The increase in a brittle-to-ductile transition temperature in Fe-Al single crystals

Masaki Tanaka, Keiki Maeno, Kenji Higashida, Masahiro Fujikura, Kohsaku Ushioda

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The effect of aluminium concentration on a brittle-to-ductile transition (BDT) has been investigated in Fe-Al single crystals. The BDT temperatures in Fe-4mass%Al and Fe-8mass%Al crystals with <100> specimen axis were measured by an instrumental falling weight impact tester, indicating that the BDT temperature in Fe-8%Al is higher than that in Fe-4%Al. Twin-twin intersections were seen on fracture surfaces in Fe-8%Al tested at low temperatures, which shows that the intersection was the origin of a brittle fracture. In order to highlight the effect of deformation twinning on the BDT behaviour, specimens with the <110> axis were also employed to suppress the onset of deformation twinning during the impact tests. The BDT temperature in Fe-8%Al was found to be decreased by suppressing deformation twinning, which indicates that deformation twinning is a key mechanism behind increasing the BDT temperature in Fe-Al single crystals. A model to explain the increase in the BDT temperature with aluminium content is also presented.

Original languageEnglish
Pages (from-to)999-1004
Number of pages6
Journalisij international
Volume51
Issue number6
DOIs
Publication statusPublished - Jun 15 2011

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Twinning
Superconducting transition temperature
Single crystals
Aluminum
Brittle fracture
Crystals
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

The increase in a brittle-to-ductile transition temperature in Fe-Al single crystals. / Tanaka, Masaki; Maeno, Keiki; Higashida, Kenji; Fujikura, Masahiro; Ushioda, Kohsaku.

In: isij international, Vol. 51, No. 6, 15.06.2011, p. 999-1004.

Research output: Contribution to journalArticle

Tanaka, Masaki ; Maeno, Keiki ; Higashida, Kenji ; Fujikura, Masahiro ; Ushioda, Kohsaku. / The increase in a brittle-to-ductile transition temperature in Fe-Al single crystals. In: isij international. 2011 ; Vol. 51, No. 6. pp. 999-1004.
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