Effect of stacking fault energy on deformation mechanisms in Cu and Cu-30% Zn alloy with gradient structure obtained by SMAT

Xiaomin Liu, Masashi Nakatani, Hongliang Gao, Bhupendra Sharma, Hongjiang Pan, Zhengrong Fu, Xingfu Li, Kei Ameyama, Xinkun Zhu

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2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number158863
JournalJournal of Alloys and Compounds
Volume865
DOIs
Publication statusPublished - Jun 5 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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