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Title: Alloy with metallic glass and quasi-crystalline properties

Abstract

An alloy is described that is capable of forming a metallic glass at moderate cooling rates and exhibits large plastic flow at ambient temperature. Preferably, the alloy has a composition of (Zr, Hf).sub.a Ta.sub.b Ti.sub.c Cu.sub.d Ni.sub.e Al.sub.f, where the composition ranges (in atomic percent) are 45.ltoreq.a.ltoreq.70, 3.ltoreq.b.ltoreq.7.5, 0.ltoreq.c.ltoreq.4, 3.ltoreq.b+c.ltoreq.10, 10.ltoreq.d.ltoreq.30, 0.ltoreq.e.ltoreq.20, 10.ltoreq.d+e.ltoreq.35, and 5.ltoreq.f.ltoreq.15. The alloy may be cast into a bulk solid with disordered atomic-scale structure, i.e., a metallic glass, 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 mechanical strength than a crystalline structure.

Inventors:
; ;
Issue Date:
Research Org.:
Johns Hopkins University, Baltimore, MD (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174730
Patent Number(s):
6,692,590
Application Number:
09/960,946
Assignee:
Johns Hopkins University (Baltimore, MD) OSTI
DOE Contract Number:  
FG02-98ER45699
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Xing, Li-Qian, Hufnagel, Todd C., and Ramesh, Kaliat T. Alloy with metallic glass and quasi-crystalline properties. United States: N. p., 2004. Web.
Xing, Li-Qian, Hufnagel, Todd C., & Ramesh, Kaliat T. Alloy with metallic glass and quasi-crystalline properties. United States.
Xing, Li-Qian, Hufnagel, Todd C., and Ramesh, Kaliat T. Tue . "Alloy with metallic glass and quasi-crystalline properties". United States. https://www.osti.gov/servlets/purl/1174730.
@article{osti_1174730,
title = {Alloy with metallic glass and quasi-crystalline properties},
author = {Xing, Li-Qian and Hufnagel, Todd C. and Ramesh, Kaliat T.},
abstractNote = {An alloy is described that is capable of forming a metallic glass at moderate cooling rates and exhibits large plastic flow at ambient temperature. Preferably, the alloy has a composition of (Zr, Hf).sub.a Ta.sub.b Ti.sub.c Cu.sub.d Ni.sub.e Al.sub.f, where the composition ranges (in atomic percent) are 45.ltoreq.a.ltoreq.70, 3.ltoreq.b.ltoreq.7.5, 0.ltoreq.c.ltoreq.4, 3.ltoreq.b+c.ltoreq.10, 10.ltoreq.d.ltoreq.30, 0.ltoreq.e.ltoreq.20, 10.ltoreq.d+e.ltoreq.35, and 5.ltoreq.f.ltoreq.15. The alloy may be cast into a bulk solid with disordered atomic-scale structure, i.e., a metallic glass, 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 mechanical strength than a crystalline structure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {2}
}

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