Microstructure and yield strength of ultrafine grained aluminum processed by hot isostatic pressing

J. Gubicza, G. Dirras, P. Szommer, B. Bacroix

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The correlation between the microstructure and the yield strength of a specimen produced by hot isostatic pressing (HIP) of commercial purity aluminum nano-powder was studied. It was found that the bulk sample can be regarded as a composite containing microcrystalline grains embedded in an ultrafine grained matrix. The composite-like microstructure results in a bimodal hardness distribution as shown by nanoindentation. The yield strength values for both the ufg matrix and the mc grains were calculated from the characteristic parameters of the microstructure. The yield strength of the composite estimated by using a simple rule of mixture was in good agreement with the value determined by compression test. It was revealed that the majority of the strengthening can be attributed to the dislocations in the ufg matrix and the alumina dispersoids formed during HIP process.

Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalMaterials Science and Engineering A
Volume458
Issue number1-2
DOIs
Publication statusPublished - Jun 15 2007

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hot isostatic pressing
Hot isostatic pressing
yield strength
Aluminum
Yield stress
aluminum
microstructure
Microstructure
composite materials
Composite materials
matrices
Aluminum Oxide
compression tests
Nanoindentation
nanoindentation
Powders
purity
Alumina
hardness
aluminum oxides

Keywords

  • Hot isostatic pressing (HIP)
  • Nanoindentation
  • Ultrafine grained microstructure
  • X-ray line profile analysis
  • Yield strength

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Microstructure and yield strength of ultrafine grained aluminum processed by hot isostatic pressing. / Gubicza, J.; Dirras, G.; Szommer, P.; Bacroix, B.

In: Materials Science and Engineering A, Vol. 458, No. 1-2, 15.06.2007, p. 385-390.

Research output: Contribution to journalArticle

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