High stability of Zr2Ni nanocrystals in metallic Zr-Cu-Ni glass

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作者：
机构：
[1] Wang, Huan-Rong
[2] Gao, Yu-Lai
[3] Min, Guang-Hui
[4] 1,Ye, Yi-Fu
[5] Chen, Ying
[6] Shi, Zhi-Qiang
[7] Teng, Xin-Ying
来源：
Wang, H.-R. (whr77@yahoo.com.cn) | 1600年 / Elsevier Ltd卷 / 349期
基金：
中国国家自然科学基金;
关键词：
Annealing - Crystallization - Differential scanning calorimetry - Grain size and shape - Nanostructured materials - Nucleation - Supercooling - Transmission electron microscopy - X ray diffraction analysis - Zirconium compounds;
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学科分类号：
摘要：
Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were employed to investigate the origin of high stability of the fcc-Zr2Ni nanocrystals during crystallization of metallic Zr70Cu20Ni10 glass. Isothermal analysis for crystallization kinetics of metallic Zr70Cu20Ni10 glass indicates that the crystallization process is mainly controlled by three-dimensional nucleation and growth with increasing nucleation rate, which has been evidenced by the TEM observations. The fcc-Zr2Ni nanoparticles formed during crystallization of metallic Zr70Cu20Ni10 glass are very stable when annealed in the supercooled liquid region. XRD results seem to illustrate that the grain sizes of the Zr2Ni nanoparticles are independent of the annealing temperature and annealing time. Ni plays an important role for the stability of the fcc-Zr2Ni nanocrystals. The origin of high stability of the fcc-Zr2Ni nanoparticles during crystallization of metallic Zr70Cu20Ni10 glass is also analyzed. © 2000 Elsevier Science B.V. All rights reserved.
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