Production of nanograined intermetallics using high-pressure torsion

Ali Alhamidi, Kaveh Edalati, Zenji Horita

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Formation of intermetallics is generally feasible at high temperatures when the lattice diffusion is fast enough to form the ordered phases. This study shows that nanograined intermetallics are formed at a low temperature as 573 K in Al- 25 mol% Ni, Al- 50 mol.% Ni and Al- 50 mol% Ti powder mixtures through powder consolidation using high-pressure torsion (HPT). For the three compositions, the hardness gradually increases with straining but saturates to the levels as high as 550-920 Hv. In addition to the high hardness, the TiAl material exhibits high yield strength as ~3 GPa with good ductility as ~23%, when they are examined by micropillar compression tests. X-ray diffraction analysis and high-resolution transmission electron microscopy reveal that the significant increase in hardness and strength is due to the formation of nanograined intermetallics such as Al3Ni, Al3Ni 2, TiAl3, TiAl2 and TiAl with average grain sizes of 20-40 nm.

Original languageEnglish
Pages (from-to)672-678
Number of pages7
JournalMaterials Research
Volume16
Issue number3
DOIs
Publication statusPublished - May 1 2013

Fingerprint

Torsional stress
Intermetallics
torsion
intermetallics
hardness
Hardness
Powders
compression tests
consolidation
yield strength
High resolution transmission electron microscopy
ductility
Consolidation
X ray diffraction analysis
Yield stress
Ductility
grain size
Temperature
transmission electron microscopy
high resolution

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Production of nanograined intermetallics using high-pressure torsion. / Alhamidi, Ali; Edalati, Kaveh; Horita, Zenji.

In: Materials Research, Vol. 16, No. 3, 01.05.2013, p. 672-678.

Research output: Contribution to journalArticle

Alhamidi, Ali ; Edalati, Kaveh ; Horita, Zenji. / Production of nanograined intermetallics using high-pressure torsion. In: Materials Research. 2013 ; Vol. 16, No. 3. pp. 672-678.
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