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Indexed by:期刊论文

Date of Publication:2013-08-01

Journal:5th International Symposium on Designing, Processing and Properties of Advanced Engineering Materials (ISAEM)

Included Journals:SCIE、EI、CPCI-S、Scopus

Volume:54

Issue:8

Page Number:1330-1334

ISSN No.:1345-9678

Key Words:amorphous alloy; niobium-based alloy; thermal stability; hydrogen permeation

Abstract:In this work, the Nb-based Nb42Ni40Co18-xZrx (x = 0, 4, 12) and Nb42Ni32Co6Zr12M8 (M = Ta, Ti, Zr) amorphous alloy ribbons were successfully prepared by single roller melt-spinning technique. These amorphous alloys exhibit high thermal stability with the crystallization temperature (T-x) exceeding 850 K. It has been found that T-x of the Nb42Ni40Co18 alloy decreased with Zr addition, while hydrogen permeability increased linearly with Zr content The hydrogen permeability of the Nb42Ni40Co18, Nb42Ni40Co14Zr4, Nb42Ni40Co6Zr12 and Nb42Ni32Co6Zr20 amorphous alloys at 673 K are 0.03 x 10(-8), 0.23 x 10(-8), 0.69 x 10(-8) and 1.40 x 10(-8) mol.m(-1).s(-1).Pa-1/2, respectively. It is noticed that hydrogen permeability of the Nb42Ni32Co6Zr20 alloy is comparable with that of Pd-23%Ag alloy (1.14 x 10(-8)). Meanwhile, permeability of the above mentioned alloy decreased to 60% of the initial value while it still maintains amorphous structure after 24 h long term durability test. Both thermal stability and hydrogen permeability are enhanced by substituting 8 at% Ni with Ta or Ti in the Nb42Ni40Co6Zr12 alloy. The present result indicates that the Nb-based amorphous alloys possess the potential of applying as a kind of hydrogen permeable membrane at high temperature.