A nanocrystalline fcc phase via devitrification of a Ni36Fe32Ta7Si8B17 amorphous alloy

被引：5
|
作者：
Rizzi, P [1 ]
Baricco, M [1 ]
Riontino, G [1 ]
Battezzati, L [1 ]
机构：
[1] Univ Turin, Dipartimento Chim Inorgan Chim Fis & Chim Mat & U, INFM, I-10125 Turin, Italy
来源：
NANOSTRUCTURED MATERIALS | 1999年 / 11卷 / 06期
关键词：
D O I：
10.1016/S0965-9773(99)00363-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Various multicomponent alloys containing Ni-Fe-Si-B and refractory metals have been rapidly solidifed in order to check their tendency to produce glassy phases and their devitrification behaviour has been studied. Among these a Ni36Fe32Ta7Si8B17 alloy presents primary crystallization with production of fee nanocrystals embedded in the glassy matrix. The kinetics of the transformation is determined at 530 degrees C showing that it consists in two steps: fast nucleation and growth of nanocrystals plus homogenization of the remaining matrix with crystal coarsening. Evidence based on TEM observations, XRD patterns and DSC experiments, are reported in favour of a homogeneous mechanism of nucleation. Faceting of nanocrystals is observed for the first time in such transformations and is attributed to a stress effect on the particles. (C)1999 Acta Metallurgica Inc.
引用
收藏
页码：747 / 755
页数：9
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