Detail publikace

Fatigue behavior and damage characteristic of ultra-fine grain low-purity copper processed by equal-channel angular pressing (ECAP)

XU, C. WANG, Q. ZHENG, M. LI, J. HUANG, M. JIA, Q. ZHU, J. KUNZ, L. BUKSA, M.

Originální název

Fatigue behavior and damage characteristic of ultra-fine grain low-purity copper processed by equal-channel angular pressing (ECAP)

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

The S-N and Coffin-Manson plot, cyclic stress-strain response, changes of microstructure, and the surface morphology of ultra-fine grain (UFG) low-purity copper processed by ECAP were tested and observed in present study. And the formation mechanism of shear bands was discussed in detail. The results show that the UFG Cu represents longer lifetime under stress-controlled fatigue, but lower fatigue resistance under straincontrolled fatigue when compared with the coarse grain counterpart. Cyclic stress-strain responses of UFG Cu under stress-controlled fatigue alter from cyclic softening to cyclic hardening as stress amplitude decreases. But the responses always show cyclic softening under strain-controlled fatigue in present testing. By electron back scattering diffraction and transmission electron microscope technique, the shear bands were discovered on the surface of all cycled samples and no grain coarsening was discovered near the shear bands, which indicated that there was no inevitable relationship between formation of SBs and cyclic softening/grain coarsening. The discovery should be related to impurities in copper. The oriented distribution of defects along the shear plane in the last ECAP processing is one of the major mechanisms of SBs formation.

Klíčová slova

Copper; Ultra-fine grain structure; ECAP; Fatigue behavior; Shear bands

Autoři

XU, C.; WANG, Q.; ZHENG, M.; LI, J.; HUANG, M.; JIA, Q.; ZHU, J.; KUNZ, L.; BUKSA, M.

Rok RIV

2008

Vydáno

17. 4. 2007

Nakladatel

Elsevier

ISSN

0921-5093

Periodikum

Materials Science and Engineering A

Ročník

2008

Číslo

475

Stát

Švýcarská konfederace

Strany od

249

Strany do

256

Strany počet

8

BibTex

@article{BUT44571,
  author="Lanhong {Xu} and Qingjuan {Wang} and Maosheng {Zheng} and Jindou {Li} and Meiquan {Huang} and Qingming {Jia} and Jiewu {Zhu} and Ludvík {Kunz} and Michal {Buksa}",
  title="Fatigue behavior and damage characteristic of ultra-fine grain low-purity copper processed by equal-channel angular pressing (ECAP)",
  journal="Materials Science and Engineering A",
  year="2007",
  volume="2008",
  number="475",
  pages="249--256",
  issn="0921-5093"
}