TY - JOUR
T1 - Effect of stacking fault energy on deformation mechanisms in Cu and Cu-30% Zn alloy with gradient structure obtained by SMAT
AU - Liu, Xiaomin
AU - Nakatani, Masashi
AU - Gao, Hongliang
AU - Sharma, Bhupendra
AU - Pan, Hongjiang
AU - Fu, Zhengrong
AU - Li, Xingfu
AU - Ameyama, Kei
AU - Zhu, Xinkun
N1 - Funding Information:
The authors wish to thank Prof. Yuntian Zhu for his insightful and constructive comments and suggestions. The authors would like to acknowledge financial support by the National Natural Science Foundation of China (NSFC) under Grants No. 51664033 , No. 51911540072 , No. 51861015 , and 2019 Japan Society for the Promotion of Science JSPS/NSFC Bilateral Joint Research Project . The authors were supported Basic Research of Foundation of Yunnan Province for Young Scientists (Grant No. 202001AU070081 ). This work was also supported by JSPS Grants-in-Aid for Scientific Research (KAKENHI) Grants No. 20K15064 and No. JP18H05256 .
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/6/5
Y1 - 2021/6/5
N2 - The deformation mechanism and mechanical properties of pure copper and copper-zinc alloys with low stacking fault energy (SFE) were investigated primarily. In this paper, pure Cu and Cu-30%Zn samples were processed by surface mechanical attrition treatment (SMAT) at cryogenic temperature. The results show that Cu-30%Zn samples exhibit higher yield strength and better ductility by tensile tests at room temperature. With the same processing time of SMAT, the SMAT-ed Cu-30%Zn samples exhibit an optimized combination of strength and ductility compared with that of the SMAT-ed Cu samples. The in-situ electron backscatter diffraction (EBSD) tests show that there is a high density of geometrically necessary dislocations (GNDs) in SMAT-ed Cu-30%Zn samples with low SFE, thereby forming a strong hetero-deformation induced (HDI) stress strengthening and HDI hardening. Also, the twins promote the accumulation of geometrically necessary dislocations to enhance strength while maintaining good ductility in the Cu − 30%Zn samples.
AB - The deformation mechanism and mechanical properties of pure copper and copper-zinc alloys with low stacking fault energy (SFE) were investigated primarily. In this paper, pure Cu and Cu-30%Zn samples were processed by surface mechanical attrition treatment (SMAT) at cryogenic temperature. The results show that Cu-30%Zn samples exhibit higher yield strength and better ductility by tensile tests at room temperature. With the same processing time of SMAT, the SMAT-ed Cu-30%Zn samples exhibit an optimized combination of strength and ductility compared with that of the SMAT-ed Cu samples. The in-situ electron backscatter diffraction (EBSD) tests show that there is a high density of geometrically necessary dislocations (GNDs) in SMAT-ed Cu-30%Zn samples with low SFE, thereby forming a strong hetero-deformation induced (HDI) stress strengthening and HDI hardening. Also, the twins promote the accumulation of geometrically necessary dislocations to enhance strength while maintaining good ductility in the Cu − 30%Zn samples.
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U2 - 10.1016/j.jallcom.2021.158863
DO - 10.1016/j.jallcom.2021.158863
M3 - Article
AN - SCOPUS:85100039819
SN - 0925-8388
VL - 865
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 158863
ER -