Fabrication of an r-Al2Ti intermetallic matrix composite reinforced with α-Al2O3 ceramic by discontinuous mechanical milling for thermite reaction |
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Authors: | AMosleh MEhteshamzadeh RTaherzadeh Mousavian |
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Institution: | 1. Department of Materials Science and Engineering, Shahid Bahonar University of Kerman, Kerman 76169-14111, Iran 2. Department of Metal urgy, Zanjan Branch, Islamic Azad University, Zanjan 45156-58145, Iran |
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Abstract: | In this study, a powder mixture with an Al/TiO2 molar ratio of 10/3 was used to form an r-Al2Ti intermetallic matrix composite (IMC) reinforced with α-Al2O3 ceramic by a novel milling technique, called discontinuous mechanical milling (DMM) instead of milling and ignition of the produced thermite. The results of energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) of samples with varying milling time indicate that this fabrication process requires considerable mechanical energy. It is shown that Al2Ti-Al2O3 IMC with small grain size was produced by DMM after 15 h of ball milling. Peaks for γ-TiAl as well as Al2Ti and Al2O3 are observed in XRD patterns after DMM followed by heat treatment. The microhardness of the DMM-treated composite produced after heat treatment was higher than Hv 700. |
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Keywords: | composite materials intermetallics alumina titanium aluminide ball milling thermite reaction process |
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