Evidence for cooling-rate-dependent icosahedral short-range order in a Cu–Zr–Al metallic glass

Autor:	Uta Kühn, Helmut Hermann, Horst Wendrock, Björn Schwarz, Valentin Kokotin
Rok vydání:	2014
Předmět:	Diffraction Crystallography Cooling rate Materials science Amorphous metal Icosahedral symmetry Thermal X-ray crystallography Short range order Analytical chemistry Fraction (chemistry) General Biochemistry Genetics and Molecular Biology
Zdroj:	Journal of Applied Crystallography. 47:1906-1911
ISSN:	1600-5767
DOI:	10.1107/s1600576714021232
Popis:	Samples of Cu47.5Zr47.5Al5metallic glass were prepared at different cooling rate,R. The dependence of the X-ray diffraction patterns onRwas analysed by comparing them with corresponding patterns of computer-simulated models generated at different cooling rates as well. The observed changes in the experimental diffraction patterns are reproduced by the simulations, showing an increasing fraction of icosahedral clusters with decreasing cooling rate. The difference of the fractions of icosahedrally coordinated atoms in mould-cast and rapidly quenched Cu47.5Zr47.5Al5averages to 3 (1)%. Different frozen-in thermal displacements and different density are ruled out as a possible origin for the experimental observations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2c060e64d428fafe95f53d2232c0553a https://doi.org/10.1107/s1600576714021232 Zobrazit plný text záznamu Plný text