The effect of Zr addition in glass forming ability of Ni-Nb alloy system

被引：35
|
作者：
Chang, H. J.
Park, E. S.
Jung, Y. S.
Kim, M. K.
Kim, D. H.
机构：
[1] Yonsei Univ, Dept Met Engn, Ctr Noncrystalline Mat, Seoul 120749, South Korea
[2] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Beamline Dept, Pohang 790784, South Korea
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2007年 / 434卷 / SPEC. ISS.期
关键词：
Ni-Nb-based alloy; bulk metallic glass; EXAFS; chemical inhomogeneity;
D O I：
10.1016/j.jallcom.2006.08.292
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 effect of Zr addition on glass forming ability (GFA) of Ni-Nb alloys has been investigated. Ni60Nb40-xZrx (x = 0-40) alloys were prepared by melt-spinning and injection-casting. Crystallization behavior of the alloys was studied by differential scanning calorimetry (DSC), differential thermal analyzer (DTA) and X-ray diffractometry (XRD). The GFA increased with the addition of Zr, thus, a rod with the diameter of 2 mm was obtained in Ni60Nb30Zr10 which has the highest reduced glass transition T-rg value of 0.619 among the alloys investigated. When Zr content is more than 10 at. %, the GFA deteriorated significantly. The atomic structure of Ni-Nb-Zr alloys investigated by means of extended X-ray absorption fine structure (EXAFS), indicated presence of chemical inhomogeneity in the amorphous structure due to the positive mixing enthalpy between Zr and Nb. (C) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：156 / 159
页数：4
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