caa a22 4500 467944318 CHVBK 20180322200724.0 cr unu---uuuuu 170328e19861001xx s 000 0 eng 10.1007/BF00553779 doi (NATIONALLICENCE)springer-10.1007/BF00553779 (NATIONALLICENCE)springer-10.1007/BF02402981 Effect of grain boundaries on dynamic recrystallization behaviour of copper isoaxial bicrystals with 〈001〉 tilt boundaries [Elektronische Daten] [Jun Takada, Naohisa Nishino, Shiomi Kikuchi] Dynamic recrystallization behaviour of copper isoaxial bicrystals with various 〈001〉 tilt boundaries was investigated at 1023 and 1073 K at an initial strain rate of 3.33×10−4sec−1, with special attention paid to the effect of grain boundaries on the recrystallization stress (strain) and the substructure developed during deformation. The grain boundaries in the bicrystals have almost no effect on the stress-strain curves. Flow stress was found to fall abruptly and significantly during deformation, being similar to the flow stress in the single crystals. The stressσ R (ɛ R), just before the stress fall indicates the stress (strain) at which dynamic recrystallization occurs. The growth of recrystallized grains is markedly fast in these bicrystals, suggesting that dynamic recrystallization is controlled by a nucleation process. The value ofσ R in bicrystals with a tilt boundary of 9°,θ9 bicrystals, is almost equal to that in single crystals, but is larger thanσ R inθ23,θ36 andθ43 bicrystals. These results indicate that theθ9 boundary has no effect on the dynamic recrystallization of bicrystals, whereas grain boundaries with tilt angles above 23° accelerate the dynamic recrystallization of these bicrystals. Theθ-dependence ofσ R orɛ R is discussed in connection with the stress concentration near the grain boundary. Chapman and Hall Ltd, 1986 Takada Jun Department of Metal Science and Technology, Kyoto University, Sakyo-ku, 606, Kyoto, Japan aut Nishino Naohisa Department of Metal Science and Technology, Kyoto University, Sakyo-ku, 606, Kyoto, Japan aut Kikuchi Shiomi Department of Metal Science and Technology, Kyoto University, Sakyo-ku, 606, Kyoto, Japan aut Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3420-3424 0022-2461 21:10<3420 1986 21 10853 https://doi.org/10.1007/BF00553779 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00553779 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Takada Jun Department of Metal Science and Technology, Kyoto University, Sakyo-ku, 606, Kyoto, Japan aut NATIONALLICENCE 700 1- Nishino Naohisa Department of Metal Science and Technology, Kyoto University, Sakyo-ku, 606, Kyoto, Japan aut NATIONALLICENCE 700 1- Kikuchi Shiomi Department of Metal Science and Technology, Kyoto University, Sakyo-ku, 606, Kyoto, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers 21/10(1986-10-01), 3420-3424 0022-2461 21:10<3420 1986 21 10853 NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02402981 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer