Effect of oxygen impurity on crystallization of an undercooled bulk glass forming Zr-Ti-Cu-Ni-Al alloy

被引：343

作者：

Lin, XH ^{[1
]}

Johnson, WL ^{[1
]}

Rhim, WK ^{[1
]}

机构：

[1] CALTECH,JET PROP LAB,PASADENA,CA 91109

来源：

MATERIALS TRANSACTIONS JIM | 1997年 / 38卷 / 05期

关键词：

bulk metallic glass; crystallization; impurity; undercooling; overheating; homogeneous nucleation; heterogeneous nucleation; electrostatic levitation; time-temperature-transformation diagram; critical cooling rate;

D O I：

10.2320/matertrans1989.38.473

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High vacuum, containerless, electrostatic levitation process has been used to study the undercooling and crystallization kinetics of a bulk glass forming Zr-Ti-Cu-Ni-Al alloy. The oxygen impurity level in the alloy has been found to play a crucial role in the crystallization kinetics of the undercooled melt. Overheating the melt above a critical threshold temperature results in enhancement subsequent undercooling. This crucial threshold temperature is found to be a function of the overall oxygen content of the alloy direct measurement of the time-temperature-trans formation (TTT) diagram for crystallization of the undercooled melt made following initial overheating above the threshold temperature show a strong dependence on overall oxygen concentration. An explanation of these observations is proposed.

引用

页码：473 / 477

页数：5

共 16 条

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