Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 16    No. 5    October 2006

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Effect of oxygen impurity on long-term thermal stability of Zr-based metallic glasses below glass transition temperature
HE Lin (贺 林)1, ZHANG Shuai(张 帅)1
SUN Jun(孙 军)1, ZHANG Chang-jun(张长军)2

1. State Key Laboratory for Mechanical Behavior of Materials, 
Xi’an Jiaotong University, Xi’an 710049, China; 
2. Construction Machinery School, Chang’an University, Xi’an 710049, China

Abstract: Long-term thermal stability of a series of Zr-based metallic glasses with different oxygen contents below their glass transition temperatures was compared based on their deductive continuous-heating-transformation diagrams created by using the corollary of Kissinger analysis method. It is found that the influence of oxygen on the long-term thermal stability of Zr-based metallic glasses exhibits at lower temperature is different from that on their short-term thermal stability presented at higher temperature. For each kind of the Zr-based metallic glasses, there is a critical heating rate, f c, which corresponds to a critical temperature, Tc. As heating rate is smaller than f c and onset devitrification temperature is below Tc, the glass with higher oxygen content will have longer incubation period for onset devitrification. The values of f c and Tc are related with the glasses’ reduced glass transition temperature Trg. The improving effect of oxygen impurity on the long-term thermal stability of Zr-based metallic glasses was discovered.

 

Key words: Zr-based metallic glasses; thermal stability; continuous heating transformation diagram; oxygen impurity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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