Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part I: sintering and densification en en Five TiAl–Ti3AlC2 composite samples containing (10, 15, 20, 25 and 30 wt% Ti3AlC2 MAX phase) were prepared by spark plasma sintering technique at 900 °C for 7 min under 40 MPa. For this purpose, metallic titanium and aluminum powders (aiming at the in-situ formation of the TiAl matrix phase) were ball-milled with predetermined contents of Ti3AlC2 MAX phase, which already was synthesized using the same metallic powders as well as graphite flakes. Displacement-time-temperature variations during the heating and sintering steps, displacement rate versus temperature, displacement rate versus time, and densification behavior were studied. Two sharp changes were detected in the diagrams: the first one, ~16 min after the start of the heating process due to the melting of Al, and the second one, after ~35 min because of the sintering progression and the applied final pressure. The highest relative densities were measured for the samples doped with 20 and 25 wt% Ti3AlC2 additives. More Ti3AlC2 addition resulted in decreased relative density because of the agglomeration of MAX phase particles. 169 175 Maryam Akhlaghi Central Reference Laboratory Iran University of Science and Technology, Narmak, Tehran, 16844 Iran Esmaeil Salahi Ceramics Department, Materials and Energy Research Center (MERC), Karaj Iran e-salahi@merc.ac.ir Seyed Ali Tayebifard Semiconductors Department, Materials and Energy Research Center (MERC), Karaj Iran Gert Schmidt Faculty of Mechanical, Process and Energy Engineering TU Bergakademie, Freiberg Germany In-situ TiAl Ti3AlC2 MAX phase Spark plasma sintering DTT graphs Densification Vol 1 No 3 Paper 5.pdf [1] Z. Duan, Y. Han, X. Song, H. Chen, Creep behaviour of equiaxed fine-grain γ-TiAl-based alloy prepared by powder metallurgy, Mater. Sci. Technol. 36 (2020) 1457–1464. https://doi.org/10.1080/02670836.2020.1790098. ##[2] H.P. Lim, W.Y.H. Liew, G.J.H. Melvin, Z.-T. Jiang, A Short Review on the Phase Structures, Oxidation Kinetics, and Mechanical Properties of Complex Ti-Al Alloys, Materials (Basel). 14 (2021) 1677. https://doi.org/10.3390/ma14071677. ##[3] H. Huang, H. Ding, X. Xu, R. Chen, J. Guo, H. Fu, Phase transformation and microstructure evolution of a beta-solidified gamma-TiAl alloy, J. Alloys Compd. 860 (2021) 158082. https://doi.org/10.1016/j.jallcom.2020.158082. ##[4] M.-P. Bacos, S. Ceccacci, J.-P. Monchoux, C. Davoine, T. Gheno, et al., Oxidation Behavior of a Spark Plasma Sintered Ti–48Al–2W–0.1B Alloy at 800 °C, Oxid. Met. 93 (2020) 587–600. https://doi.org/10.1007/s11085-020-09973-8. ##[5] Y. Jiang, Y. He, H. Gao, Recent progress in porous intermetallics: Synthesis mechanism, pore structure, and material properties, J. Mater. Sci. Technol. 74 (2021) 89–104. https://doi.org/10.1016/j.jmst.2020.10.007. ##[6] Z. Trzaska, G. Bonnefont, G. Fantozzi, J.-P. Monchoux, Comparison of densification kinetics of a TiAl powder by spark plasma sintering and hot pressing, Acta Mater. 135 (2017) 1–13. https://doi.org/10.1016/j.actamat.2017.06.004. ##[7] G.H. Cao, A.M. Russell, C.-G. Oertel, W. Skrotzki, Microstructural evolution of TiAl-based alloys deformed by high-pressure torsion, Acta Mater. 