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Keynote Lecture

Incremental Feedings with High-Pressure Torsion (IF-HPT) and High-Pressure Sliding (IF-HPS) for Upsizing Sample Dimensions

Wednesday (26.09.2018)
16:30 - 17:00 S1/01 - A1
Part of:


High-pressure torsion (HPT) [1] and high-pressure sliding (HPS) [2] are typical SPD processes under high pressure for significant grain refinement even in hard-to-deform materials [3,4]. Whereas the HPT process uses a disk or ring shape of samples, the HPS process a sheet or rod shape of samples. For both processes, it is important to up-scale the sample size for practical application. This presentation shows our recent development that the incorporation of incremental feeding in both processes leads to an increase in the SPD-processed area without increasing the machine capacity [5-8]. These SPD processes, called the incremental feeding HPT (IF-HPT) and the incremental feeding HPS (IF-HPS), were applied to a Ni-based superalloy (Inconel 718) [5-8], a Ti-6Al-7Nb alloy (F1295) [5], and a high strength aluminum alloy (A2024) [8]. It was successful to increase the SPD-processed areas as large as 100x100 mm2 of Inconel 718 alloy using the IF-HPS process [6] and as 60mm diameter disk of A2024 alloy using the IF-HPT process [7]. It is shown that ultrafine grains of the order of ~100 nm were obtained and superplasticity with elongations more than 400% was achieved.


References:

[1] P. W. Bridgman: Phys. Rev. 48 (1935) 825-847.

[2] T. Fujioka and Z. Horita: Mater. Trans. 50 (2009) 930-933.

[3] R.Z. Valiev, Y. Estrin, Z. Horita, T.G. Langdon, M.J. Zehetbauer and Y.T. Zhu: JOM 68 (2016) 1216-1226.

[4] R.Z. Valiev, Y. Estrin, Z. Horita, T.G. Langdon, M.J. Zehetbauer and Y.T. Zhu: Mater.Res. Lett. 4 (2016) 1-21.

[5] Y. Takizawa, K.Watanabe, T. Kajita, K. Sumikawa, T. Masuda, M. Yumoto, Y. Otagiri and Z. Horita: J. Japan Inst. Met. Mater. 82 (2018) 25-31.

[6] Y. Takizawa, K. Sumikawa, T. Masuda, M. Yumoto, Y. Otagiri and Z. Horita: Metall. Mater. Trans. A, (2018) in press.

[7] E. Shigeno, T. Komatsu, K. Sumikawa, T. Masuda, Y. Takizawa, M. Yumoto, Y. Otagiri and Z. Horita: Mater. Trans. (2018) submitted.

[8] T. Komatsu, E. Shigeno, K. Sumikawa, T. Masuda, Y. Takizawa, M. Yumoto, Y. Otagiri and Z. Horita: Mater. Trans. (2018) to be submitted.

 

Speaker:
Prof. Zenji Horita
Kyushu University