Bulk Al materials from back pressure equal channel angular consolidation of mechanically milled particles

Masahiro Kubota*, Xiaolin Wu, Wei Xu, Kenong Xia

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

3 Citations (Scopus)

Abstract

Mechanically milled pure aluminium powders were fabricated into bulk materials using back pressure equal channel angular consolidation (BP-ECAC) for four or eight passes at 373K. The bulk materials consolidated from 0 h and 4 h mechanically milled powders were characterised by Vickers hardness tests and density measurements. Thermal stability of the consolidated bulk materials was evaluated by isothermal heat treatments at 673K. The as-consolidated bulk material from the 0 h milled (i.e. unmilled) powder showed nearly full density. However, full density was not obtained with the 4 h milled powder even after eight passes. The HV values for the as-consolidated materials fabricated from the 0 h and 4 h milled powders after four passes and from the 4 h milled powder after eight passes were 57, 121 and 136, respectively. Softening was observed in the bulk material consolidated from the 0 h milled powder during the isothermal heat treatment. However, the hardness of the bulk materials consolidated from the 4 h milled powders after four and eight passes increased to maximum values of 137 and 141 after heat treatment for 28 h and 8 h at 673K, respectively. The maximum hardness was maintained for up to 100 h at 673K in both materials. The hardening and thermal stability in the bulk materials from the milled powders are attributable to dispersion strengthening of Al4C3 particles formed by solid-state reaction during the isothermal heat treatment.

Original languageEnglish
Title of host publicationMaterials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation
EditorsYuri Estrin, Hans Jürgen Maier
Place of PublicationStafa-Zuerich, Switzerland; Enfield, CT
PublisherTrans Tech Publications
Pages428-433
Number of pages6
Volume584-586 PART 1
ISBN (Electronic)9783038131694
ISBN (Print)9780878493753
Publication statusPublished - 2008
Externally publishedYes
Event4th International Conference on Nanomaterials by Severe Plastic Deformation - Goslar, Germany
Duration: 18 Aug 200822 Aug 2008

Publication series

NameMaterials Science Forum
Volume584-586 PART 1
ISSN (Print)02555476

Other

Other4th International Conference on Nanomaterials by Severe Plastic Deformation
CountryGermany
CityGoslar
Period18/08/0822/08/08

Keywords

  • Composite materials
  • ECAP
  • Mechanical milling
  • Powder consolidation
  • Pure aluminium
  • Severe plastic deformation

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