Received: 01st May 2021; Revised: 18th September 2021, 12th November 2021; Accepted: 13th November 2021


  • Krzysztof Topolski Faculty of Materials Science and Engineering, Warsaw University of Technology, Warsaw, Poland




Homogeneity, Titanium, Chips, Recycling, Structure, Properties


This work presents a promising method for recycling chips, carried out in the solid-state with the use of plastic working. High-purity (hp) titanium 99.99 chips after milling were subjected to a three-step procedure to transform these chips into a solid material. The objective of this work is to demonstrate the potential of this new processing method and to present the results of experiments conducted to determine the homogeneity of the final product. It was found that the processing method employed resulted in the formation of a solid and consolidated product in the form of a rod 8mm in diameter and 700mm long. The rod exhibited a grained microstructure typical of the Ti in the as-received state. Furthermore, the mechanical properties of the rod-product were also similar to those of titanium in the as-received state. For example, the hardness of the manufactured rod (average 97 HV10) was typical of the hardness of commercial Ti hp (94 HV10). In addition, the product obtained was characterized by adequate homogeneity in terms of its microstructure and mechanical properties. It was also found that the recycled material is as homogeneous as the commercial, reference Ti in the as-received state.


Bingbing, W., Weiping, C., Tiwen, L., Fangfang, L., Zhenfei, J., Mengdi, M. (2017). Review of solid-state recycling of aluminium chips. Resources, Conservation & Recycling, vol. 125 (2017), p.37-47. https://doi.org/10.1016/j.resconrec.2017.06.004

Kent, D., Rashid, R.R., Bermingham, M., Attar, H., Sun, S., and Dargusch, M. (2018). Insights into Machining of a Titanium Biomedical Alloy from Chip Microstructures. Metals, vol.8, p.710. https://doi.org/10.3390/met8090710

Lapovok, R., Qi, Y., Ng, H.P., Maier, V., Estrin, Y. (2014). Multicomponent materials from machining chips compacted by equal-channel angular pressing. J Mater Sci (2014), vol. 49, p.1193-1204. https://doi.org/10.1007/s10853-013-7801-z

Luo, P. (2020). Quantitative Analysis of Strengthening Effect Contributed by Microstructure Characteristics in Pure Titanium Consolidated by Severe Plastic Deformation. Journal of Materials Engineering and Performance, vol.29, p.769–775, https://doi.org/10.1007/s11665-020-04601-7

Luo, P., Xie, H., Paladugu, M., Palanisamy, S., Dargusch, M. S., Xia, K. (2010). Recycling of titanium machining chips by severe plastic deformation consolidation. J Mater Sci 45, (2010), p.4606–4612. https://doi.org/10.1007/s10853-010-4443-2

Nouari, M., Makich, H. (2014). On the Physics of Machining Titanium Alloys: Interactions between Cutting Parameters, Microstructure and Tool Wear. Metals, vol.4, p.335-358, https://doi.org/10.3390/met4030335

Peng, T., Wang, Q.D., Han, Y.K., Zheng, J., Guo, W. (2010). Consolidation behaviour of Mg–10Gd–2Y–0.5Zr chips during solid-state recycling. Journal of Alloys and Compounds; vol. 503 (2010); p.253-259. https://doi.org/10.1016/j.jallcom.2010.05.011

Shamsudin, S., Lajis, M.A., Zhong, Z.W. (2016). Evolutionary in Solid State Recycling Techniques of Aluminium: A review. Procedia CIRP 40; (2016); p.256-261. https://doi.org/10.1016/j.procir.2016.01.117

Topolski, K., Jaroszewicz, J., and Garbacz, H. (2021). Structural Aspects and Characterization of Structure in the Processing of Titanium Grade4 Different Chips. Metals 2021; vol.11; Issue1; p.101-124. https://doi.org/10.3390/met11010101

Wen, L., Ji, Z., Li, X., and Xin M. (2010). Effect of Heat Treatment on Microstructure and Mechanical Properties of ZM6 Alloy Prepared by Solid Recycling Process. Journal of Materials Engineering and Performance, vol. 19(1), February 2010, p.107-111. https://doi.org/10.1007/s11665-009-9360-7

Zhilyaev, A.P., Gimazov, A.A., Raab, G.I., Langdon, T.G. (2008). Using high-pressure torsion for the cold-consolidation of copper chips produced by machining. Materials Science and Engineering A 486, (2008), p.123-126. https://doi.org/10.1016/j.msea.2007.08.070




How to Cite

Topolski, K. (2021). HOMOGENEITY OF TITANIUM MANUFACTURED BY SOLID STATE CHIPS RECYCLING: Received: 01st May 2021; Revised: 18th September 2021, 12th November 2021; Accepted: 13th November 2021. MATTER: International Journal of Science and Technology, 7(3), 16–28. https://doi.org/10.20319/mijst.2021.73.1628