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Dendritic microstructure in the metallic glass matrix composite Zr56Ti14Nb5Cu7Ni6Be12

Huang, Y.-L; Bracchi, A.; Niermann, T.; Seibt, M.; Danilov, D.; Nestler, Britta; Schneider, S.

Quantitative analytical electron microscopy study of dopant distribution in the rnicrostructure of selected Nd-alpha-sialon samples revealed the presence of relatively large amounts of glassy phase at quadruple pockets, which exhibited a common composition similar to a melilite solution. Al segregants were depleted from adjacent grain boundaries to satisfy the "stoichiometry" of such glass. Existence of this glass results in significant deviation of the Nd-alpha-sialon composition from the expected values, which shifts the alpha-beta-sialon phase boundary. Only extra Nd2O3 additives enable a monolithic alpha-sialon microstructure. The absence of similar glass in Yb-alpha-sialon materials keeps the phase relations from such deviations.

Zugehörige Institution(en) am KIT Institut für Zuverlässigkeit von Bauteilen und Systemen (IZBS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2005
Sprache Englisch
Identifikator ISSN: 1359-6462, 1872-8456
KITopen ID: 1000018703
Erschienen in Scripta materialia
Band 53
Heft 1
Seiten 93-97
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