Flow processes at low temperatures in ultrafine-grained aluminum

N. Chinh, Péter Szommer, Tamás Csanádi, Terence G. Langdon

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Experiments were conducted to evaluate the flow behavior of pure aluminum at low temperatures. Samples were processed by equal-channel angular pressing (ECAP) to give a grain size of ∼1.2 μm and compression samples were cut from the as-pressed billets and tested over a range of strain rates at temperatures up to 473 K. The results show the occurrence of steady-state flow in these highly deformed samples and a detailed analysis gives a low strain rate sensitivity and an activation energy similar to the value for grain boundary diffusion. By using depth-sensing indentation testing and atomic force microscopy, it is shown that grain boundary sliding occurs in this material at low temperatures. This result is attributed to the presence of high-energy non-equilibrium boundaries in the severely deformed samples.

Original languageEnglish
Pages (from-to)326-334
Number of pages9
JournalMaterials Science and Engineering A
Volume434
Issue number1-2
DOIs
Publication statusPublished - Oct 25 2006

Fingerprint

Aluminum
aluminum
Strain rate
strain rate
Equal channel angular pressing
Grain boundary sliding
grain boundaries
Indentation
equilibrium flow
Temperature
billets
Atomic force microscopy
Grain boundaries
pressing
Activation energy
indentation
sliding
grain size
Testing
atomic force microscopy

Keywords

  • Equal-channel angular pressing (ECAP)
  • Grain boundary sliding
  • Non-equilibrium boundaries
  • Plastic deformation
  • Ultrafine grains

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Flow processes at low temperatures in ultrafine-grained aluminum. / Chinh, N.; Szommer, Péter; Csanádi, Tamás; Langdon, Terence G.

In: Materials Science and Engineering A, Vol. 434, No. 1-2, 25.10.2006, p. 326-334.

Research output: Contribution to journalArticle

Chinh, N. ; Szommer, Péter ; Csanádi, Tamás ; Langdon, Terence G. / Flow processes at low temperatures in ultrafine-grained aluminum. In: Materials Science and Engineering A. 2006 ; Vol. 434, No. 1-2. pp. 326-334.
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