98 (2015) 103–112. https://doi.org/10.1016/j.actamat.2015.07.012. ##[8] C.Y. Teng, N. Zhou, Y. Wang, D.S. Xu, A. Du, et al., Phase-field simulation of twin boundary fractions in fully lamellar TiAl alloys, Acta Mater. 60 (2012) 6372–6381. https://doi.org/10.1016/j.actamat.2012.08.016. ##[9] Y. Garip, Investigation of isothermal oxidation performance of TiAl alloys sintered by different processing methods, Intermetallics. 127 (2020) 106985. https://doi.org/10.1016/j.intermet.2020.106985. ##[10] J. Shen, L. Hu, L. Zhang, W. Liu, A. Fang, Y. Sun, Synthesis of TiAl/Nb composites with concurrently enhanced strength and plasticity by powder metallurgy, Mater. Sci. Eng. A. 795 (2020) 139997. https://doi.org/10.1016/j.msea.2020.139997. ##[11] Z.-Y. Hu, Z.-H. Zhang, X.-W. Cheng, F.-C. Wang, Y.-F. Zhang, S.-L. Li, A review of multi-physical fields induced phenomena and effects in spark plasma sintering: Fundamentals and applications, Mater. Des. 191 (2020) 108662. https://doi.org/10.1016/j.matdes.2020.108662. ##[12] N.F. Mogale, W.R. Matizamhuka, Spark Plasma Sintering of Titanium Aluminides: A Progress Review on Processing, Structure-Property Relations, Alloy Development and Challenges, Metals (Basel). 10 (2020) 1080. https://doi.org/10.3390/met10081080. ##[13] M. Musi, B. Galy, J.-P. Monchoux, A. Couret, H. Clemens, S. Mayer, In-situ observation of the phase evolution during an electromagnetic-assisted sintering experiment of an intermetallic γ-TiAl based alloy, Scr. Mater. 206 (2022) 114233. https://doi.org/10.1016/j.scriptamat.2021.114233. ##[14] D. Wimler, J. Lindemann, T. Kremmer, H. Clemens, S. Mayer, Microstructure and mechanical properties of novel TiAl alloys tailored via phase and precipitate morphology, Intermetallics. 138 (2021) 107316. https://doi.org/10.1016/j.intermet.2021.107316. ##[15] Y. Su, Y. Lin, N. Zhang, D. Zhang, Microstructures and mechanical properties of TiAl alloy fabricated by spark plasma sintering, Int. J. Mod. Phys. B. 34 (2020) 2040036. https://doi.org/10.1142/S0217979220400366. ##[16] E. Hug, G. Dirras, News Trends in Powder Metallurgy: Microstructures, Properties, Durability, Metals. 11 (2021) 1216. https://doi.org/10.3390/met11081216. ##[17] S. Shu, F. Qiu, C. Tong, X. Shan, Q. Jiang, Effects of Fe, Co and Ni elements on the ductility of TiAl alloy, J. Alloys Compd. 617 (2014) 302–305. https://doi.org/10.1016/j.jallcom.2014.07.199. ##[18] X. Gu, F. Cao, N. Liu, G. Zhang, D. Yang, et al., Microstructural evolution and mechanical properties of a high yttrium containing TiAl based alloy densified by spark plasma sintering, J. Alloys Compd. 819 (2020) 153264. https://doi.org/10.1016/j.jallcom.2019.153264. ##[19] P.V. Cobbinah, W. Matizamhuka, R. Machaka, M.B. Shongwe, Y. Yamabe-Mitarai, The effect of Ta additions on the oxidation resistance of SPS-produced TiAl alloys, Int. J. Adv. Manuf. Technol. 106 (2020) 3203–3215. https://doi.org/10.1007/s00170-019-04885-7. ##[20] L. Wang, A.K. Tieu, Q. Zhu, J. Chen, J. Cheng, et al., Achieving the excellent self-lubricity and low wear of TiAl intermetallics through the addition of copper coated graphite, Compos. Part B: Eng. 198 (2020) 108223. https://doi.org/10.1016/j.compositesb.2020.108223. ##[21] S. Shu, B. Xing, F. Qiu, S. Jin, Q. Jiang, Comparative study of the compression properties of TiAl matrix composites reinforced with nano-TiB2 and nano-Ti5Si3 particles, Mater. Sci. Eng. A. 560 (2013) 596–600. https://doi.org/10.1016/j.msea.2012.10.001. ##[22] C.L. Yeh, S.H. Su, In situ formation of TiAl–TiB2 composite by SHS, J. Alloys Compd. 