The isothermal and isochronal kinetics of the crystallisation of bulk amorphous Pd40Cu30P20N10

被引：79

作者：

Kempen, ATW ^{[1
]}

Sommer, F ^{[1
]}

Mittemeijer, EJ ^{[1
]}

机构：

[1] Max Planck Inst Met Res, D-70174 Stuttgart, Germany

来源：

ACTA MATERIALIA | 2002年 / 50卷 / 06期

关键词：

kinetics; nucleation; growth; crystallisation; rapid solidification;

D O I：

10.1016/S1359-6454(01)00428-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The amorphous alloy Pd40Cu30P20Ni10 has been produced by water quenching the molten alloy, The kinetics of crystallisation has been measured by means of isothermal and isochronal differential scanning calorimetry. The associated microstructural changes have been analysed using scanning electron microscopy. Special interest has been devoted to the influence of isothermal pre-annealing on subsequent isochronal crystallisation kinetics. By applying appropriate isothermal pre-annealing temperatures, nucleation of the crystalline phases takes place to different extents. Accordingly, the initial state for the subsequent isochronal crystallisation could be changed gradually with respect to the number of pre-existing nuclei. This leads to a gradual change of the mode of nucleation from site saturation to continuous nucleation during the crystallisation. The corresponding change of the kinetic parameters has been used to determine the activation energies of nucleation and growth separately. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：1319 / 1329

页数：11

共 23 条

[1] Granulation, Phase Change, and Microstructure - Kinetics of Phase Change. III [J].