Microstructure of a rapidly quenched nanocrystalline Hf11Ni89 alloy from X-ray diffraction

Gubicza, Jenő and Ribárik, Gábor and Bakonyi, Imre and Ungár, Tamás (2001) Microstructure of a rapidly quenched nanocrystalline Hf11Ni89 alloy from X-ray diffraction. In: EUROMAT-2001 Conference, 2001, Rimini, Italy.

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Abstract

A rapidly quenched nanocrystalline Hf(11)Ni(89) alloy was produced by melt-spinning. The X-ray phase analysis shows that the as-quenched ribbon consists of mainly nanocrystalline fcc HfNi(5) although a small amount of Ni is also detected. The crystallite size distribution and the dislocation structure of the dominant HfNi(5) phase were determined by a recently developed method of diffraction profile analysis. In this procedure, by assuming spherical shape and log-normal size distribution of crystallites, the measured physical intensity profiles are fitted by the well established ab initio functions of size and strain peak profiles. The anisotropic broadening of peak profiles is accounted for by the dislocation model of the mean square strain in terms of average dislocation contrast factors. It was found that the median and the variance of the crystallite size distribution are 3.3 nm and 0.70, respectively. The dislocation density is 5.7x10(16) m(-2) and the character of dislocations is nearly pure screw.

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