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Patent Searching and Data


Title:
ALLOY WITH METALLIC GLASS AND QUASI-CRYSTALLINE PROPERTIES
Document Type and Number:
WIPO Patent Application WO2002027050
Kind Code:
A9
Abstract:
An alloy is described that is capable of forming a metallic glass at mdoerate cooling rates and exhibits lareg plastic flow at ambient temperature. Preferably, the alloy has a composition of (Zr, hf)a TabTicCudNicAlf, where the composition ranges (in atomic percent) are 45 ≤ a ≤ 70, 3 ≤ b ≤ 7.5, 0 ≤ c ≤ 4, 3 ≤ b+c ≤ 10, 10 ≤ d ≤ 30, 0 &le e ≤ 20, 10 ≤ d+e ≤ 35, and 5 ≤ f ≤ 15. The alloy may be cast into a bulk solid with disordered atomic-scale structure, i.e., a metallic grass, by a variety of techniques including copper mold die casting and planar flow casting. The as-cast amorphous solid has good ductility while retaining all of the characteristic features of known metallic glasses, including a distinct glass transition, a supercooled liquid region, and an absence of long-range atomic order. The alloy may be used to form a composite structure including quasi-crystals embedded in an amorphous matrix. Such a composite quasi-crystalline structure has much higher mechanica l strength than a crystalline structure.

Inventors:
XING LI-QIAN (US)
HUFNAGEL TODD C (US)
RAMESH KALIAT T (US)
Application Number:
US0129778W
Publication Date:
January 16, 2003
Filing Date:
September 25, 2001
Export Citation:
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Assignee:
UNIV JOHNS HOPKINS (US)
XING LI-QIAN (US)
HUFNAGEL TODD C (US)
RAMESH KALIAT T (US)
International Classes:
C22C45/10; (IPC1-7): C22C16/00; C22C45/10
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