Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 1    January 2010

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Correlation between microstructure and thermal dilation behavior of amorphous Fe-Co-Zr-Mo-W-B alloys
ZHANG Ji-teng(张集滕)1, WANG Wei-min(王伟民)1,2, LI Gui-hua(李桂华)1,
MA Hai-jian(马海健)1, QIN Jing-yu(秦敬玉)1, BIAN Xiu-fang(边秀房)

1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education,Shandong University, Ji’nan 250061, China;
2. Key Laboratory of Metastable Materials Science and Technology, Yanshan University,
Qinhuangdao 066004, China

Abstract:The microstructures and thermal properties of Fe61Co9−xZr8Mo5WxB17 (x=0 and 2) formed under different vacuum conditions were investigated by scanning electron microscopy(SEM), X-ray diffractometry(XRD), transmission electron microscopy(TEM), and conventional dilatometry(DIL). The variation of the non-monotonic effects of tungsten content and vacuum conditions on the glass forming ability(GFA) of Fe-based alloys can be drawn in a schematic diagram. The higher the GFA of alloys, the higher the difference between the thermal expansion coefficients of glassy state and crystalline state(Δα), which can be described by the free volume model during dilatometric measurements. Under low and high vacuum conditions, the viscosity and microhardness are improved and the fragility of the Fe-based alloys are decreased by adding tungsten.

 

Key words: glass forming ability; viscosity; fragility; Fe-based alloys

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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