Overheating threshold and its effect on time-temperature-transformation diagrams of zirconium based bulk metallic glasses

被引：63

作者：

Mukherjee, S ^{[1
]}

Zhou, Z ^{[1
]}

Schroers, J ^{[1
]}

Johnson, WL ^{[1
]}

Rhim, WK ^{[1
]}

机构：

[1] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 24期

关键词：

D O I：

10.1063/1.1763219

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A pronounced effect of overheating is observed on the crystallization behavior for the three zirconium-based bulk metallic glasses: Zr41.2Ti13.8Cu12.5Ni10Be22.5, Zr57Cu15.4Ni12.6Al10Nb5, and Zr52.5Cu17.9Ni14.6Al10Ti5. A threshold overheating temperature is found for each of the three alloys, above which there is a drastic increase in the undercooling level and the crystallization times. Time-temperature-transformation (TTT) diagrams were measured for the three alloys by overheating above their respective threshold temperatures. The TTT curves for Zr41.2Ti13.8Cu12.5Ni10Be22.5 and Zr57Cu15.4Ni12.6Al10Nb5 are very similar in shape and scale with their respective glass transition temperatures, suggesting that system-specific properties do not play a crucial role in defining crystallization kinetics in these alloys. The critical cooling rates to vitrify the alloys as determined from the TTT curves are about 2 K/s for Zr41.2Ti13.8Cu12.5Ni10Be22.5 and 10 K/s for Zr57Cu15.4Ni12.6Al10Nb5. The measurements were conducted in a high-vacuum electrostatic levitator. (C) 2004 American Institute of Physics.

引用

页码：5010 / 5012

页数：3

共 17 条

[1]

*ASM INT, 1990, MET HDB, V2, P667

[2] KINETICS OF CRYSTAL NUCLEATION AND GROWTH IN PD40NI40P20 GLASS [J].