Effect of Fe content on the thermal stability and dynamic mechanical behavior of NdAlNiCu bulk metallic glasses


Autoria(s): 李维火; 魏炳忱; 孙玉峰; 王育人; Dong YD
Data(s)

2004

Resumo

The dependence of microstructure and thermal stability on Fe content of bulk Nd60Al10Ni10Cu20-xFex (0 less than or equal to x less than or equal to 20) metallic glasses is investigated by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and high-resolution transmission electron micrograph (HRTEM). All samples exhibit typical amorphous feature under the detect limit of XRD, however, HRTEM results show that the microstructure of Nd60Al10Ni10Cu20-xFex alloys changes from a homogeneous amorphous phase to a composite structure consisting of clusters dispersed in amorphous matrix by increasing Fe content. Dynamic mechanical properties of these alloys with controllable microstructure are studied, expressed via storage modulus, the loss modulus and the mechanical damping. The results reveal that the storage modulus of the alloy without Fe added shows a distinct decrease due to the main a relaxation. This decrease weakens and begins at a higher temperature with increasing Fe content. The mechanism of the effect of Fe addition on the microstructure and thermal stability in this system is discussed in terms of thermodynamics viewpoints. (C) 2004 Elsevier B.V. All rights reserved.

Identificador

http://dspace.imech.ac.cn/handle/311007/33747

http://www.irgrid.ac.cn/handle/1471x/2722

Idioma(s)

英语

Fonte

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing.2004,385(1-2):397-401

Palavras-Chave #Bulk Metallic Glass #Glass Transition #Crystallization #Dynamic Mechanical Thermal Analysis #Magnetic-Properties #Internal-Friction #Amorphous-Alloys #Crystallization #Evolution #Viscosity #Liquid #Phase #Range #Flow
Tipo

期刊论文