Abstract
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 stress σR (ɛR), 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 of σR in bicrystals with a tilt boundary of 9°, θ9 bicrystals, is almost equal to that in single crystals, but is larger than σR in θ23, θ36 and θ43 bicrystals. These results indicate that the θ9 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. The θ-dependence of σR or ɛR is discussed in connection with the stress concentration near the grain boundary.
| Original language | English |
|---|---|
| Pages (from-to) | 3420-3424 |
| Number of pages | 5 |
| Journal | Journal of Materials Science |
| Volume | 21 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Jan 1 1986 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Cite this
Effect of grain boundaries on dynamic recrystallization behaviour of copper isoaxial bicrystals with 〈001〉 tilt boundaries. / Takada, Jun; Nishino, Naohisa; Kikuchi, Shiomi.
In: Journal of Materials Science, Vol. 21, No. 10, 01.01.1986, p. 3420-3424.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Effect of grain boundaries on dynamic recrystallization behaviour of copper isoaxial bicrystals with 〈001〉 tilt boundaries
AU - Takada, Jun
AU - Nishino, Naohisa
AU - Kikuchi, Shiomi
PY - 1986/1/1
Y1 - 1986/1/1
N2 - 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 stress σR (ɛR), 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 of σR in bicrystals with a tilt boundary of 9°, θ9 bicrystals, is almost equal to that in single crystals, but is larger than σR in θ23, θ36 and θ43 bicrystals. These results indicate that the θ9 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. The θ-dependence of σR or ɛR is discussed in connection with the stress concentration near the grain boundary.
AB - 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 stress σR (ɛR), 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 of σR in bicrystals with a tilt boundary of 9°, θ9 bicrystals, is almost equal to that in single crystals, but is larger than σR in θ23, θ36 and θ43 bicrystals. These results indicate that the θ9 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. The θ-dependence of σR or ɛR is discussed in connection with the stress concentration near the grain boundary.
UR - http://www.scopus.com/inward/record.url?scp=85047693513&partnerID=8YFLogxK
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U2 - 10.1007/BF02402981
DO - 10.1007/BF02402981
M3 - Article
AN - SCOPUS:85047693513
VL - 21
SP - 3420
EP - 3424
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 10
ER -