Amorphous Alloys on the Base of Zr and their Use

Inactive Publication Date: 2008-08-14
ETH ZZURICH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]It is therefore an object of the present invention to provide an alloy which has good glass-forming ability a

Problems solved by technology

However, most of these alloys cannot be cast into a bulk glassy structure at much lower cooling rates achievable with casting.
Due to the absence of a dislocation mechanism for plastic deformation, they often have a high yield strength and elastic limit.
Exposure to nickel is known to possibly cause allergies.
Therefore these alloys are not well suited for medical applications, in which the alloy can come into cont

Method used

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  • Amorphous Alloys on the Base of Zr and their Use
  • Amorphous Alloys on the Base of Zr and their Use
  • Amorphous Alloys on the Base of Zr and their Use

Examples

Experimental program
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Effect test

example 1

Preparation and Characterization of Amorphous (ZrxCu100−x)80(Fe40Al60)20 Samples

[0098]Several Zr-based Ni-free alloys with composition (ZrxCu100−x)80(Fe40Al60)20 were prepared, where x=60, 62, 64, 66, 68, 72.5, 77, 79, 81, 83 and 85. Ingots were prepared by arc melting the constituents (purity >99.9%) in a titanium-gettered argon atmosphere (99.9999% purity). Using an induction-heating coil, the ingots were remelted in a quartz tube (vacuum ≈10−5 mbar) and injection cast into a copper mold with high-purity argon. Samples were cast into plates with a thickness of 0.5 mm, width of 5 mm and length of 10 mm. To determine the critical casting thickness, some samples were additionally or alternatively cast into various rod- and cone-like shapes with diameters ranging up to 10 mm. Furthermore, several samples were made with a thickness of 1 mm and cross section 1 cm×4 cm. The samples were then, where appropriate, cut into various pieces of length 1 cm and investigated by X-ray diffraction ...

example 2

Preparation of Mixed-Phase Samples

[0113]Samples with a mixed-phase structure were prepared as follows: Fully amorphous samples of Zr58Cu22Fe8Al12 were prepared as in Example 1. The samples were subjected to heat treatment (annealing) at various temperatures for 12 hours. XRD patterns and DTA scans were recorded for the heat-treated samples. FIG. 15 shows XRD patterns of the samples in the as-prepared state (bottom trace) and after annealing. The XRD patterns show typical amorphous structures up to an annealing temperature of 683 K. At higher annealing temperatures, however, clear Bragg peaks arising from an icosahedral phase (I.P.) can be observed. At still higher temperatures, peaks which are typical for a Zr2Fe structure are observed. FIG. 16 shows the XRD pattern of the sample annealed at 708 K for 12 hours in more detail. The indexing indicates the presence of an icosahedral phase with a lattice constant of 0.476 nm. FIG. 17 shows DTA scans of the same samples as in FIG. 15, whi...

example 3

Variations of Composition

[0116]Samples in a widely varying range of compositions were prepared and investigated. The compositions of the following Tables proved to be at least partially amorphous when cast to a plate with thickness of 1 mm (Table 4), 0.5 mm (table 5), or 0.2 mm (Table 6):

TABLE 4Alloys having a partially or fully amorphous structure when cast to athickness of 1 mm.(Zr95Ti5)72Cu13Fe13Al2Zr72Cu12Fe12Al4Zr70Cu13Fe13Al3Sn1Zr70Cu13Fe13Al4Zr70Cu13Fe13Al2Cr2Zr72Cu11Fe11Al6Zr70Cu13Fe13Al2Nb2Zr72Cu11.5Fe11Al5.5Zr70Cu13Fe13Al2Zn2Zr73Cu11Fe11Al5(Zr72Cu13Fe13Al2)98Mo2Zr71Cu11Fe11Al7(Zr72Cu13Fe13Al2)98P2Zr69Cu11Fe11Al9(Zr95Hf5)72Cu13Fe13Al2Zr70Cu10.5Fe10.5Al9Zr70Cu11Fe11Al8Zr70Cu10Fe11Al9Zr71Cu11Fe10Al8Zr70Cu11Fe10Al9(Zr74Cu13Fe13)90Al10Zr69Cu10Fe10Al11Zr72Cu13Fe13Al2Zr69Cu10Fe11Al10(Zr74Cu13Fe13)98Al2Zr70Cu13Fe13Al2Sn2Zr73Cu13Fe13Al1Zr72Cu13Fe13Sn2Zr72Cu13Fe13Al2(Zr74Cu13Fe13)98Sn2Zr71Cu13Fe13Al3

TABLE 5Alloys with a partially or fully amorphous structure when cast to athickness ...

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Abstract

An alloy is disclosed which contains at least four components. The alloy has a bulk structure containing at least one amorphous phase. The alloy composition follows an “80:20 scheme”, i.e., the alloy composition is [(AxD100−x)a(EyG100−y)100−a]100−bZb with the number “a” being approximately 80. Preferably, component A is Zr. The other components D, E, G and, optionally, Z are all different from each other and different from component A. A preferred system is Zr—Cu—Fe—Al. Further disclosed are Cu-free systems of the type Zr—Fe—AI-Pd/Pt. Importantly, the alloy is substantially free of nickel. This makes the alloy especially suitable for medical applications. Methods of preparing such an alloy, uses of the alloy and articles manufactured from the alloy are also disclosed.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an alloy with the features of the preamble of claim 1 or 19, to the use of such an alloy, and to articles manufactured from such an alloy, in particular implants such as endoprostheses.BACKGROUND OF THE INVENTION[0002]A number of alloys may be brought into a glassy state, i.e., an amorphous, non-crystalline structure, by splat cooling at very high cooling rates, e.g., 106 K / s. However, most of these alloys cannot be cast into a bulk glassy structure at much lower cooling rates achievable with casting.[0003]In recent years, many bulk metallic glass-forming liquids have been discovered for which cooling rates of less than 1000 K / s are sufficient for vitrification. For the purposes of this document, a “bulk metallic glass” is to be understood as an alloy which develops an at least partially amorphous structure when cooled from a temperature above the melting point to a temperature below the glass-transition temperature of the...

Claims

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Application Information

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IPC IPC(8): C22C45/10
CPCC22C45/10
Inventor LOFFLER, JORG F.JIN, KAIFENG
Owner ETH ZZURICH
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