Nanocrystal development in Cu47Ti33Zr11Ni8Si1 metallic glass powders

被引：9
|
作者：
Venkataraman, S.
Loeser, W.
Eckert, J.
Gemming, T.
Mickel, C.
Schubert-Bischoff, P.
Wanderka, N.
Schultz, L.
Sordelet, D. J.
机构：
[1] Tech Univ Darmstadt, FG Phys Metallkunde, FB Mat & Geowissensch 11, D-64287 Darmstadt, Germany
[2] IFW Dresden, Inst Met Werkstoffe, D-01171 Dresden, Germany
[3] IFW Dresden, Inst Festkorperforsch, D-01171 Dresden, Germany
[4] IFW Dresden, Inst Festkorperanalyt & Strukturforsch, D-01171 Dresden, Germany
[5] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
[6] Iowa State Univ, Ames Lab, Mat & Engn Phys Program, Ames, IA 50014 USA
[7] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50014 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 415卷 / 1-2期
关键词：
amorphous materials; scanning and electron microscopy; X-ray diffraction; calorimetry;
D O I：
10.1016/j.jallcom.2005.08.009
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The crystallization of gas atomized Cu47Ti33Zr11Ni8Si1 metallic glass powders subjected to annealing at temperatures above and below the glass transition temperature has been studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Nucleation occurs heterogeneously at "quenched-in" nucleation sites at temperature below the glass transition. The resulting nanocrystals are Cu rich. However, upon annealing in the supercooled liquid region, crystallization of Cu51Zr14 nanocrystals occurs homogeneously by a nucleation and growth mechanism. Crystallization in the supercooled liquid is diffusion-control led. The activation energies for the first-order transformation have been calculated using isochronal and isothermal approaches and do not seem to be markedly affected by annealing. (c) 2005 Elsevier B.V. All rights reserved.
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收藏
页码：162 / 169
页数：8
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