TY - JOUR
T1 - Strength and ductility of gradient structured copper obtained by surface mechanical attrition treatment
AU - Yin, Zhe
AU - Yang, Xincheng
AU - Ma, Xiaolong
AU - Moering, Jordan
AU - Yang, Jian
AU - Gong, Yulan
AU - Zhu, Yuntian
AU - Zhu, Xinkun
PY - 2016/9/5
Y1 - 2016/9/5
N2 - By using surface mechanical attrition treatment (SMAT) at room temperature, a gradient structure (GS) is generated in the surface layer of bulk pure copper samples, which exhibits good uniform elongation and high yield strength simultaneously. Changing SMAT processing time leads to different gradient structures with various component fractions and therefore tune their mechanical properties. The yield strength of the SMAT samples is much higher than the sum of standalone GS layer and coarse-grained (CG) matrix, indicating a synergetic strengthening. Repeated stress relaxation tests were performed to characterize the evolution of mobile dislocations. It was found that the relative mobile dislocation density of SMAT processed sample first drops and then increases with increasing tensile strain. The evolution of mobile dislocations correlates well with strain-hardening evolution. These observations provide insight for the superior combination of high strength and good ductility in SMAT samples.
AB - By using surface mechanical attrition treatment (SMAT) at room temperature, a gradient structure (GS) is generated in the surface layer of bulk pure copper samples, which exhibits good uniform elongation and high yield strength simultaneously. Changing SMAT processing time leads to different gradient structures with various component fractions and therefore tune their mechanical properties. The yield strength of the SMAT samples is much higher than the sum of standalone GS layer and coarse-grained (CG) matrix, indicating a synergetic strengthening. Repeated stress relaxation tests were performed to characterize the evolution of mobile dislocations. It was found that the relative mobile dislocation density of SMAT processed sample first drops and then increases with increasing tensile strain. The evolution of mobile dislocations correlates well with strain-hardening evolution. These observations provide insight for the superior combination of high strength and good ductility in SMAT samples.
KW - Gradient structure
KW - Mechanical properties
KW - Mobile dislocation density
KW - Pure copper
KW - Surface mechanical attrition treatment
KW - Synergetic strengthening
KW - Gradient structure
KW - Mechanical properties
KW - Mobile dislocation density
KW - Pure copper
KW - Surface mechanical attrition treatment
KW - Synergetic strengthening
KW - Gradient structure
KW - Mechanical properties
KW - Mobile dislocation density
KW - Pure copper
KW - Surface mechanical attrition treatment
KW - Synergetic strengthening
UR - http://www.scopus.com/inward/record.url?scp=84969697662&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84969697662&origin=recordpage
U2 - 10.1016/j.matdes.2016.05.015
DO - 10.1016/j.matdes.2016.05.015
M3 - RGC 21 - Publication in refereed journal
SN - 0264-1275
VL - 105
SP - 89
EP - 95
JO - Materials and Design
JF - Materials and Design
ER -