Crystallization behavior of the Zr61Al7.5Cu17.5Ni10Si4 amorphous alloy

Jang  JSC; Chen  YW; Chang  LJChen  GJ

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Crystallization behavior of the Zr61Al7.5Cu17.5Ni10Si4 amorphous alloy

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The ribbons of amorphous Zr61Al7.5Cu17.5Ni10Si4 alloy were studied by means of differential scanning calorimetry (DSC), X-ray diffractometry (XRD), high-temperature optical microscope and transmission electron microscopy (TEM). The activation energy for such the crystallization of the amorphous phase was about 360 and 370 kJ mole(-1) calculated by Kissinger and Avrami plots, respectively. Kinetics for the crystallization was analyzed by means of Johnson-Mehl-Avrami equation and discussed regarding to the value of Avrami exponent. The average value of the Avrami exponent n was measured about 2.43 at the range from 698 to 713 K. In addition, the cube of crystal size as a function of isothermally annealing time presents a linear relationship for the Zr61Al7.5Cu17.5Ni10Si4 alloy. When the Zr61Al7.5Cu17.5Ni10Si4 alloy was isothermally annealed at 698 K, a Zr2Cu crystal with an average size of 105 nm was first observed at the early stage (30 crystallization) of crystallization. In addition, both nano-crystals of ordered fee ZrCu (similar to100 nm) and ordered fee Zr3Al (similar to30 nm) were observed to precipitate from the amorphous matrix upon the middle stage (50 crystallization) of crystallization. (C) 2004 Elsevier B.V All rights reserved.

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来源
《Materials Chemistry and Physics》 |2004年第1期|227-233|共7页
作者
Jang JSC; Chen YW; Chang LJChen GJ;
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作者单位

I SHOU Univ, Dept Mat Sci & Engn, Kaohsiung, Taiwan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
amorphous alloy; zirconium-based alloy; crystallization behavior; thermal properties; SUPERCOOLED LIQUID REGION; GLASS-FORMING ABILITY; METALLIC GLASSES; TRANSITION TEMPERATURE; GOOD DUCTILITY; HIGH-STRENGTH; CU ALLOYS; NI; KINETICS; CO;

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Crystallization behavior of the Zr61Al7.5Cu17.5Ni10Si4 amorphous alloy

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