TY - JOUR
T1 - Experimental study on pure copper subjected to different severe plastic deformation modes
AU - Li, Jinghui
AU - Li, Fuguo
AU - Zhao, Chen
AU - Chen, Han
AU - Ma, Xinkai
AU - Li, Jiang
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/2/22
Y1 - 2016/2/22
N2 - Equal channel angular pressing (ECAP), elliptical cross-section spiral equal-channel extrusion (ECSEE) and torsion deformation (TD) have been proven as efficient SPD methods for grain refinement. In order to compare the characteristics of grain refinement by these technologies, experimental researches on microstructure evolution and mechanical properties have been conducted by optical microscopy (OM), transmission electronic microscopy (TEM) and microhardness tests. OM observation shows a significant decrease and non-uniformed distribution in grain size on the cross-section of the processed samples, which agrees well with the result of strain distribution. TEM observation shows a similar refinement process undergoing the forming of shear bands, dislocation forest, large-angle grain boundaries and sub-grains. The different morphological structures by TEM have been discussed in terms of the effect of deformation modes including bending-torsion, extrusion torsion and pure torsion on microstructure evolution. Microhardness distribution of pure copper after 6-passes deformation agrees well with the microstructure observed by OM. However, ECAP is different with ECSEE and TD in microhardness distribution along the radial and circumferential directions.
AB - Equal channel angular pressing (ECAP), elliptical cross-section spiral equal-channel extrusion (ECSEE) and torsion deformation (TD) have been proven as efficient SPD methods for grain refinement. In order to compare the characteristics of grain refinement by these technologies, experimental researches on microstructure evolution and mechanical properties have been conducted by optical microscopy (OM), transmission electronic microscopy (TEM) and microhardness tests. OM observation shows a significant decrease and non-uniformed distribution in grain size on the cross-section of the processed samples, which agrees well with the result of strain distribution. TEM observation shows a similar refinement process undergoing the forming of shear bands, dislocation forest, large-angle grain boundaries and sub-grains. The different morphological structures by TEM have been discussed in terms of the effect of deformation modes including bending-torsion, extrusion torsion and pure torsion on microstructure evolution. Microhardness distribution of pure copper after 6-passes deformation agrees well with the microstructure observed by OM. However, ECAP is different with ECSEE and TD in microhardness distribution along the radial and circumferential directions.
KW - Deformation mode
KW - Grain refinement
KW - Microhardness distribution
KW - Pure copper
KW - Severe plastic deformation
UR - http://www.scopus.com/inward/record.url?scp=84954443886&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2016.01.018
DO - 10.1016/j.msea.2016.01.018
M3 - 文章
AN - SCOPUS:84954443886
SN - 0921-5093
VL - 656
SP - 142
EP - 150
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -