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Oxidation Processes and Phase Changes in Metastable Al-Ti Mechanical Alloys

Published online by Cambridge University Press:  01 February 2011

Xiaoying Zhu ,
Mirko Schoenitz  and
Edward L. Dreizin
Xiaoying Zhu
Affiliation:
New Jersey Institute of Technology, Newark, NJ 07102
Mirko Schoenitz
Affiliation:
New Jersey Institute of Technology, Newark, NJ 07102
Edward L. Dreizin
Affiliation:
New Jersey Institute of Technology, Newark, NJ 07102
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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 Al3Ti 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 Al2O3 films. The effect of the Al2O3 film becomes less noticeable at increased Ti concentrations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 800: Symposium AA – Synthesis, Characterization, and Properties of Energetic/Reactive Nanomaterials , 2003 , AA3.4
Copyright
Copyright © Materials Research Society 2004

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References

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