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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 2    April 2001

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Nanocrystallization of Al80Ni6Y8Co4Cu2 amorphous alloy
BIAN Zan(边 赞)1, SUN Yu-feng(孙玉峰)2, HE Guo(何 国)1, CHEN Guo-liang(陈国良)1

1. State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing;
2. School of Materials Science and Technology,
University of Science and Technology Beijing,Beijing 100083, P.R.China

Abstract:Nanoscale α(Al) phase with a size of 15 nm was precipitated from Al80Ni6Y8Co4Cu2 amorphous ribbons after annealing. The microhardness increases with increasing the crystallization volume fraction of nanoscale α(Al)phase. The combination effect of alloy strengthening and dispersion strengthening is main reason for the increase of microhardness. The formation of intermetallic compound (Al3Ni) with a small volume fraction leads to the decrease of microhardness resulting from the depletion of the solute elements in the residual amorphous matrix and the weakening of alloy strengthening. With increasing the volume fraction of intermetallic compound, microhardness increases again due to dispersion strengthening of nanoscale intermetallic compound.

 

Key words: nanoscale α(Al) particle; alloy strengthening; dispersion strengthening; microhardness

ISSN 1672-7029
CN 43-1423/U

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