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Microstructure and mechanical properties of commercial purity titanium severely deformed by ARB process

  • Nano May 2006
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Abstract

Commercial purity titanium was deformed by accumulative roll-bonding (ARB) process up to 8 cycles (equivalent strain of 6.4) at ambient temperature. This is the first study on ultra-high straining of h.c.p. metals by the ARB process. The microstructure of the ARB-processed specimens showed two kinds of characteristic ultrafine microstructures. One was the lamellar boundary structure elongated along RD, which has been also reported in the ARB-processed cubic metals. The lamellar boundary spacing decreased with increasing ARB strain and reached about 80 nm after 5 ARB cycles. The other microstructure was the equiaxed grains having mean grain size of 80–100 nm. Such a fine and equiaxed grain structure has not yet been reported in the as-ARB-processed materials before. The fraction of the equiaxed grains increased as the ARB process proceeded, and 90% of the specimen was filled with the equiaxed grains after 8 ARB cycles. As the number of the ARB process increased, the tensile strength increased and the total elongation decreased gradually. After 6 ARB cycles, the specimen exhibited almost the same mechanical properties as that of commercial Ti-6Al-4V alloy.

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Acknowledgements

The present research was financially supported by the twenty-first century COE program, the Center of Excellence for Advanced Structural and Functional Materials Design at Osaka University through the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the Grant-in-Aid for Scientific Research (C), project No.17560632 in 2005.

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Authors and Affiliations

  1. Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Osaka, Japan

    Daisuke Terada, Seiya Inoue & Nobuhiro Tsuji

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  1. Daisuke Terada
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  2. Seiya Inoue
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  3. Nobuhiro Tsuji
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Correspondence to Daisuke Terada.

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Terada, D., Inoue, S. & Tsuji, N. Microstructure and mechanical properties of commercial purity titanium severely deformed by ARB process. J Mater Sci 42, 1673–1681 (2007). https://doi.org/10.1007/s10853-006-0909-7

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  • DOI: https://doi.org/10.1007/s10853-006-0909-7

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