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| Composition Optimization of the Zr-Al-Co Bulk Metallic Glasses |
| ZHANG Xinfang; WANG Yingmin; PENG Min; WANG Qing; LI Dejun; DONG Chuang |
| State Key Laboratory of Materials Modification & Department of Materials Engineering; Dalian University of Technology; Dalian 116024 |
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Cite this article:
ZHANG Xinfang; WANG Yingmin; PENG Min; WANG Qing; LI Dejun; DONG Chuang. Composition Optimization of the Zr-Al-Co Bulk Metallic Glasses. Acta Metall Sin, 2004, 40(10): 1103-1103 .
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Abstract Composition optimization for locating the composition zone with the
largest glass forming ability (GFA) in the Zr-Al-Co system is
attempted. The criteria that we have developed are respectively
related to the conduction electron concentration, termed the
e/a-constant criterion, and to the special cluster structure, termed
the e/a-variant criterion. For this system, the two criteria are
incarnated into the e/a-constant line with constant e/a=1.5 and the
(Zr9Co4-Al and (Zr78.5Co21.5)-Al e/a--variant
lines. Bulk metallic glasses (BMGs) are obtained by suction casting for
alloys on the (Al50Co50-Ale/a$--constant line and
Zr9Co4-Al e/a--variant line. On the (Zr9Co4-Al
e/a-variant line, the thermal stability and glass forming ability of
BMGs are increased with increasing e/a ratio. The
Zr53Al23.5Co23.5 BMG with the largest thermal
stability and GFA locates in the intersecting point of the two lines,
its characteristic thermodynamic indices are Tg=783 K,
Tx=849K, Tg/Tm=0.637,
Tg}/Tl=0.590.
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Received: 17 November 2003
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