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- Title
Microstructure and mechanical properties of commercial purity titanium severely deformed by ARB process.
- Authors
Terada, Daisuke; Inoue, Seiya; Tsuji, Nobuhiro
- 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.
- Subjects
TITANIUM; DEFORMATIONS (Mechanics); STRAINS &; stresses (Mechanics); MICROSTRUCTURE; MECHANICAL properties of metals
- Publication
Journal of Materials Science, 2007, Vol 42, Issue 5, p1673
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-0909-7