Thermodynamic analysis of nanocrystalline and amorphous NbCr2 intermetallic produced by mechanical alloying followed by hot pressing

Autor:	Shiqiang Lu, Kelu Wang, Xiao-wu Nie
Rok vydání:	2009
Předmět:	Materials science Scanning electron microscope Metallurgy Metals and Alloys Intermetallic Niobium chemistry.chemical_element Condensed Matter Physics Hot pressing Nanocrystalline material Amorphous solid Chromium chemistry Mechanics of Materials Ball mill
Zdroj:	Metal Science and Heat Treatment. 51:563-566
ISSN:	1573-8973 0026-0673
DOI:	10.1007/s11041-010-9211-z
Popis:	Thermodynamic analysis of NbCr2 intermetallic obtained by mechanical alloying and subsequent hot pressing is performed. High-purity powders of niobium and chromium in molar proportion of 1 : 2 are treated in a ball mill for up to 100 h. Then the powders are sintered in vacuum (1250°C, 0.5 h) at a pressure of 45 MPa. This yields massive nanocrystalline and/or amorphous NbCr2 intermetallic. The transformation of crystalline NbCr2 into nanocrystalline or amorphous intermetallic is studied using methods of x-ray diffractometry or scanning electron microscopy. The semi-empirical Miedema model is used to compute the chemical driving force of formation of the amorphous and crystalline phases.
Databáze:	OpenAIRE
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