Chang, C. P., “Al-Al3Ti nanocomposites produced in situ by friction stir processing”, Acta Mater., 54: 5241-5249, (2006).
• [13] Chatterjee, S., Ghosh, A. and Basu, M. A., “Understanding the evolution of microstructural features in the in-situ intermetallic phase reinforced Al/Al3Ti nanocomposite”, Mater. Today Proc., 5: 10118-10130, (2018).
• [14] Gupta, R., Chaudhari, G. P. and Daniel, B. S. S., “Strengthening mechanisms in ultrasonically processed aluminium matrix composite with in-situ Al3Ti by salt addition”, Compos. Part B Eng., 140: 27-34, (2018).
• [15] Zeng, Y., Himmler, D., Randelzhofer, P. and Körner, C., “Microstructures and Mechanical Properties of Al3Ti/Al Composites Produced In Situ by High Shearing Technology”, Adv. Eng. Mater., 21: 1-10, (2019).
• [16] Chen, X. H., Yan, H. and Jie, X. P., “Effects of ti addition on microstructure and mechanical properties of 7075 alloy”, Int. J. Cast Met. Res., 28: 151-157, (2015).
• [17] Liu, Z., Han, Q. and Li, J., “Fabrication of in situ Al3Ti/Al composites by using ultrasound assisted direct reaction between solid Ti powders and liquid Al”, Powder Technol., 247: 55-59, (2013).
• [18] Yang, C., Liu, Z., Zheng, Q., Cao, Y., Dai, X., Sun, L., Zhao, J., Xing, J. and Han, Q., “Ultrasound assisted in-situ casting technique for synthesizing small-sized blocky Al3Ti particles reinforced A356 matrix composites with improved mechanical properties”, J. Alloys and Compd., 747: 580-590, (2018).