Authors: Seong Hee Lee, Sang Shik Kim, S.Z. Han, Cha Yong Lim
Abstract: The effects of strain rate in rolling on microstructures and mechanical properties of a
nano-grained high purity copper processed by accumulative roll bonding (ARB) were studied. The
rolling during ARB was conducted with two kinds of strain rates (2.6sec-1 and 37sec-1). The
microstructural evolution of the copper with ARB proceeding was somewhat different in both
methods. However, the variation of mechanical properties with ARB was very similar to each other.
71
Authors: Hyoung Wook Kim, Cha Yong Lim, Suk Bong Kang
Abstract: Al-Mg alloy sheets with high Mg contents (3~10wt%Mg) were fabricated by twin roll strip
casting. The optimum process conditions to get a good surface quality of Al-Mg strip have been
suggested in this experiment. Controlling the cooling rate of cast roll was important to improve the
surface quality of the strip and a compositional homogeneity through the thickness. The size of
intermetallic particle like Al-Fe compound was reduced down to 1~2μm due to a high cooling rate of
Al melt during strip casting. In addition, the dendrite structure was fine and the segregation of Al8Mg5
phase between grains was remarkably reduced. Therefore, the strips with a thickness of 3mm have
good workability during additional hot/warm rolling processes. The hot/warm rolled Al-5wt%Mg
sheets show high strength and elongation. When the rolled sheets were annealed at 300 oC for 1hr., the
tensile strength and total elongation of the sheets reached at 290 MPa and 30%, respectively.
83
Authors: Masahiro Goto, S.Z. Han, Sang Shik Kim, Norio Kawagoishi, Cha Yong Lim
Abstract: Oxygen-free copper was processed by equal channel angular pressing with different
numbers of ECAP process cycles, NP. Tensile strength was increased with an increase in NP, but it
tended to saturate after NP = 4. Conversely, elongation was dramatically decreased by first pressing,
but it tended to saturate up to NP = 3, followed by slight increasing trend after NP = 4. Fatigue tests of
specimens processed with NP = 4 and 8 were performed. The change in surface morphologies during
fatigue was monitored successively. In addition to this, the change in surface hardness was measured.
Significant decrease in surface hardness due to cyclic stresses was measured. The physical basis of
fatigue damage of UFG copper was discussed based on the experimental results.
1649
Authors: Seong Hee Lee, S.Z. Han, Cha Yong Lim
Abstract: The difference in annealing characteristics of oxygen free copper (OFC) and
deoxidized low-phosphorous copper (DLP) processed by ARB was studied. The copper alloys
processed by eight cycles of the ARB were annealed for 10 minutes at various temperatures
ranging from 100 to 400°C. The variation of microstructure and mechanical properties with
annealing was significantly different in both copper alloys. In case of OFC, the ultrafine grained
(UFG) structure formed by the ARB still remained up to 200°C, and above 200°C it was
completely replaced with a coarse grained structure due to an occurrence of the conventional
recrystallization. However, in case of DLP, the recrystallization did not occur even at 350°C.
The strength of the OFC also decreased significantly at annealing temperatures above 200°C,
while the hardness of the DLP did not decrease so largely up to 350°C. These differences in
annealing characteristics in both copper alloys were discussed in terms of purity.
1373
Authors: Tae Hyun Nam, Hyun Gon Kim, Ju Young Choi, Jung Moo Lee, Suk Bong Kang, Cha Yong Lim
Abstract: Deformation behavior of temperature gradient anneal(TGA) treated Ti-50.0Ni(at%)
alloys were investigated by means of thermal cycling tests under constant load and tensile tests.
TGA treated Ti-Ni alloy wires showed a sequential deformation behavior along the length of the
specimen since the stress required for the B2-B19’ transformation increased with decreasing
annealing temperature. Considerably large residual elongation(about 0.4 %) occurred in the TGA
treated Ti-Ni alloy under the applied stress of 80 MPa, which is ascribed to the fact that yield stress
of the sample annealed at 823 K is lower than the stress required for the B2-B19’ transformation of
the sample annealed at 658 K.
