Oxidation processes and phase changes in metastable Al-Ti mechanical alloys

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Abstract

Oxidation of Al-Ti mechanical alloys with Ti concentrations from 5 to 25 at% was studied and compared to the oxidation of Al powders using thermal analysis in the temperature range of 300 - 1500 °C in oxygen. Differential scanning calorimetry (DSC) and differential thermal analysis (DTA) with simultaneous thermo-gravimetric analysis (TGA) were used to monitor phase changes and oxidation reactions. Intermediate reaction products were recovered at different temperatures and analyzed using x-ray diffraction (XRD) and scanning electron microscopy (SEM). Oxidation of all samples occurred stepwise. The temperature of the first oxidation step for Al-Ti mechanical alloys correlates with the exothermic formation of the Al-Ti intermetallic at T>700 °C and has a higher rate and greater degree of oxidation than the first oxidation step observed for pure aluminum. The second and third oxidation steps in mechanical alloys and aluminum occur at higher temperatures and both appear to be controlled by changes in the permeability of the Al2O 3 films. The effect of the Al2O3 film becomes less noticeable at increased Ti concentrations.

Original languageEnglish (US)
Pages (from-to)99-104
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume800
DOIs
StatePublished - 2003
EventSynthesis, Characterization and Properties of Energetic/Reactive Nanomaterials - Boston, MA., United States
Duration: Dec 1 2003Dec 4 2003

All Science Journal Classification (ASJC) codes

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

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