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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):
6692590
Application Number:
09/960,946
Assignee:
Johns Hopkins University (Baltimore, MD)
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
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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Works referenced in this record:

Deformation behavior of Zr-based bulk nanocrystalline amorphous alloys
journal, February 2000


ZrNbCuNiAl bulk metallic glass matrix composites containing dendritic bcc phase precipitates
journal, April 2002


Ductility of bulk nanocrystalline composites and metallic glasses at room temperature
journal, July 2000


Icosahedral quasicrystalline phase formation in Zr-Al-Ni-Cu glassy alloys by addition of Nb, Ta and V elements
journal, January 2001