TY - JOUR
T1 - Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing
AU - Alawadhi, Meshal Y.
AU - Sabbaghianrad, Shima
AU - Wang, Ying Chun
AU - Huang, Yi
AU - Langdon, Terence G.
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/2/21
Y1 - 2020/2/21
N2 - Oxygen-free copper was processed by equal-channel angular pressing (ECAP) at room temperature for 1, 4 and 8 passes and then the ECAP specimens were further deformed by dynamic testing at 298 K using a strain rate of 10 s−1. Experiments were conducted to investigate the influence of the initial microstructures induced by ECAP on the subsequent grain refinement and mechanical properties after dynamic testing. The results show the strength of copper increased with increasing numbers of ECAP passes and a significant additional grain refinement was produced in the ECAP specimens through the dynamic testing. Thus, the initial grain sizes after ECAP for 1, 4 and 8 passes were ~16, ~4.4 and ~2.9 μm, respectively, and these values were reduced to ~400, ~330 and ~300 nm by dynamic testing, The grains were refined by conventional dislocation processes in the 1-pass specimen but there was evidence for dynamic recrystallization in the specimen processed by 8 passes.
AB - Oxygen-free copper was processed by equal-channel angular pressing (ECAP) at room temperature for 1, 4 and 8 passes and then the ECAP specimens were further deformed by dynamic testing at 298 K using a strain rate of 10 s−1. Experiments were conducted to investigate the influence of the initial microstructures induced by ECAP on the subsequent grain refinement and mechanical properties after dynamic testing. The results show the strength of copper increased with increasing numbers of ECAP passes and a significant additional grain refinement was produced in the ECAP specimens through the dynamic testing. Thus, the initial grain sizes after ECAP for 1, 4 and 8 passes were ~16, ~4.4 and ~2.9 μm, respectively, and these values were reduced to ~400, ~330 and ~300 nm by dynamic testing, The grains were refined by conventional dislocation processes in the 1-pass specimen but there was evidence for dynamic recrystallization in the specimen processed by 8 passes.
KW - Copper
KW - Dynamic testing
KW - Equal-channel angular pressing
KW - High strain rates
KW - Severe plastic deformation
UR - http://www.scopus.com/inward/record.url?scp=85078164678&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2020.138985
DO - 10.1016/j.msea.2020.138985
M3 - Article
AN - SCOPUS:85078164678
SN - 0921-5093
VL - 775
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 138985
ER -