Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2001-10-30
2004-01-27
Wyszomierski, George (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S403000, C420S422000, C420S423000, C164S474000
Reexamination Certificate
active
06682611
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to improved Zr-based bulk metallic glasses and more particularly to Zr-based bulk metallic glasses (BMG) prepared with low purity of zirconium under a low vacuum by introducing a small amount of yttrium into the alloy mix.
BACKGROUND OF INVENTION
Recently, many bulk metallic glass forming alloys, such as ZrAlNiCu and ZrTiCuNiBe have been developed. The new types of metallic glasses with excellent glass forming ability (GFA) promise to allow the production of large-scale bulk material by conventional casting processes at a low cooling rate. However, high vacuum (at least 10
−3
Pa), high purity of constituent elements (the purity of zirconium is at least 99.99 at %, oxygen content should be less than 250 ppm) and high purity of argon gas are necessary for fabrication of the Zr-based bulk metallic glasses (BMGs), even traces of oxygen impurities and other impurities, e.g., carbon, induce the heterogeneous nucleation and reduce the GFA drastically. The strict processing makes the cost of Zr-based BMGs high, and limits its wide application.
Accordingly, an inexpensive reliable method is needed which makes it possible to form Zr-based bulk metallic glasses utilizing low purity Zr and low vacuum.
SUMMARY OF INVENTION
The present invention is directed to a Zr-based BMG having a small concentration of Y added thereto which can be prepared with a low purity of zirconium under a low. More particularly, the present invention is directed to Zr—Al—Ni—Cu and Zr—Ti—Ni—Cu—Be alloys containing a Y additive.
In one embodiment of the invention 2-4 at % yttrium is added to the Zr-based alloy composition.
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Pan Ming Xiang
Wang Wei Ilua
Zhang Yong
Zhao De Qian
Christie Parker & Hale LLP
Liquid Metal Technologies, Inc.
Wyszomierski George
LandOfFree
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