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| E/A-CONSTANT PHENOMENA IN TI-ZR-NI-CU GLASS-FORMING SYSTEM |
| QIANG Jianbing; HUANG Huogen; WANG Qing;XIA Junhai; DONG Chuang |
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Cite this article:
QIANG Jianbing; HUANG Huogen; WANG Qing; XIA Junhai; DONG Chuang. E/A-CONSTANT PHENOMENA IN TI-ZR-NI-CU GLASS-FORMING SYSTEM. Acta Metall Sin, 2006, 42(6): 561-564 .
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Abstract An e/a-constant rule shows that the composition of the bulk metallic glass formers is always located in an e/a constant line or plane defined by the glass-related phases. Following this criteria, a series of alloys, with e/a (i.e. valence electron per atom) value of 1.2 and Ra (average atomic size) of 0.1474 nm, are designed in Ti-Zr-Ni-Cu system basing on an optimized quasicrystals-forming composition Ti40Zr40Ni20, then the alloy rods with diameter of 3mm are fabricated by the conventional suction casting method, the experimental results showed that a bulk glassy can be obtained in the vicinity of Ti12Zr55Ni13Cu20, and at the composition of Ti3Zr60Ni12Cu25 and Zr60Ni10Cu30, the another glass-related phase, tetragonal tI-Zr2Cu phase, is formed as the exclusive phase in the alloys. Electronic and atomic structural analysis revealed that the above quacrystals, bulk metallic glass and the tI-Zr2Cu phase are a group of electronic compounds sharing the nearly same e/a value, meanwhile, the local atomic structure of these phases are also correlative with each other, And a clearly e/a-constant phenomenon can be found in the compositional diagram, indicating that the e/a-constant criteria is valid for Ti-Zr-Ni-Cu glass forming system. Meanwhile, the structural correlations between the icosahedron and truncated octahedron clusters, which can be considered as an structural model to describe the polymorphous transformation from quacrystals or metallic glass to Zr2Cu-type phase，have been revealed in the present work.
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Received: 23 September 2005
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