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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Formation and crystallization of bulk Pd82Si18 amorphous alloys
PU Jian(蒲 建), WANG Jian-feng(王敬丰),
XIAO Jian-zhong(肖建中), CUI Kun(崔 昆)

State Key Lab of Plastic forming Simulation and Die & Mould Technology, Huazhong University of Science & Technology,
Wuhan 430074,China

Abstract:Bulk amorphous Pd82Si18 alloy with the largest diameter of 8mm was prepared by water quenching the molten alloy with flux medium in a quartz tube. The calculation result indicates that the bulk Pd82Si18amorphous alloys have a low critical cooling rate (Rc) of 4.589K/s or less. The experimental results show that purifying melt may improve glass forming ability(GFA) of undercooled melt, while liquid phase separation (LPS) of undercooled melt will decrease its GFA. There are some differences in crystallization experiments between bulk metallic glass and amorphous ribbons of Pd82Si18 alloys. These include the numbers of exothermic peak, glass transition temperature Tg, crystallization temperature Tx, region of undercooling liquid (ΔT=TxTg) respectively. The links of cooling rates of melt and crystallization of Pd82Si18 amorphous alloys are explored.

 

Key words: bulk amorphous alloys; Pd82Si18; glass forming ability; undercooling; critical cooling rate

ISSN 1672-7029
CN 43-1423/U

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