Sahoo, K L and Stone, I C (2005) Effect of Si on the formation and stability of the icosahedral quasicrystalline phase in Al-Fe-Cr-Ti alloys. Philosophical Magazine Letters Online ISSN 1362-3036, 85 (5). pp. 231-245.
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The formation and stability of the quasicrystalline icosahedral (i) phase in melt-spun Al93-xFe3Cr2Ti2Six (x = 0-5) ribbons are reported. Samples were characterized by X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. Primitive (P-type) ordered i phase particles were found to be homogeneously distributed in an fcc alpha-Al matrix in the as-melt-spun ribbons. The size of the i phase particles decreased and their thermal stability increased with increasing substitution of Al by Si. The i phase had a decomposition temperature of approximately 480 degrees C in an Al93Fe3Cr2Ti2 ribbon whereas that in an Al92Fe3Cr2Ti2Si1 ribbon was approximately 500 degrees C. The i phase particles are resistant to coarsening prior to decomposition into crystalline phases. The presence of a small quantity of Si ( up to 1.0 at.%) is beneficial to both the thermal stability and the hardness of nanoquasicrystalline Al - Fe - Cr - Ti alloys.
|Official URL/DOI:||DOI: 10.1080/09500830500218470|
|Uncontrolled Keywords:||Silicion, icosahedral quasicrystalline phase, Al-Fe-Cr-Ti alloys|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||14 Jul 2011 17:04|
|Last Modified:||08 Feb 2012 17:08|
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