Pressure effects on Al89La6Ni5 amorphous alloy crystallization

被引：75

作者：

Zhuang, YX

Jiang, JZ

Zhou, TJ

Rasmussen, H

Gerward, L

Mezouar, M

Crichton, W

Inoue, A

机构：

[1] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

[2] European Synchrotron Radiat Facil, F-38000 Grenoble, France

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 98077, Japan

来源：

APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 25期

关键词：

D O I：

10.1063/1.1332409

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The pressure effect on the crystallization of the Al89La6Ni5 amorphous alloy has been investigated by in situ high-pressure and high-temperature x-ray powder diffraction using synchrotron radiation. The amorphous alloy crystallizes in two steps in the pressure range studied (0-4 GPa). The first process, corresponding to simultaneous precipitation of fcc-Al crystals and the metastable bcc-(AlNi)(11)La-3-like phase, is governed by a eutectic reaction. The second process corresponds to the transformation of a residual amorphous alloy into fcc-Al, Al11La3, Al3Ni, and as yet unidentified phase(s). The applied pressure strongly affects the crystallization processes of the amorphous alloy. Both temperatures first decrease with pressure in the pressure range of 0-1 GPa and then increase with pressure up to 4 GPa. The results are discussed with reference to competing processes between the thermodynamic potential barrier and the diffusion activation energy under pressure. (C) 2000 American Institute of Physics. [S0003- 6951(00)00951-7].

引用

页码：4133 / 4135

页数：3

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