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Authors: Cha Yong Lim, S.Z. Han, Seong Hee Lee
Abstract: The accumulative roll bonding (ARB) process is one of the methods to refine the grain
size of metallic materials. The ARB process up to 8 cycles was performed for the pure Cu and Cu-
Fe-P (PMC-90) alloy at ambient temperature under no lubricant conditions. In the pure Cu, the
nano-sized grains were formed after third cycle with an average grain size of 200nm. Once the 200
nm grains formed, further reduction in the grain size was not observed up to the 8 ARB process
cycles. On the other hand, the formation of the stable nano-sized grains in PMC-90 alloy was
retarded compared to the pure Cu due to the alloying elements. For both alloys, the tensile strength
values increased drastically in the initial stage of ARB process. The tensile strength values of both
alloys tended to saturate after the third ARB process cycle. The tensile elongation value greatly
decreased by 1 cycle of ARB process due to the strain hardening. After the third cycle of ARB
process, each alloy showed a gradual increase in tensile elongation due to the dynamic recovery.
For PMC-90 alloy, the strength value is higher than that of OFC due to addition of the alloying
elements.
2849
Authors: Seong Hee Lee, S.Z. Han, Cha Yong Lim
Abstract: Accumulative roll-bonding (ARB) process was applied to an oxygen free copper for
improvement of the mechanical properties via ultra grain refinement to nanometer order level.
Two copper sheets 1mm thick, 30mm wide and 300mm long are degreased and wire-brushed for
sound bonding. The sheets are then stacked to each other, and cold-roll-bonded by 50%
reduction rolling. The sheet is then cut to the two pieces of same length and the same procedure
was repeated to the sheets. The ARB process up to eight cycles (an equivalent thickness strain of
6.4) is successfully performed at ambient temperature. TEM observation reveals that ultrafine
grains, hardly containing the dislocation interior, begin to develop at the third cycle, and after
the sixth cycle they cover most of regions of samples. The morphology of ultrafine grains
formed is different from that of aluminum alloys. Tensile strength of the ARB-processed copper
increases with the equivalent strain up to a strain of ~3.2, in which it reached 390 MPa, ~2.1
times higher than the initial value. However, the strength hardly changed at the strain above ~3.2.
239
Authors: S.Z. Han, Cha Yong Lim, Chang Joo Kim, Sang Shik Kim
Abstract: The mechanical behavior of nano grain-sized pure copper produced by various SPD (severe plastic deformation) processes such as ECAP (equal channel angular pressing) and ARB (accumulated roll bonding) was investigated in relation to the microstructural evolution. These processes promoted the formation of equiaxed nanoscale grains in pure copper. The present observation suggested that the tensile behavior of the specimens prepared by the current SPD processes was influenced by several mechanisms involving strain hardening and dynamic recovery.
The heat flow was measured by using a DSC (differential scanning calorimeter) to elucidate the relationship between the dislocation density and the tensile behavior in the specimens.
3497
Authors: Cha Yong Lim, Jae Hyuck Jung, S.Z. Han
Abstract: The equal channel angular pressing (ECAP) is one of the methods to refine the grain size of metallic materials. This study investigates the effect of ECAP process on the formation of the fine grain size in oxygen free Cu and Cu alloys. The average grain size has been refined from 150 µm before ECAP to 300 nm. Microstructure was analyzed by transmission electron micrography (TEM). The diffraction pattern of the selected area confirmed the formation of ultrafine-grained structure with
high angle grain boundaries after 8 cycles of ECAP. Mechanical properties such as microhardness and tensile properties of the ultra-fine grained copper materials have been investigated.
177
Authors: Seong Hee Lee, Chung Hyo Lee, Cha Yong Lim
Abstract: Two and six-layer stack accumulative roll bonding (ARB) processes were applied to commercial purity aluminum in order to investigate the effect of the stacking layer number on the mechanical properties. The initial thickness of the aluminum sheets for two and six-layer stack ARB was 1mm and 0.5mm, respectively. Two-layer stack ARB was performed by 50% reduction per cycle. For six-layer stack ARB, the six aluminum sheets were first stacked together and cold-roll-bonded by 50% reduction rolling, and then followed by four-pass rolling so that the final thickness was 0.5mm. The sheet was then cut to the six pieces of same length and the same procedure was repeated to the sheets. The tensile strength of the ARB processed specimens increases with the number of ARB cycles in both two and six layer stack ARB. The
tensile strength is lower by the six-layer stack ARB than that by the two-layer stack ARB. The elongation slightly decreases with the number of the ARB cycles, regardless of the stacking layer number. TEM observation reveals that the grain size of the six-layer stack ARB is larger than that of the two-layer stack ARB. The effects of the number of the layers in stacking are explained by the redundant shear deformation.
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