Impact Toughness Of Al-Li System Alloys At Low Temperatures

Toshiro Kobayashi, Mitsuo Niinomi, Kimio Degawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Al-2.7%Li-1.2%Gu-0.8%Mg~0.1%Zr wrought alloys are heat treated to improve their impact toughness at lower temperatures, although a number of laminated cracks form in the vertical direction to the fracture surface. Low melting point elements, K and Na, are found on the fractured surface by Auger spectroscopy. The maximum local temperature rise at crack tips under dynamic loading is calculated to be 90 K. The temperature modified from this local temperature rise is equivalent to the melting point of the metal phase having lowest melting point and the lowest temperature for starting impact toughness weakening. The low melting point metal phase probably causes liquid embrittlement at grain boundaries.

Original languageEnglish
Pages (from-to)816-823
Number of pages8
Journaljournal of japan institute of light metals
Volume37
Issue number12
DOIs
Publication statusPublished - 1987

Keywords

  • Li alloy
  • laminated crack low melting point metals impact toughness low temperature toughness temperature rise at the crack tip Al~

ASJC Scopus subject areas

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

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