407 (2006) 150–156. https://doi.org/10.1016/j.jallcom.2005.06.053. ##[23] Y. Guo, Y. Liang, J. Lin, F. Yang, Effect of Nano-Y2O3 Addition on Microstructure and Tensile Properties of High-Nb TiAl Alloy Prepared by Spark Plasma Sintering, Metals (Basel). 11 (2021) 1048. https://doi.org/10.3390/met11071048. ##[24] M. Radovic, M.W. Barsoum, MAX phases: bridging the gap between metals and ceramics, Am. Ceram. Soc. Bull. 92 (2013) 20–27. ##[25] X.H. Wang, Y.C. Zhou, Layered Machinable and Electrically Conductive Ti2AlC and Ti3AlC2 Ceramics: a Review, J. Mater. Sci. Technol. 26 (2010) 385–416. https://doi.org/10.1016/S1005-0302(10)60064-3. ##[26] C.L. Yeh, Y.G. Shen, Formation of TiAl–Ti2AlC in situ composites by combustion synthesis, Intermetallics. 17 (2009) 169–173. https://doi.org/10.1016/j.intermet.2008.10.014. ##[27] X.-J. Song, H.-Z. Cui, N. Hou, N. Wei, Y. Han, et al., Lamellar structure and effect of Ti2AlC on properties of prepared in-situ TiAl matrix composites, Ceram. Int. 42 (2016) 13586–13592. https://doi.org/10.1016/j.ceramint.2016.05.152. ##[28] C. Yang, F. Wang, T. Ai, J. Zhu, Microstructure and mechanical properties of in situ TiAl/Ti2AlC composites prepared by reactive hot pressing, Ceram. Int. 40 (2014) 8165–8171. https://doi.org/10.1016/j.ceramint.2014.01.012. ##[29] F. Yang, F.T. Kong, Y.Y. Chen, S.L. Xiao, Effect of spark plasma sintering temperature on the microstructure and mechanical properties of a Ti2AlC/TiAl composite, J. Alloys Compd. 496 (2010) 462–466. https://doi.org/10.1016/j.jallcom.2010.02.077. ##[30] M. Akhlaghi, S.A. Tayebifard, E. Salahi, M. Shahedi Asl, Spark plasma sintering of TiAl–Ti3AlC2 composite, Ceram. Int. 44 (2018) 21759–21764. https://doi.org/10.1016/j.ceramint.2018.08.272. ##[31] M. Akhlaghi, S.A. Tayebifard, E. Salahi, M. Shahedi Asl, G. Schmidt, Self-propagating high-temperature synthesis of Ti3AlC2 MAX phase from mechanically-activated Ti/Al/graphite powder mixture, Ceram. Int. 44 (2018) 9671–9678. https://doi.org/10.1016/j.ceramint.2018.02.195. ##[32] B. Nayebi, M. Shahedi Asl, M. Akhlaghi, Z. Ahmadi, S.A. Tayebifard, et al., Spark plasma sintering of TiB2-based ceramics with Ti3AlC2, Ceram. Int. 47 (2021) 11929–11934. https://doi.org/10.1016/j.ceramint.2021.01.033. ##[33] M. Shahedi Asl, B. Nayebi, M. Akhlaghi, Z. Ahmadi, S.A. Tayebifard, et al., A novel ZrB2-based composite manufactured with Ti3AlC2 additive, Ceram. Int. 47 (2020) 817–827. https://doi.org/10.1016/j.ceramint.2020.08.193. ##[34] F. Sadegh Moghanlou, M. Vajdi, M. Sakkaki, S. Azizi, Effect of graphite die geometry on energy consumption during spark plasma sintering of zirconium diboride, Synth. Sinter. 1 (2021) 54–61. https://doi.org/10.53063/synsint.2021.117. ##[35] S. Jafargholinejad, S. Soleymani, Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering, Synth. Sinter. 1 (2021) 62–68. https://doi.org/10.53063/synsint.2021.1123.