Effect of Si on the formation and stability of the icosahedral quasicrystalline phase in Al–Fe–Cr–Ti alloys

Autor:	K. L. Sahoo, I.C. Stone
Rok vydání:	2005
Předmět:	Diffraction Crystallography Differential scanning calorimetry Icosahedral symmetry Transmission electron microscopy Chemistry Phase (matter) Ribbon Thermal decomposition Thermal stability Condensed Matter Physics
Zdroj:	Philosophical Magazine Letters. 85:231-245
ISSN:	1362-3036 0950-0839
DOI:	10.1080/09500830500218470
Popis:	The formation and stability of the quasicrystalline icosahedral (i) phase in melt-spun Al93– x Fe3Cr2Ti2Si x (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 α-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°C in an Al93Fe3Cr2Ti2 ribbon whereas that in an Al92Fe3Cr2Ti2Si1 ribbon was approximately 500°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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0ffdc9e7a1e3a9a6b9e3db1b983a676f https://doi.org/10.1080/09500830500218470 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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